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At least 181 records · Page 10
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Precise measurements of branching fractions for $ {\mathrm{D}}_{\mathrm{s}}^{+} $ meson decays to two pseudoscalar mesons

We measure the branching fractions for seven $D$$^{+}_{s}$ two-body decays to pseudo-scalar mesons, by analyzing data collected at √s = 4.178 ~ 4.226 GeV with the BESIII detector at the BEPCII collider. The branching fractions are determined to be $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}_s^{+}\to {K}^{+}\eta \hbox{'}\right)=\left(2.68\pm 0.17\pm 0.17\pm 0.08\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to \eta \hbox{'}{\pi}^{+}\right)=\left(37.8\pm 0.4\pm 2.1\pm 1.2\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}\eta \right)=\left(1.62\pm 0.10\pm 0.03\pm 0.05\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to \eta {\pi}^{+}\right)=\left(17.41\pm 0.18\pm 0.27\pm 0.54\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}{K}_S^0\right)=\left(15.02\pm 0.10\pm 0.27\pm 0.47\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}_S^0{\pi}^{+}\right)=\left(1.109\pm 0.034\pm 0.023\pm 0.035\right)\times {10}^{-3},\\ {}\mathcal{B}\left({D}_s^{+}\to {K}^{+}{\pi}^0\right)=\left(0.748\pm 0.049\pm 0.018\pm 0.035\right)\times {10}^{-3},\end{array}} $$ B D s + → K + η ' = 2.68 ± 0.17 ± 0.17 ± 0.08 × 10 - 3 , B D s + → η ' π + = 37.8 ± 0.4 ± 2.1 ± 1.2 × 10 - 3 , B D s + → K + η = 1.62 ± 0.10 ± 0.03 ± 0.05 × 10 - 3 , B D s + → η π + = 17.41 ± 0.18 ± 0.27 ± 0.54 × 10 - 3 , B D s + → K + K S 0 = 15.02 ± 0.10 ± 0.27 ± 0.47 × 10 - 3 , B D s + → K S 0 π + = 1.109 ± 0.034 ± 0.023 ± 0.035 × 10 - 3 , B D s + → K + π 0 = 0.748 ± 0.049 ± 0.018 ± 0.035 × 10 - 3 , where the first uncertainties are statistical, the second are systematic, and the third are from external input branching fraction of the normalization mode $ {D}_s^{+} $ D s + → K + K - π + . Precision of our measurements is significantly improved compared with that of the current world average values.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2020

Materials Data on AcPm3 by Materials Project

AcPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to twelve Pm atoms to form AcPm12 cuboctahedra that share corners with six equivalent AcPm12 cuboctahedra, corners with twelve PmAc4Pm8 cuboctahedra, edges with eighteen PmAc4Pm8 cuboctahedra, faces with eight equivalent AcPm12 cuboctahedra, and faces with twelve PmAc4Pm8 cuboctahedra. There are six shorter (3.75 Å) and six longer (3.78 Å) Ac–Pm bond lengths. There are three inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.67–3.84 Å. In the second Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.67–3.84 Å. In the third Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are one shorter (3.67 Å) and one longer (3.84 Å) Pm–Pm bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsPm by Materials Project

CsPm is Copper-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are three inequivalent Cs sites. In the first Cs site, Cs is bonded to six equivalent Cs and six equivalent Pm atoms to form CsCs6Pm6 cuboctahedra that share corners with twelve CsCs6Pm6 cuboctahedra, edges with twelve CsCs6Pm6 cuboctahedra, edges with twelve equivalent PmCs6Pm6 cuboctahedra, faces with six equivalent CsCs6Pm6 cuboctahedra, and faces with twelve equivalent PmCs6Pm6 cuboctahedra. All Cs–Cs bond lengths are 3.89 Å. All Cs–Pm bond lengths are 4.45 Å. In the second Cs site, Cs is bonded to six equivalent Cs and six Pm atoms to form CsCs6Pm6 cuboctahedra that share corners with five equivalent PmCs6Pm10 cuboctahedra, corners with twelve CsCs6Pm6 cuboctahedra, edges with ten PmCs6Pm6 cuboctahedra, edges with twelve CsCs6Pm6 cuboctahedra, faces with six equivalent CsCs6Pm6 cuboctahedra, and faces with fifteen PmCs6Pm6 cuboctahedra. All Cs–Cs bond lengths are 3.89 Å. All Cs–Pm bond lengths are 4.45 Å. In the third Cs site, Cs is bonded to six equivalent Cs and six Pm atoms to form CsCs6Pm6 cuboctahedra that share corners with five equivalent PmCs6Pm10 cuboctahedra, corners with twelve CsCs6Pm6 cuboctahedra, edges with ten PmCs6Pm6 cuboctahedra, edges with twelve CsCs6Pm6 cuboctahedra, faces with six equivalent CsCs6Pm6 cuboctahedra, and faces with fifteen PmCs6Pm6 cuboctahedra. All Cs–Cs bond lengths are 3.89 Å. All Cs–Pm bond lengths are 4.45 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to six Cs and six equivalent Pm atoms to form PmCs6Pm6 cuboctahedra that share corners with twelve PmCs6Pm6 cuboctahedra, edges with twelve CsCs6Pm6 cuboctahedra, edges with twelve PmCs6Pm6 cuboctahedra, faces with six equivalent PmCs6Pm6 cuboctahedra, and faces with twelve CsCs6Pm6 cuboctahedra. All Pm–Pm bond lengths are 3.89 Å. In the second Pm site, Pm is bonded to six Cs and ten equivalent Pm atoms to form PmCs6Pm10 cuboctahedra that share corners with ten CsCs6Pm6 cuboctahedra, corners with twelve PmCs6Pm6 cuboctahedra, edges with eight CsCs6Pm6 cuboctahedra, edges with sixteen PmCs6Pm6 cuboctahedra, faces with sixteen equivalent PmCs6Pm10 cuboctahedra, and faces with eighteen CsCs6Pm6 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.89–7.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Measurements of the branching fractions of ${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$, ${\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}$, and ${\Xi }_{c}^{+}\to {\Xi }^{0}{K}+$ at Belle and Belle II

Using 983.0 fb −1 and 427.9 fb −1 data samples collected with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric energy e + e − colliders, respectively, we present studies of the Cabibbo-favored ${\Xi }_{c}^{+}$ decays ${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$ and ${\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}$, and the singly Cabibbo-suppressed decay ${\Xi }_{c}^{+}\to {\Xi }^{0}{K}^{+}$. The ratios of branching fractions of ${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$ and ${\Xi }_{c}^{+}\to {\Xi }^{0}{K}^{+}$ relative to that of ${\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ are measured for the first time, while the ratio $\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+})/\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+})$ is also determined and improved by an order of magnitude in precision. The measured branching fraction ratios are $\begin{array}{c}\frac{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}\right)}{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}\right)}=0.067\pm 0.007\pm 0.003,\\ \frac{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}\right)}{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}\right)}=0.251\pm 0.005\pm 0.010,\\ \frac{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Xi }^{0}{K}^{+}\right)}{\mathcal{B}\left({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}\right)}=0.017\pm 0.003\pm 0.001.\end{array}$ Additionally, the ratio $\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{0}{K}^{+})/\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+})$ is measured to be 0.068 ± 0.010 ± 0.004. Here, the first and second uncertainties are statistical and systematic, respectively. Multiplying the ratios by the branching fraction of the normalization mode, $\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+})=(2.9\pm 1.3)%$, we obtain the following absolute branching fractions $\begin{array}{c}\mathcal{B}({\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0})=(0.194\pm 0.021\pm 0.009\pm 0.087)\text{%},\\ \mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+})=(0.728\pm 0.014\pm 0.027\pm 0.326)\text{%},\\ \mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{0}{K}^{+})=(0.049\pm 0.007\pm 0.003\pm 0.022)\text{%},\end{array}$ where the third uncertainties are from $\mathcal{B}({\Xi }_{c}^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+})$.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2021

Measurements of branching fractions and asymmetry parameters of $ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $, $ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $, and $ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $ decays at Belle

Using a data sample of 980 fb -1 collected with the Belle detector at the KEKB asymmetric-energy e + e - collider, we study the processes of ${\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}$, ${\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}$, and ${\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}$ for the first time. The relative branching ratios to the normalization mode of ${\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}$ are measured to be ${\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}}$ where the uncertainties are statistical and systematic, respectively. We obtain ${\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}}$ where the uncertainties are statistical, systematic, and from $\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)$, respectively. The asymmetry parameters $\alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)$ and $\alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)$ are 0.15 ± 0.22(stat.) ± 0.04(syst.) and -0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2021

Observation of new excited ${B} ^0_{s}$ states

A structure is observed in the ${B} ^{\pm }{K} ^{\mp }$ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9$\,\text {fb} ^{-1}$. The structure is interpreted as the result of overlapping excited ${B} ^0_{s}$ states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to ${B} ^{\pm }{K} ^{\mp }$, are determined to be $\begin{aligned} m_1&= 6063.5 \pm 1.2 \text { (stat)} \pm 0.8\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _1&= 26 \pm 4 \text { (stat)} \pm 4\text { (syst)}\,\text {Me}\text {V}, \\ m_2&= 6114 \pm 3 \text { (stat)} \pm 5\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _2&= 66 \pm 18 \text { (stat)} \pm 21\text { (syst)}\,\text {Me}\text {V}. \end{aligned}$ Alternative values assuming a decay through ${B} ^{*\pm }{K} ^{\mp }$, with a missing photon from the $B^{*\pm } \rightarrow B^{\pm }\gamma $ decay, which are shifted by approximately 45 $\,\text {Me}$V, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed $B_{s2}^{*0}$ state is determined to be $0.87 \pm 0.15 \text { (stat)} \pm 0.19 \text { (syst)}$.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2021

Measurement of the cross section of top quark pairs produced in association with a Photon in Lepton +Jets events at $\sqrt{s}$ = 13 TeV with full Run II CMS data

The inclusive production cross section of top quark pairs in association with a photon is measured in proton-proton collisions at the LHC with 13 TeV energy using the full RunII data collected by CMS in 2016, 2017, and 2018 with a total corresponding integrated luminosity of 137 fb$^{-1}$. The relative fraction of t$ \bar{t} \gamma$ events normalized to inclusive t$ \bar{t}$ production is measured. The cross section measurement provides important information about the electromagnetic coupling of the standard model top quark and is sensitive to physics beyond the standard model. The analysis is carried out in the in semileptonic decay channel with a well isolated high P$ \_{T}$ lepton (electron and muon), at least four jets out of which at least one must be b-tagged, and an isolated photon. Photons may be emitted from initial state radiation, top quarks, and decay products of top quarks. The fiducial phase space with a photon of transverse momentum $ \ge$ 20 GeV and j\x11$ \eta$ <1.4441 is used. A simultaneous likelihood fit of control regions with the signal region is done to constraint the backgrounds and to extract the t$ \bar{t} \gamma$ cross section. The measurement of the ratio of t$ \bar{t} \gamma$ to t$ \bar{t}$ is $0.02055 \pm 0.00099$ (syst.) $ \pm 0.00099$ (stat.) in $e$ channel , 0.02156 $ \pm$ 0.00068 (syst.) $ \pm$ 0.00068 (stat.) in $ \mu$ channel , and 0.02203 $ \pm$ 0.00064 (syst.) $ \pm$ 0.00064 (stat.) in e + $ \mu$ channel , respectively. The measured inclusive cross section is 3.81 $ \pm$ 0.15 (syst.) $ \pm$ 0.10 (stat.) pb in e channel , 3.87 $ \pm$ 0:11 (syst.) $ \pm$ 0:07 (stat.) pb in $ \mu$ channel , and 3.96 $ \pm$ 0.10 (syst.) $ \pm$ 0.06 (stat.) pb in e + $ \mu$ channel , respectively for full RunII data. The total inclusive cross section with a photon of transverse momentum $ \ge$ 20 GeV is found to be 3.96 $ \pm$ 0.10 (syst.) $ \pm$ 0.06 (stat.) pb with full RunII CMS data. The results are in agreement with the standard model next to leading order prediction.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2020

