Superconducting Gamma/Neutron Spectrometer Task 1 Completion Report Evaluation of Candidate Neutron-Sensitive Materials [electronic resource].
- Published:
- Washington, D.C : United States. Dept. of Energy. Office of the Assistant Secretary for Defense Programs, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- 16 pages : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of the Assistant Secretary for Defense Programs and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- A review of the scientific literature regarding boron- and lithium-containing compounds was completed. Information such as Debye temperature, heat capacity, superconductivity properties, physical and chemical characteristics, commercial availability, and recipes for synthesis was accumulated and evaluated to develop a list of neutron-sensitive materials likely to perform properly in the spectrometer. The best candidate borides appear to be MgB₂ (a superconductor with T{sub c} = 39 K), B₆Si, B₄C, and elemental boron; all are commercially available. Among the lithium compounds are LiH, LiAl, Li₁₂Si₇, and Li₇Sn₂. These materials have or are expected to have high Debye temperatures and sufficiently low heat capacities at 100 mK to produce a useful signal. The responses of ¹°B and ⁶Li to a fission neutron spectrum were also estimated. These demonstrated that the contribution of scattering events is no more than 3% in a boron-based system and 1.5% in a lithium-based system. This project is concerned with the development of materials for use in a cryogenic neutron spectrometer and is complementary to work in progress by Labov at LLNL to develop a cryogenic gamma ray spectrometer. Refrigeration to 100 mK lowers the heat capacity of these materials to the point that the energy of absorbed gamma and x rays, nuclei scattered by fast neutrons, and ions from (n, α) reactions produce a measurable heat pulse, from which the energy of the incident radiation may be deduced. The objective of this project is the discovery, fabrication, and testing of candidate materials with which a cryogenic neutron spectrometer may be realized.
- Report Numbers:
- E 1.99:y/dx-2490 r1
y/dx-2490 r1 - Subject(s):
- Other Subject(s):
- Note:
- Published through SciTech Connect.
06/20/2002.
"y/dx-2490 r1"
Lamberti, V.E.; Bell, Z.W.
Oak Ridge Y-12 Plant, TN (US) - Type of Report and Period Covered Note:
- Final; 06/20/2002 - 06/20/2002
- Funding Information:
- AC05-00OR-22800
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