Accession Number : AD0739631

Title :   The 7Li(alpha,, n)10B Differential Cross Section for alpha-Energies of up to 8 MeV,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PHYSICS

Personal Author(s) : VAN DER Zwan,L. ; Geiger,K. W.

Report Date : 14 SEP 1971

Pagination or Media Count : 10

Abstract : Three neutron groups, populating the 1.74 MeV, the 0.72 MeV and the ground state of 10B were studied. The 0 degrees differential cross section was determined in 0.1 MeV intervals for E sub alpha = 4.8 to 7.9 MeV. Angular distributions for the n(0) group, populating the ground state of 10B, were taken at fifteen alpha-energies and for the n(1) group at five energies. Neutron production cross sections derived from these distributions were compared to the well-known 10B(n, alpha sub 0) cross section, using the reciprocity theorem, and to the total yield as published by other authors. Except near the 7Li(alpha, n) threshold where the angular distribution is isotropic, all distributions show asymmetry about 90 degrees and generally peak backwards. Compound-nucleus formation involving overlap of several resonances appears dominant for the emission of the ground state neutron group, whereas for the n(1) group certain evidence of the interference between compound-nucleus formation and direction reaction is seen. (Author)

Descriptors :   (*ALPHA PARTICLE REACTIONS, DIFFERENTIAL CROSS SECTIONS), BORON, LITHIUM, NEUTRON CROSS SECTIONS, CANADA

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE