Neutron cross section standards and instrumentation
This report from the National Institute of Standards and Technology contains a summary of the accomplishments of the Neutron Cross Section Standards and Instrumentation Project during the second year of a three-year interagency agreement. This program includes a broad range of data measurements and evaluations. An emphasis has been focused on the [sup 10]B cross sections where serious discrepancies in the nuclear data base remain. In particular, there are important problems with the interpretation of the helium gas production associated with diagnostic measurements of interest in nuclear technology. The enhanced use of this isotope for medical treatment is also of significance. New measurements of neutron reaction cross sections for [sup 10]B are in progress in collaboration with scientists at the Oak Ridge National Laboratory. New experiments are in progress on the important dosimetry standards [sup 237]Np(n,f) and [sup 239]Pu(n,f) below 1 MeV neutron energy. In addition, new measurements of charged-particle production in basic biological elements for medical applications are underway. Further measurements are planned or in progress in collaborations which include fission fragment energy and angular distributions, and neutron energy spectra and angular distributions from neutron-induced fission. Also measurements of angular distributions of neutrons from scattering on protons, and determinations of capture cross section of gold are planned for a later time. Data evaluation will shift to include a unified international effort to motivate new measurements and evaluations. In response to the requests of the measurement community, NIST is beginning the formation of a national depository for fissionable isotope mass standards. This action will preserve for future measurements the valuable and irreplaceable critical samples whose masses and composition have been carefully determined and documented over the past 30 years of the nuclear program.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AI05-91ER40610
- OSTI ID:
- 6743617
- Report Number(s):
- DOE/ER/40610-T1; ON: DE93007675
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON 10 TARGET
NEUTRON REACTIONS
COMPOUND-NUCLEUS REACTIONS
ALPHA PARTICLES
DIFFERENTIAL CROSS SECTIONS
EVALUATED DATA
EXCITATION FUNCTIONS
LITHIUM 7
PROGRESS REPORT
ALKALI METAL ISOTOPES
BARYON REACTIONS
CHARGED PARTICLES
CROSS SECTIONS
DATA
DOCUMENT TYPES
FUNCTIONS
HADRON REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LITHIUM ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
STABLE ISOTOPES
TARGETS
663430* - Nucleon-Induced Reactions & Scattering- (1992-)
663520 - Nuclear Mass Ranges- A=6-19- (1992-)
663590 - Nuclear Mass Ranges- A=220 & Above- (1992-)