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All sourcesNASA NTRSDOE OSTI
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↗
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↗
DOE OSTI2020

Materials Data on CePm3 by Materials Project

Pm3Ce 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 Ce atoms to form PmCe4Pm8 cuboctahedra that share corners with twelve equivalent PmCe4Pm8 cuboctahedra, edges with eight equivalent CePm12 cuboctahedra, edges with sixteen PmCe4Pm8 cuboctahedra, faces with four equivalent CePm12 cuboctahedra, and faces with fourteen PmCe4Pm8 cuboctahedra. There are four shorter (3.64 Å) and four longer (3.66 Å) Pm–Pm bond lengths. All Pm–Ce bond lengths are 3.66 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Ce atoms to form PmCe4Pm8 cuboctahedra that share corners with four equivalent PmCe4Pm8 cuboctahedra, corners with eight equivalent CePm12 cuboctahedra, edges with twenty-four PmCe4Pm8 cuboctahedra, faces with six equivalent CePm12 cuboctahedra, and faces with twelve PmCe4Pm8 cuboctahedra. All Pm–Ce bond lengths are 3.64 Å. Ce is bonded to twelve Pm atoms to form CePm12 cuboctahedra that share corners with four equivalent CePm12 cuboctahedra, corners with eight equivalent PmCe4Pm8 cuboctahedra, edges with eight equivalent CePm12 cuboctahedra, edges with sixteen equivalent PmCe4Pm8 cuboctahedra, faces with four equivalent CePm12 cuboctahedra, and faces with fourteen PmCe4Pm8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Hf by Materials Project

Pm3Hf 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 Hf atoms to form PmPm8Hf4 cuboctahedra that share corners with twelve equivalent PmPm8Hf4 cuboctahedra, edges with eight equivalent HfPm12 cuboctahedra, edges with sixteen PmPm8Hf4 cuboctahedra, faces with four equivalent HfPm12 cuboctahedra, and faces with fourteen PmPm8Hf4 cuboctahedra. All Pm–Pm bond lengths are 3.51 Å. All Pm–Hf bond lengths are 3.51 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Hf atoms to form PmPm8Hf4 cuboctahedra that share corners with four equivalent PmPm8Hf4 cuboctahedra, corners with eight equivalent HfPm12 cuboctahedra, edges with twenty-four PmPm8Hf4 cuboctahedra, faces with six equivalent HfPm12 cuboctahedra, and faces with twelve PmPm8Hf4 cuboctahedra. All Pm–Hf bond lengths are 3.51 Å. Hf is bonded to twelve Pm atoms to form HfPm12 cuboctahedra that share corners with four equivalent HfPm12 cuboctahedra, corners with eight equivalent PmPm8Hf4 cuboctahedra, edges with eight equivalent HfPm12 cuboctahedra, edges with sixteen equivalent PmPm8Hf4 cuboctahedra, faces with four equivalent HfPm12 cuboctahedra, and faces with fourteen PmPm8Hf4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2024

The value of adding black carbon to community monitoring of particulate matter

Low-cost particulate matter (PM) sensors are increasingly used by researchers, public health agencies, and the public to measure spatial and temporal variations in air pollution, which can inform strategies for community air pollution reduction. While low-cost PM sensors provide a valuable measure of harmful fine particulate matter (PM 2.5 ), a significant portion of ambient PM 2.5 is typically the secondary product of air pollution emitted by varied sources outside of community boundaries. In contrast, concentrations of black carbon (BC), a component of PM 2.5 , are directly emitted by a few specific sources, such as diesel engines within communities. Motivated by community organizations seeking to understand persistent sources of local pollution, this study deployed a suite of custom-built BC sensors alongside a network of low-cost PM sensors for four weeks in two seasons at 50 stationary locations in the adjacent cities of Richmond, North Richmond, and San Pablo, California, east of the San Francisco Bay. Concentrations of BC varied more than PM 2.5 both temporally and spatially. Monthly network-average BC was 3×higher in winter than late spring, while PM 2.5 was only 10% lower. In both seasons, average PM 2.5 concentrations at two-thirds of sites were within ±10% of the network average, whereas two-thirds of sites had BC levels outside of ±10% of the network-average concentration. The most and least polluted locations were more persistent across seasons for BC than PM 2.5 , and the temporal dynamics of BC at these sites were similar, signifying that they are impacted by the same emission sources. Together, these spatiotemporal trends show that BC is a better indicator of the proximity and activity of local pollution sources than PM 2.5 . Thus, including BC in addition to PM 2.5 in community monitoring networks can provide additional insights about local sources of air pollution.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on YbPm3 by Materials Project

YbPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded to twelve Pm atoms to form YbPm12 cuboctahedra that share corners with four equivalent YbPm12 cuboctahedra, corners with eight equivalent PmYb4Pm8 cuboctahedra, edges with eight equivalent YbPm12 cuboctahedra, edges with sixteen equivalent PmYb4Pm8 cuboctahedra, faces with four equivalent YbPm12 cuboctahedra, and faces with fourteen PmYb4Pm8 cuboctahedra. All Yb–Pm bond lengths are 3.67 Å. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Yb and eight Pm atoms to form PmYb4Pm8 cuboctahedra that share corners with twelve equivalent PmYb4Pm8 cuboctahedra, edges with eight equivalent YbPm12 cuboctahedra, edges with sixteen PmYb4Pm8 cuboctahedra, faces with four equivalent YbPm12 cuboctahedra, and faces with fourteen PmYb4Pm8 cuboctahedra. All Pm–Pm bond lengths are 3.67 Å. In the second Pm site, Pm is bonded to four equivalent Yb and eight equivalent Pm atoms to form PmYb4Pm8 cuboctahedra that share corners with four equivalent PmYb4Pm8 cuboctahedra, corners with eight equivalent YbPm12 cuboctahedra, edges with twenty-four PmYb4Pm8 cuboctahedra, faces with six equivalent YbPm12 cuboctahedra, and faces with twelve PmYb4Pm8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AcPm3 by Materials Project

AcPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ac is bonded to twelve Pm atoms to form AcPm12 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with eight equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen equivalent PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and eight longer (3.74 Å) Ac–Pm bond lengths. There are two 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 twelve equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and four longer (3.74 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded to four equivalent Ac and eight equivalent Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent PmAc4Pm8 cuboctahedra, corners with eight equivalent AcPm12 cuboctahedra, edges with twenty-four PmAc4Pm8 cuboctahedra, faces with six equivalent AcPm12 cuboctahedra, and faces with twelve PmAc4Pm8 cuboctahedra.

36 MATERIALS SCIENCE↗