Materials Data on CaPm3 by Materials Project

CaPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ca is bonded to twelve Pm atoms to form CaPm12 cuboctahedra that share corners with six equivalent CaPm12 cuboctahedra, corners with twelve PmCa4Pm8 cuboctahedra, edges with eighteen PmCa4Pm8 cuboctahedra, faces with eight equivalent CaPm12 cuboctahedra, and faces with twelve PmCa4Pm8 cuboctahedra. There are six shorter (3.70 Å) and six longer (3.72 Å) Ca–Pm bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Ca and eight equivalent Pm atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent CaPm12 cuboctahedra, corners with fourteen equivalent PmCa4Pm8 cuboctahedra, edges with six equivalent CaPm12 cuboctahedra, edges with twelve equivalent PmCa4Pm8 cuboctahedra, faces with four equivalent CaPm12 cuboctahedra, and faces with sixteen PmCa4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.66–3.77 Å. In the second Pm site, Pm is bonded to four equivalent Ca and eight equivalent Pm atoms to form PmCa4Pm8 cuboctahedra that share corners with four equivalent CaPm12 cuboctahedra, corners with fourteen PmCa4Pm8 cuboctahedra, edges with six equivalent CaPm12 cuboctahedra, edges with twelve equivalent PmCa4Pm8 cuboctahedra, faces with four equivalent CaPm12 cuboctahedra, and faces with sixteen PmCa4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.66–3.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Mg by Materials Project

MgPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to twelve Pm atoms to form MgPm12 cuboctahedra that share corners with four equivalent MgPm12 cuboctahedra, corners with eight equivalent PmPm8Mg4 cuboctahedra, edges with eight equivalent MgPm12 cuboctahedra, edges with sixteen equivalent PmPm8Mg4 cuboctahedra, faces with four equivalent MgPm12 cuboctahedra, and faces with fourteen PmPm8Mg4 cuboctahedra. All Mg–Pm bond lengths are 3.54 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Mg and eight equivalent Pm atoms to form PmPm8Mg4 cuboctahedra that share corners with four equivalent PmPm8Mg4 cuboctahedra, corners with eight equivalent MgPm12 cuboctahedra, edges with twenty-four PmPm8Mg4 cuboctahedra, faces with six equivalent MgPm12 cuboctahedra, and faces with twelve PmPm8Mg4 cuboctahedra. All Pm–Pm bond lengths are 3.54 Å. In the second Pm site, Pm is bonded to four equivalent Mg and eight Pm atoms to form PmPm8Mg4 cuboctahedra that share corners with twelve equivalent PmPm8Mg4 cuboctahedra, edges with eight equivalent MgPm12 cuboctahedra, edges with sixteen PmPm8Mg4 cuboctahedra, faces with four equivalent MgPm12 cuboctahedra, and faces with fourteen PmPm8Mg4 cuboctahedra. All Pm–Pm bond lengths are 3.54 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm2Mg by Materials Project

MgPm2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight Pm atoms. There are a spread of Mg–Pm bond distances ranging from 3.33–3.40 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded in a 12-coordinate geometry to six equivalent Mg and four equivalent Pm atoms. There are two shorter (3.71 Å) and two longer (3.73 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded in a 12-coordinate geometry to two equivalent Mg and ten Pm atoms. There are four shorter (3.47 Å) and two longer (3.80 Å) Pm–Pm bond lengths.

