Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “NaB”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaB(H4O3)2 by Materials Project

NaB(HO)6H2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of two hydrogen molecules and one NaB(HO)6 ribbon oriented in the (1, 0, 0) direction. In the NaB(HO)6 ribbon, Na1+ is bonded to six O2- atoms to form edge-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.38–2.58 Å. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.33–1.42 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the fourth H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.63 Å) H–O bond length. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one B3+, and one H1+ atom. In the second O2- site, O2- is bonded in a water-like geometry to one B3+ and one H1+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to one Na1+, one B3+, and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two H1+ atoms. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Dataset for First Full Dalitz Plot Measurement in Neutron β-Decay using the Nab Spectrometer and Implications for New Physics

The Nab apparatus at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source was designed to measure key observations in neutron beta decay, test the Standard Model's description of the weak interaction, and search for new physics. This data was collected using the Nab apparatus and are presented in the article "First Full Dalitz Plot Measurement in Neutron β-Decay using the Nab Spectrometer and Implications for New Physics." This data publication includes CSV (comma-separated values) files which are used to generate Figures 3 - 11 in the linked journal article.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2025

Characterizing the AFP Spin Flipper for the Nab Experiment

The Nab experiment at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) aims to yield a precise measurement of the electron-neutrino correlation parameter, a , to $\frac{Δa}{a}$ = 1 × 10 −3 from the beta-decay of the free neutron. To achieve Nab’s precision goal, polarization of the neutron beam must be near-zero. A polarizer/analyzer combination, neutron monitors, and an Adiabatic Fast Passage (AFP) spin flipper will be used to determine a beam polarization effectively less than 2 × 10 −5 . Here, I will discuss the initial characterization efforts of the Nab spin flipper as well as plans for further testing.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2020

Materials Data on NaB(H4O)2 by Materials Project

NaB(H4O)2 crystallizes in the orthorhombic Pbca space group. The structure is two-dimensional and consists of two NaB(H4O)2 sheets oriented in the (0, 0, 1) direction. Na1+ is bonded in a 8-coordinate geometry to four H+0.75+ and four O2- atoms. There are a spread of Na–H bond distances ranging from 2.43–2.65 Å. There are a spread of Na–O bond distances ranging from 2.41–2.50 Å. B3- is bonded in a tetrahedral geometry to four H+0.75+ atoms. There are a spread of B–H bond distances ranging from 1.22–1.24 Å. There are eight inequivalent H+0.75+ sites. In the first H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the second H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the third H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the fourth H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one Na1+ and one B3- atom. In the fifth H+0.75+ site, H+0.75+ is bonded in a distorted single-bond geometry to one Na1+ and one B3- atom. In the sixth H+0.75+ site, H+0.75+ is bonded in a distorted single-bond geometry to two equivalent Na1+ and one B3- atom. In the seventh H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one B3- atom. In the eighth H+0.75+ site, H+0.75+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two H+0.75+ atoms. In the second O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two H+0.75+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaB(CO2)4 by Materials Project

NaB(CO2)4 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two NaB(CO2)4 sheets oriented in the (1, 0, 0) direction. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.51–2.62 Å. B3+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.48 Å) and two longer (1.49 Å) B–O bond length. There are two inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.33 Å) C–O bond length. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.33 Å) C–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+ and one C3+ atom. In the second O2- site, O2- is bonded in a water-like geometry to one B3+ and one C3+ atom. In the third O2- site, O2- is bonded in a water-like geometry to one B3+ and one C3+ atom. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to one Na1+ and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaB(HO)4 by Materials Project

NaB(OH)4 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two NaB(OH)4 sheets oriented in the (0, 1, 0) direction. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.72 Å. B3+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of B–O bond distances ranging from 1.48–1.50 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to one Na1+, one B3+, and one H1+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+, one B3+, and one H1+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Na1+, one B3+, and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+, one B3+, and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2024

