GAMMA RAYS FROM INELASTIC NEUTRON SCATTERING IN CHROMIUM

Journal Article · Thu Nov 01 04:00:00 EST 1962 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.128.1246· OSTI ID:4779211

Van Patter, D M; Nath, N; Shafroth, S M; Malik, S S; Rothman, M A

Gamma-ray spectra from the Cr(n,n' gamma ) reaction have been studied using a ring geometry for ten Li/sup 7/(p,n) neutron energies ranging from 0.98 to 3.31 Mev. Isotopic assignments have been made for the observed gamma rays, and differential gamma-ray production cross sections have been obtained at theta = 100 deg , In order to convert these to inelastic neutron cross sections, calculations using Satchler's theory have been carried out for the angular distributions of the pertinent gamma transitions in Cr/sup 50/, Cr/sup 52/, and Cr/sup 54/. The resulting experimental (n,n") cross sections for individual levels have been compared to predictions using Hauser-Feshbach theory and various diffuse surface potentials. The use of the (n,n' gamma ) reaction as a nuclear spectroscopic tool has proved to be of value, since new information has been found concerning the properties of some of the low-lying states of Cr/sup 52/ and Cr/sup 53/. The relationship of these new results to other available experimental evidence and to current theoretical predictions is discussed in detail, particularly the possibility of appreciable fragmentation of the 2p/sub 3/ 2/ and 2p/sub 1/2/ singl-particle states in Cr/sup 53/. The evidence for contributions of core excitation to Cr/sup 53/ states is also considered. Finally, comparison of the total inelastic neutron cross section for Cr and each of its four stable isotopes has been made with theoretical predictions. (auth)

• Research Organization: Franklin Inst., Swarthmore, Penna.
• NSA Number: NSA-17-000850
• OSTI ID: 4779211
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 128; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

HAUSER-FESHBACH THEORY
PHYSICS