36 MATERIALS SCIENCE↗
NASA NTRS2023

Fine particulate concentrations over East Asia derived from aerosols measured by the Advanced Himawari Imager using machine learning

Fine particulate matter with a diameter below 2.5 μm (PM 2.5 ) is deleterious to the cardiovascular and respiratory systems. It is often difficult to assess the effects of PM 2.5 on human health over regions with limited ground monitoring sites, especially in East Asia. As an alternative, we estimated near-surface PM 2.5 concentrations by analyzing Advanced Himawari Imager (AHI) Yonsei Aerosol Retrieval (YAER) products. This study incorporates daytime data for East Asia covering the Korean Peninsula, China, Japan, Southeast Asia, and southern Mongolia. We collocated AHI YAER product pixels with meteorological, land-cover, and other ancillary data for the period from March 2018 to February 2019. To estimate PM 2.5 concentrations over wide areas spanning many countries displaying various relationships between aerosol optical depth and PM 2.5 , monthly models were developed by considering both the spatial and temporal characteristics of ground-based PM 2.5 measurements. Random forest machine learning model estimated ground-level mass concentrations of PM 2.5 ; subsequent 10-fold cross validation (CV) yielded a CV R 2 value of 0.81 and a CV root mean squared error (RMSE) of 12.3 μg m -3 . We investigated the spatial pattern of PM 2.5 concentrations over multiple countries and seasonal variation in PM 2.5 concentrations. Diurnal variation of a severe PM 2.5 event in the Korean Peninsula was investigated as a case study. The model captured the extremely heterogeneous spatial distribution of PM 2.5 concentrations peaked around local noon. To measure the capability of the developed model to estimate PM 2.5 concentrations in areas with few in-situ data, its predictive performance was evaluated using a dataset independent of the training process with an R 2 of 0.60 and RMSE of 8.18 μg m −3 . This study demonstrates the potential for satellite-based PM 2.5 estimation for areas with insufficient measuring stations.

Pm2.5↗
DOE OSTI2020

Materials Data on Pm3Zr by Materials Project

Pm3Zr is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Zr atoms to form PmPm8Zr4 cuboctahedra that share corners with twelve equivalent PmPm8Zr4 cuboctahedra, edges with eight equivalent ZrPm12 cuboctahedra, edges with sixteen PmPm8Zr4 cuboctahedra, faces with four equivalent ZrPm12 cuboctahedra, and faces with fourteen PmPm8Zr4 cuboctahedra. There are four shorter (3.52 Å) and four longer (3.53 Å) Pm–Pm bond lengths. All Pm–Zr bond lengths are 3.52 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Zr atoms to form PmPm8Zr4 cuboctahedra that share corners with four equivalent PmPm8Zr4 cuboctahedra, corners with eight equivalent ZrPm12 cuboctahedra, edges with twenty-four PmPm8Zr4 cuboctahedra, faces with six equivalent ZrPm12 cuboctahedra, and faces with twelve PmPm8Zr4 cuboctahedra. All Pm–Zr bond lengths are 3.53 Å. Zr is bonded to twelve Pm atoms to form ZrPm12 cuboctahedra that share corners with four equivalent ZrPm12 cuboctahedra, corners with eight equivalent PmPm8Zr4 cuboctahedra, edges with eight equivalent ZrPm12 cuboctahedra, edges with sixteen equivalent PmPm8Zr4 cuboctahedra, faces with four equivalent ZrPm12 cuboctahedra, and faces with fourteen PmPm8Zr4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Zn by Materials Project

Pm3Zn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Zn atoms to form distorted PmPm8Zn4 cuboctahedra that share corners with twelve equivalent PmPm8Zn4 cuboctahedra, edges with eight equivalent PmPm8Zn4 cuboctahedra, edges with eight equivalent ZnPm12 cuboctahedra, faces with four equivalent ZnPm12 cuboctahedra, and faces with ten equivalent PmPm8Zn4 cuboctahedra. There are four shorter (3.38 Å) and four longer (3.46 Å) Pm–Pm bond lengths. All Pm–Zn bond lengths are 3.46 Å. In the second Pm site, Pm is bonded in a distorted square co-planar geometry to eight equivalent Pm and four equivalent Zn atoms. All Pm–Zn bond lengths are 3.38 Å. Zn is bonded to twelve Pm atoms to form ZnPm12 cuboctahedra that share corners with four equivalent ZnPm12 cuboctahedra, edges with eight equivalent ZnPm12 cuboctahedra, edges with sixteen equivalent PmPm8Zn4 cuboctahedra, faces with four equivalent ZnPm12 cuboctahedra, and faces with eight equivalent PmPm8Zn4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Y by Materials Project

Pm3Y is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Y atoms to form PmPm8Y4 cuboctahedra that share corners with twelve equivalent PmPm8Y4 cuboctahedra, edges with eight equivalent YPm12 cuboctahedra, edges with sixteen PmPm8Y4 cuboctahedra, faces with four equivalent YPm12 cuboctahedra, and faces with fourteen PmPm8Y4 cuboctahedra. All Pm–Pm bond lengths are 3.64 Å. All Pm–Y bond lengths are 3.64 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Y atoms to form PmPm8Y4 cuboctahedra that share corners with four equivalent PmPm8Y4 cuboctahedra, corners with eight equivalent YPm12 cuboctahedra, edges with twenty-four PmPm8Y4 cuboctahedra, faces with six equivalent YPm12 cuboctahedra, and faces with twelve PmPm8Y4 cuboctahedra. All Pm–Y bond lengths are 3.64 Å. Y is bonded to twelve Pm atoms to form YPm12 cuboctahedra that share corners with four equivalent YPm12 cuboctahedra, corners with eight equivalent PmPm8Y4 cuboctahedra, edges with eight equivalent YPm12 cuboctahedra, edges with sixteen equivalent PmPm8Y4 cuboctahedra, faces with four equivalent YPm12 cuboctahedra, and faces with fourteen PmPm8Y4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Pr by Materials Project

Pm3Pr is Copper-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Pr atoms to form PmPm8Pr4 cuboctahedra that share corners with twelve equivalent PmPm8Pr4 cuboctahedra, edges with eight equivalent PrPm12 cuboctahedra, edges with sixteen PmPm8Pr4 cuboctahedra, faces with four equivalent PrPm12 cuboctahedra, and faces with fourteen PmPm8Pr4 cuboctahedra. There are four shorter (3.67 Å) and four longer (3.68 Å) Pm–Pm bond lengths. All Pm–Pr bond lengths are 3.68 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Pr atoms to form PmPm8Pr4 cuboctahedra that share corners with four equivalent PmPm8Pr4 cuboctahedra, corners with eight equivalent PrPm12 cuboctahedra, edges with twenty-four PmPm8Pr4 cuboctahedra, faces with six equivalent PrPm12 cuboctahedra, and faces with twelve PmPm8Pr4 cuboctahedra. All Pm–Pr bond lengths are 3.67 Å. Pr is bonded to twelve Pm atoms to form PrPm12 cuboctahedra that share corners with four equivalent PrPm12 cuboctahedra, corners with eight equivalent PmPm8Pr4 cuboctahedra, edges with eight equivalent PrPm12 cuboctahedra, edges with sixteen equivalent PmPm8Pr4 cuboctahedra, faces with four equivalent PrPm12 cuboctahedra, and faces with fourteen PmPm8Pr4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Sc by Materials Project

Pm3Sc is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Sc atoms to form PmPm8Sc4 cuboctahedra that share corners with twelve equivalent PmPm8Sc4 cuboctahedra, edges with eight equivalent ScPm12 cuboctahedra, edges with sixteen PmPm8Sc4 cuboctahedra, faces with four equivalent ScPm12 cuboctahedra, and faces with fourteen PmPm8Sc4 cuboctahedra. There are four shorter (3.56 Å) and four longer (3.57 Å) Pm–Pm bond lengths. All Pm–Sc bond lengths are 3.56 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Sc atoms to form PmPm8Sc4 cuboctahedra that share corners with four equivalent PmPm8Sc4 cuboctahedra, corners with eight equivalent ScPm12 cuboctahedra, edges with twenty-four PmPm8Sc4 cuboctahedra, faces with six equivalent ScPm12 cuboctahedra, and faces with twelve PmPm8Sc4 cuboctahedra. All Pm–Sc bond lengths are 3.57 Å. Sc is bonded to twelve Pm atoms to form ScPm12 cuboctahedra that share corners with four equivalent ScPm12 cuboctahedra, corners with eight equivalent PmPm8Sc4 cuboctahedra, edges with eight equivalent ScPm12 cuboctahedra, edges with sixteen equivalent PmPm8Sc4 cuboctahedra, faces with four equivalent ScPm12 cuboctahedra, and faces with fourteen PmPm8Sc4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaPm3 by Materials Project

Pm3La is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent La atoms to form PmLa4Pm8 cuboctahedra that share corners with twelve equivalent PmLa4Pm8 cuboctahedra, edges with eight equivalent LaPm12 cuboctahedra, edges with sixteen PmLa4Pm8 cuboctahedra, faces with four equivalent LaPm12 cuboctahedra, and faces with fourteen PmLa4Pm8 cuboctahedra. All Pm–Pm bond lengths are 3.69 Å. All Pm–La bond lengths are 3.69 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent La atoms to form PmLa4Pm8 cuboctahedra that share corners with four equivalent PmLa4Pm8 cuboctahedra, corners with eight equivalent LaPm12 cuboctahedra, edges with twenty-four PmLa4Pm8 cuboctahedra, faces with six equivalent LaPm12 cuboctahedra, and faces with twelve PmLa4Pm8 cuboctahedra. All Pm–La bond lengths are 3.69 Å. La is bonded to twelve Pm atoms to form LaPm12 cuboctahedra that share corners with four equivalent LaPm12 cuboctahedra, corners with eight equivalent PmLa4Pm8 cuboctahedra, edges with eight equivalent LaPm12 cuboctahedra, edges with sixteen equivalent PmLa4Pm8 cuboctahedra, faces with four equivalent LaPm12 cuboctahedra, and faces with fourteen PmLa4Pm8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Nd by Materials Project

Pm3Nd is Copper-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Nd atoms to form PmPm8Nd4 cuboctahedra that share corners with twelve equivalent PmPm8Nd4 cuboctahedra, edges with eight equivalent NdPm12 cuboctahedra, edges with sixteen PmPm8Nd4 cuboctahedra, faces with four equivalent NdPm12 cuboctahedra, and faces with fourteen PmPm8Nd4 cuboctahedra. There are four shorter (3.66 Å) and four longer (3.67 Å) Pm–Pm bond lengths. All Pm–Nd bond lengths are 3.67 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Nd atoms to form PmPm8Nd4 cuboctahedra that share corners with four equivalent PmPm8Nd4 cuboctahedra, corners with eight equivalent NdPm12 cuboctahedra, edges with twenty-four PmPm8Nd4 cuboctahedra, faces with six equivalent NdPm12 cuboctahedra, and faces with twelve PmPm8Nd4 cuboctahedra. All Pm–Nd bond lengths are 3.66 Å. Nd is bonded to twelve Pm atoms to form NdPm12 cuboctahedra that share corners with four equivalent NdPm12 cuboctahedra, corners with eight equivalent PmPm8Nd4 cuboctahedra, edges with eight equivalent NdPm12 cuboctahedra, edges with sixteen equivalent PmPm8Nd4 cuboctahedra, faces with four equivalent NdPm12 cuboctahedra, and faces with fourteen PmPm8Nd4 cuboctahedra.

36 MATERIALS SCIENCE↗