Cr52(p,n)52Mng,m and Cr52(d,2n)52Mng,m excitation functions

H. I. West, Jr., R. G. Lanier, and M. G. Mustafa
Phys. Rev. C 35, 2067 – Published 1 June 1987
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Abstract

We have irradiated natural chromium with protons and deuterons to produce Mng52,m, primarily from the Cr52(p,n) and Cr52(d,2n) reactions. The excitation functions up to 27 MeV were measured by the foil activation method and were compared with results from a statistical model calculation based on the Hauser-Feshbach formalism with preequilibrium emission. For Cr52(p,n)52Mng,m, both the total cross section, σ(g+m), and the isomer ratio, σ(m)/σ(g), are reproduced to within 10% by the calculations. By contrast, for the Cr52(d,2n)52Mng,m reaction, we find that calculations overestimate σ(g+m) by 50% and underestimate σ(m)/σ(g) by nearly one-half. We find that arbitrary adjustments of level density or preequilibrium parameters can yield approximate agreement for σ(g+m) but do not improve the agreement for σ(m)/σ(g). A part of this discrepancy may be due to the fact that the preequilibrium calculations do not include angular momentum. However, to fully understand this discrepancy, deuteron breakup effects in the entrance channel must be taken into account. A companion paper explores this idea.

  • Received 24 November 1986

DOI:https://doi.org/10.1103/PhysRevC.35.2067

©1987 American Physical Society

Authors & Affiliations

H. I. West, Jr., R. G. Lanier, and M. G. Mustafa

  • Nuclear Chemistry Division, Lawrence Livermore National Laboratory, University of California, Livermore, California 94550

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Vol. 35, Iss. 6 — June 1987

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