Photodisintegration of /sup 3/H and /sup 3/He. [Threshold to 25 MeV]
The photoneutron cross sections for /sup 3/H and /sup 3/He have been measured from threshold to approx. 25 MeV with monoenergetic photons from the annihilation in flight of fast positrons at the LLL Electron-Positron Linear Accelerator facility. These reactions include the two-body breakup of /sup 3/H and the three-body breakup of both /sup 3/H and /sup 3/He; these measurements for /sup 3/H are the first to span the energy region across the peaks of the cross sections. An efficient BF/sub 3/-tube-and-paraffin neutron detector and high-pressure gaseous samples of several moles each (the activity of the /sup 3/H sample was approx. 200,000 Ci) were employed in these measurements. Measurements on /sup 16/O and /sup 2/H also were performed to verify the absolute cross-section scale. The results, when compared with each other and with results for the two-body breakup cross section for /sup 3/He from the literature, show that the two-body breakup cross sections for /sup 3/H and /sup 3/He have nearly the same shape, but the one for /sup 3/He lies lower in magnitude; the three-body breakup cross section for /sup 3/He lies higher in magnitude and is broader in the peak region and also rises less sharply from threshold than that for /sup 3/H; and these measured differences between the cross sections for the breakup modes largely compensate in their sum, so that the total photon absorption cross sections for /sup 3/H and /sup 3/He are nearly the same in both size and shape at energies near and above their peaks. Theoretical results from the literature disagree with the experimental results to a certain extent over the entire photon-energy region for which the photoneutron cross sections were measured. 50 figures, 7 tables.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5119997
- Report Number(s):
- UCRL-53057; TRN: 80-017439
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Photodisintegration of /sup 3/H and /sup 3/He
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HELIUM 3 TARGET
PHOTONUCLEAR REACTIONS
BREAKUP REACTIONS
TRITIUM TARGET
DEUTERIUM
DIPROTONS
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROGEN 1
INTEGRAL CROSS SECTIONS
MEV RANGE 01-10
MEV RANGE 10-100
PHOTONEUTRONS
TOTAL CROSS SECTIONS
BARYONS
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DATA
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FUNCTIONS
HADRONS
HYDROGEN ISOTOPES
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ISOTOPES
LIGHT NUCLEI
MEV RANGE
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PHOTONUCLEONS
PROTONS
RADIATIONS
STABLE ISOTOPES
TARGETS
651225* - Nuclear Properties & Reactions
A=1-5
Experimental- Nuclear Reactions & Scattering- (-1987)