A flexible data acquisition system architecture for the Nab experiment

Here, the Nab experiment will measure the electron–neutrino correlation and Fierz interference term in free neutron beta decay to test the Standard Model and probe Beyond the Standard Model physics. Using National Instrument’s PXIe-5171 Reconfigurable Oscilloscope module, we have developed a data acquisition system that is not only capable of meeting Nab’s specifications, but flexible enough to be adapted in situ as the experimental environment dictates. The L1 and L2 trigger logic can be reconfigured to optimize the system for coincidence event detection at runtime through configuration files and LabVIEW controls. This system is capable of identifying L1 triggers at a rate of at least 1 MHz, while reading out a peak signal rate of approximately 2 GB/s. During the commissioning phase of the experiment, the system ran at a sustained readout rate of 400 MB/s of detector signal data originating from roughly 6 kHz L2 triggers, well within the peak performance of the system.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2026

First full Dalitz plot measurement in neutron 𝛽 decay using the Nab spectrometer and implications for new physics

Precision measurements of observables in neutron 𝛽 decay are used to test the standard model description of the weak interaction and search for evidence of new physics. The Nab experiment at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source was constructed to measure correlations in neutron decay by utilizing an asymmetric spectrometer and novel detection system to accurately reconstruct the proton momentum and electron energy for each 𝛽 decay. This work describes the detection of neutron 𝛽-decay products in the Nab spectrometer and presents the first full Dalitz plot representation of the phase space of neutron 𝛽 decay for all electrons >100 keV. In addition, new constraints are placed on a possible excited neutron state, hypothesized to explain the disagreement between the appearance and disappearance neutron lifetime techniques.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2026

Characterization of Low-energy Ionization Signals in Silicon Detectors for the Nab Experiment

The Nab (Neutron a b) experiment is designed to measure the beta-antineutrino angular correlation in free neutron 𝛽 decay with an ultimate precision goal of 0.1%, providing input for tests of Cabibbo-Kobayashi-Maskawa matrix unitarity. This measurement is performed via detection of electrons and protons in delayed coincidence using custom large-area segmented silicon detectors. We present the characterization of one such detector system to establish the proton energy and timing response, using a dedicated proton accelerator. The detected proton peak was studied for 25, 30, and 35 keV incident protons on a set of detector segments and multiple cooling cycles over a one-year period. Ionization losses were consistent with models of the detector dead layer with thicknesses less than 100 nm. The detected proton peak was stable within the uncertainty from energy calibration (0.25 keV). The rise times of detector pulses from 109Cd and 113Sn conversion electron sources were used to extract the impurity density profile and establish a precise model for the detector timing response. The observed impurity density profile varied from (2±2)×109/cm3 at the center to (26±2)×109/cm3 at the edge. This impurity density profile was then used to characterize systematic effects in proton time-of-flight measurements due to detector pulse-shape effects; the resultant proton timing systematic uncertainties were below 0.3 ns, which is sufficient for the Nab experiment.

Taylor, RJ [North Carolina State University]↗
NASA NTRS2004

An XMM-Newton Study of the Bright Ultrasoft Narrow-Line Quasar NAB 0205+024

The broad-band X-ray continuum of NAB 0205424 is well constrained due to the excellent photon statistics obtained (about 97,700 counts), and its impressive soft X-ray excess is clearly apparent. The hard X-ray power law has become notably steeper than when NAB 0205424 was observed with ASCA, attesting to the presence of significant X-ray spectral variability. A strong and broad emission feature is detected from about 5 to 6.4 keV, and we have modeled this as a relativistic line emitted close to the black hole from a narrow annulus of the accretion disk. Furthermore, a strong X-ray flare is detected with a hard X-ray spectrum; this flare may be responsible for illuminating the inner line-emitting part of the accretion disk. The combined observational results can be broadly interpreted in terms of the "thundercloud model proposed by Merloni & Fabian (2001).

