Measurement of the lunar neutron density profile
Technical Report
·
OSTI ID:4178959
An in situ measurement of the lunar neutron density from 20 to 400 g/sq cm depth between the lunar surface was made by the Apollo 17 Lunar Neutron Probe Experiment using particle tracks produced by the B 10(n, alpha)Li7 reaction. Both the absolute magnitude and depth profile of the neutron density are in good agreement with past theoretical calculations. The effect of cadmium absorption on the neutron density and in the relative Sm 149 to Gd 157 capture rates obtained experimentally implies that the true lunar Gd157 capture rate is about one half of that calculated theoretically. (auth)
- Research Organization:
- California Inst. of Tech., Pasadena (USA)
- NSA Number:
- NSA-33-003885
- OSTI ID:
- 4178959
- Report Number(s):
- N--75-23440; NASA-CR--141782
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*MOON-- NEUTRON DENSITY
640107* --Physics Research--Astrophysics & Cosmology-- Planetary Phenomena
ALPHA PARTICLES-- BORON 10-- LITHIUM 7-- PICKUP REACTIONS-- THREE-NUCLEON TRANSFER REACTIONS
N56700* --Physics (Astrophysics & Cosmology)--Planetary Phenomena
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640107* --Physics Research--Astrophysics & Cosmology-- Planetary Phenomena
ALPHA PARTICLES-- BORON 10-- LITHIUM 7-- PICKUP REACTIONS-- THREE-NUCLEON TRANSFER REACTIONS
N56700* --Physics (Astrophysics & Cosmology)--Planetary Phenomena
NEUTRON REACTIONS CAPTURE-- GADOLINIUM 157