Study of total discrete gamma radiation from aluminium under 14.9-MeV neutron bombardment

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Nuclear Science and Engineering

OSTI ID:445403

Zhou, H; Huang, G ^[1]

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1. Beijing Normal Univ. (China). Inst. of Low Energy Nuclear Physics

Combining the usual prompt gamma radiation measurement technique and the lifetime correction method for delayed gamma radiation yield measurements allows the study of total discrete gamma radiation from 14.9-MeV neutron-induced {sup 27}Al(n,x{gamma}) reactions., The following are identified: 21 prompt gamma lines from (n,n{prime}{gamma}), (n,p{gamma}), (n,{alpha}{gamma}), (n,n{alpha}{gamma}), (n,pn{gamma}), (n,d{gamma}), and (n,2n{gamma}) reactions; 5 delayed gamma lines from one isomeric state produced in the (n,{alpha}) reaction; and the {beta}{sup {minus}} decay products of the residual nuclei in the (n,p) and (n,{alpha}) reactions. Their differential production cross sections at 55, 90, and 140 deg are determined simultaneously. Compared with previous experimental results, one sees a clear advantage in separating the delayed component from the mixed gamma-ray peaks, which consist of prompt and delayed gamma radiation; completely clean prompt gamma-ray production data are obtained. The accurate (n,p) cross sections and a preliminary (n,{alpha}) cross section are determined from relative differential production cross sections. They are in good agreement with the known activation data obtained from previous measurements and evaluations. The isomeric cross section for the 472.3-keV state of {sup 24}Na is also given. The present result shows that the total gamma radiation measurement method is valuable not only to acquire accurate gamma-ray production data but also to acquire accurate neutron activation data with a wide half-life range.

• OSTI ID: 445403
• Journal Information: Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 1 Vol. 125; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM 27 TARGET
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DELAYED GAMMA RADIATION
MEASURING METHODS
NEUTRON REACTIONS
PROMPT GAMMA RADIATION
SODIUM 24