Brandt, Niel↗
DOE OSTI2020

Materials Data on NaB(SO4)2 by Materials Project

NaB(SO4)2 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form distorted NaO6 pentagonal pyramids that share corners with six equivalent SO4 tetrahedra and edges with two equivalent NaO6 pentagonal pyramids. There are a spread of Na–O bond distances ranging from 2.36–2.60 Å. B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with four equivalent SO4 tetrahedra. There is two shorter (1.48 Å) and two longer (1.49 Å) B–O bond length. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with three equivalent NaO6 pentagonal pyramids and corners with two equivalent BO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.44–1.56 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Na1+ and one S6+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one S6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaB(S2O7)2 by Materials Project

NaB(S2O7)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Na1+ is bonded to seven O2- atoms to form distorted NaO7 pentagonal bipyramids that share corners with seven SO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.41–2.81 Å. B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with four SO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.47–1.50 Å. There are four inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent NaO7 pentagonal bipyramids, a cornercorner with one BO4 tetrahedra, and a cornercorner with one SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.43–1.66 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent NaO7 pentagonal bipyramids, a cornercorner with one BO4 tetrahedra, and a cornercorner with one SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.42–1.65 Å. In the third S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent NaO7 pentagonal bipyramids, a cornercorner with one BO4 tetrahedra, and a cornercorner with one SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.43–1.65 Å. In the fourth S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share a cornercorner with one NaO7 pentagonal bipyramid, a cornercorner with one BO4 tetrahedra, and a cornercorner with one SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.42–1.67 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+ and one S6+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the third O2- site, O2- is bonded in a distorted linear geometry to one Na1+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to two S6+ atoms. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+ and one S6+ atom. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the ninth O2- site, O2- is bonded in a bent 120 degrees geometry to two S6+ atoms. In the tenth O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the eleventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one S6+ atom. In the twelfth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one S6+ atom. In the thirteenth O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one S6+ atom. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one S6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaB by Materials Project

NaB is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Na is bonded to six equivalent B atoms to form a mixture of corner and edge-sharing NaB6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Na–B bond lengths are 2.68 Å. B is bonded to six equivalent Na atoms to form a mixture of corner and edge-sharing BNa6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Precision pulse shape simulation for proton detection at the Nab experiment

The Nab experiment at Oak Ridge National Laboratory, USA, aims to measure the beta-antineutrino angular correlation following neutron β decay to an anticipated precision of approximately 0.1%. The proton momentum is reconstructed through proton time-of-flight measurements, and potential systematic biases in the timing reconstruction due to detector effects must be controlled at the nanosecond level. In conclusion, we present a thorough and detailed semiconductor and quasiparticle transport simulation effort to provide precise pulse shapes, and report on relevant systematic effects and potential measurement schemes.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2024

Study of neutron beta decay with the Nab experiment

The current three sigma tension in the unitarity test of the Cabbibo-Kobayashi-Maskawa (CKM) matrix is a notable problem with the Standard Model of elementary particle physics. A long-standing goal of the study of free neutron beta decay is to better determine the CKM element Vud through measurements of the neutron lifetime and a decay correlation parameter. The Nab collaboration intends to measure a, the neutrino-electron correlation, with accuracy sufficient for a competitive evaluation of Vud based on neutron decay data alone. This paper gives a status report and an outlook.

Baessler, Stefan↗
DOE OSTI2020

Materials Data on NaB(CN)4 by Materials Project

Na(CN)4B is Zintl Phase structured and crystallizes in the cubic Fd-3m space group. The structure is zero-dimensional and consists of eight boron molecules and eight Na(CN)4 clusters. In each Na(CN)4 cluster, Na1+ is bonded in a tetrahedral geometry to four equivalent N3- atoms. All Na–N bond lengths are 2.39 Å. C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.16 Å. N3- is bonded in a linear geometry to one Na1+ and one C2+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS2013

Trajectories to Nab a NEA (Near-Earth Asteroid)

In 2010 and 2011 NASA and KISS sponsored studies to investigate the feasibility of identifying, capturing, and returning an entire (albeit small) NEA to the vicinity of Earth, and concluded that a 40-kW solar electric propulsion system launched on an Atlas 551 provided sufficient propulsion to control an asteroid's trajectory. Once secured by the spacecraft, a NEA with a naturally close encounter with Earth is nudged over a few years to target a lunar gravity assist, capturing the object into Earth orbit. With further use of solar perturbations, up to 3,600,000 kg of NEA could be placed in high-lunar orbit.

solar electric propulsion↗