THE EXCITATION FUNCTION FOR THE REACTION 52CR(N,2N)51CR
The excitation function for the (n,2n) reaction on the main isotope of the structural material chromium 52Cr(n,2n)51Cr was determined from threshold to about 20 MeV using the activation technique. Quasi-monoenergetic neutrons were produced via the T(d,n)4He reaction, making use of the neutron energy variation with emission angle. The neutron fluences for the 24 symmetrically arranged samples were determined relative to the well-known angular distribution of the source neutrons and the n-p scattering cross section using a recoil proton telescope. In addition, they were checked around 14 MeV against the well-evaluated Nb(n,2n) cross section. The induced 51Cr(T(1/2) = 27.7d) gamma-ray activities were measured by means of an intrinsic solid state Ge-detector and a carefully calibrated NaI(T1) well-type scintillator. The results agreed at 14MeV with the many experimental results published earlier. However, they disagreed with 2 earlier experimental excitation functions above 15 MeV. Theoretical calculations based on direct inelastic scattering, on pre-equilibrium emission and on sequential evaporation from the equilibrated compound nucleus were also performed. Results showed satisfying agreement with the experimental data and similar theoretical results obtained elsewhere.
Bibliographic Reference: ARTICLE: ANNALS OF NUCLEAR ENERGY, VOL. 16 (1989) NO. 11, PP. 563-570
Record Number: 1989128060500 / Last updated on: 1990-11-09
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