L. Heilbronn
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View article: Space Environmental Effects on Multifunctional Radiation Shielding Materials
Space Environmental Effects on Multifunctional Radiation Shielding Materials Open
The two primary material requirements for a crewed habitat or spacecraft to operate beyond low earth orbit (LEO) include effective radiation shielding against the space radiation and secondary neutron environment and sufficient structural …
View article: Improved limits on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>n</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> transformation from the Spallation Neutron Source
Improved limits on transformation from the Spallation Neutron Source Open
Conversions between neutrons n and dark matter candidate sterile neutrons n′ have been proposed as a mechanism for baryon number B violation. In the case that there is a small mass difference Δm between the n and the n′ states, oscillation…
View article: Space Environmental Effects on Multifunctional Radiation Shielding Materials
Space Environmental Effects on Multifunctional Radiation Shielding Materials Open
The two primary material requirements for a crewed habitat or spacecraft to operate beyond low earth orbit (LEO) include effective radiation shielding against the space radiation and secondary neutron environment and sufficient structural …
View article: Improved Limits on $n \rightarrow n'$ Transformation from the Spallation Neutron Source
Improved Limits on $n \rightarrow n'$ Transformation from the Spallation Neutron Source Open
Conversions between neutrons $n$ and Dark Matter candidate sterile neutrons $n'$ have been proposed as a mechanism for Baryon Number $\mathcal{B}$ violation. In the case that there is a small mass difference $Δ{m}$ between the $n$ and the …
View article: Proceedings of the Workshop for Applied Nuclear Data Activities WANDA 2022
Proceedings of the Workshop for Applied Nuclear Data Activities WANDA 2022 Open
On February 28 – March 4, 2022, the Nuclear Data Interagency Working Group (NDIAWG) hosted the 5-day virtual Workshop for Applied Nuclear Data (WANDA2022) to facilitate interagency collaboration on nuclear data for applications. This year’…
View article: Novel methods for TH-229 production through fast neutron irradiation of TH-23F0 and charged particle irradiation of Th-230 and Th-232. Final Report DE-SC0020140
Novel methods for TH-229 production through fast neutron irradiation of TH-23F0 and charged particle irradiation of Th-230 and Th-232. Final Report DE-SC0020140 Open
The activities and results of research related to accelerator production of Pa and Th isotopes via bombardment of 230Th and 232Th targets are described herein. This research was supported through DOE grant DE-SC0020140 and was conducted in…
View article: Comparison of Doses in Lunar Habitats Located at the Surface and in Crater
Comparison of Doses in Lunar Habitats Located at the Surface and in Crater Open
As humanity prepares for extended lunar exploration, understanding the radiation environment on the Moon is important for astronaut safety. This study utilized the Particle and Heavy-Ion Transport code System (PHITS), a stochastic Monte Ca…
View article: Nuclear Physics, Radioisotope Fuels, and Protective Components
Nuclear Physics, Radioisotope Fuels, and Protective Components Open
The radioisotope thermoelectric generator (RTG) represents a unique device requiring a confluence of disciplines, to include aerospace, materials science, and nuclear engineering, on an extraordinary level. This chapter provides foundation…
View article: Demonstration of the neutron tracking capability of NEXT array in time-of-flight measurements to improve energy resolution
Demonstration of the neutron tracking capability of NEXT array in time-of-flight measurements to improve energy resolution Open
Precise neutron-energy measurements are required to probe the nuclear structure effects of neutron-rich nuclei, where β-delayed neutron emission becomes a dominant decay mode. The Neutron dEtector with Xn Tracking (NEXT) array has been des…
View article: First Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee
First Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee Open
Accurate, reliable nuclear data is essential for the success of Federal missions such as nonproliferation, nuclear forensics, homeland security, national defense, space exploration, clean energy generation, and scientific research. Data ac…
View article: Heavy Ion Medical Accelerator in Chiba (HIMAC) Experimental Data
Heavy Ion Medical Accelerator in Chiba (HIMAC) Experimental Data Open
This report provides experimental data obtained using the Heavy Ion Medical Accelerator in Chiba (HIMAC) facility of the National Institute of Radiological Sciences (NIRS) in Japan.
View article: Experimental Search for Neutron to Mirror Neutron Oscillations as an Explanation of the Neutron Lifetime Anomaly
Experimental Search for Neutron to Mirror Neutron Oscillations as an Explanation of the Neutron Lifetime Anomaly Open
An unexplained >4σ discrepancy persists between "beam" and "bottle" measurements of the neutron lifetime. A new model proposed that conversions of neutrons n into mirror neutrons n^{'}, part of a dark mirror sector, can increase the appare…
View article: Current nuclear data needs for applications
Current nuclear data needs for applications Open
Accurate nuclear data provide an essential foundation for advances in a wide range of fields, including nuclear energy, nuclear safety and security, safeguards, nuclear medicine, and planetary and space exploration. In these and other crit…
View article: Working Group Report: Baryon Number Violation
Working Group Report: Baryon Number Violation Open
This report, prepared for the Community Planning Study - Snowmass 2013 - summarizes the theoretical motivations and the experimental efforts to search for baryon number violation, focussing on nucleon decay and neutron-antineutron oscillat…
View article: 7.2.2 Secondary Neutron Production Cross Section Measurements from Heavy-mass Targets at HIMAC
7.2.2 Secondary Neutron Production Cross Section Measurements from Heavy-mass Targets at HIMAC Open
The measurements of secondary neutron production cross sections from heavy-ion interactions play a key role in the development of transport model calculations that are used in a wide variety of applications. We briefly describe and highlig…
View article: 5.2.1 Fragmentation Physics and Spacecraft Shielding Studies
5.2.1 Fragmentation Physics and Spacecraft Shielding Studies Open
Measurements of nuclear fragmentation cross sections and of particle production in thick targets are needed for the development of space radiation shielding. Cross sections are used as source terms for models of fragmentation and transport…
View article: ∆<i>E</i>/∆<i>E</i> Measurements of Energetic Ions Using CVD Diamond Detectors
∆<i>E</i>/∆<i>E</i> Measurements of Energetic Ions Using CVD Diamond Detectors Open
Experimental and computational results of a Δ E /Δ E diamond detection system are presented. The Δ E /Δ E detection system was evaluated using energetic proton and iron beams striking thick polyethylene targets at the NASA Space Radiation …
View article: New Search for Mirror Neutrons at HFIR
New Search for Mirror Neutrons at HFIR Open
The theory of mirror matter predicts a hidden sector made up of a copy of the Standard Model particles and interactions but with opposite parity. If mirror matter interacts with ordinary matter, there could be experimentally accessible imp…