Measurements of 63Cu(n,2n)62Cu and 27Al(n,p)27Mg reaction cross sections for 12.9-15.9 MeV neutrons

63Cu(n,2n)62Cu and 27Al(n,p)27Mg reaction cross sections were measured in the 12.9-15.9 MeV energy region under improved experimental conditions to resolve the discrepancies in the published data. The experimental procedures included irradiation in a low neutron scattering environment and the use of the concentric ring technique for fast-neutron monitoring. A consistency between the results obtained using a Dynamitron and Van de Graaff particle accelerators is reported. Comparison of the experimental results with statistical-model calculations indicate that the 63Cu(n,2n)62Cu reaction proceeds predominantly by compound nucleus formation. A direct interaction contribution must be included for the 27Al(n,p)27Mg reaction.

[1]  J. D. Anderson,et al.  Measurement of sub-Coulomb-barrier charged particles emitted from aluminum and titanium bombarded by 15-MeV neutrons. [Cross sections] , 1977 .

[2]  S. E. Hunt,et al.  A concentric ring technique for the measurement of fast neutron fluxes and energies , 1975 .

[3]  E. Kondaiah.  (n,2n) cross sections and the statistical model predictions , 1974 .

[4]  S. E. Hunt,et al.  An improved neutron monitor geometry for neutron activation , 1973 .

[5]  S. Qaim.  Activation cross sections, isomeric cross-section ratios and systematics of (n, 2n) reactions at 14–15 MeV , 1972 .

[6]  S. E. Hunt,et al.  Determination of the energy dependence of the 63Cu (n,2n)62Cu and 27Al (n,p)27Mg cross-sections, and their application to the measurement of 14-MeV neutron fluxes , 1970 .

[7]  S. E. Hunt,et al.  Absolute determinations of activation cross-sections for 14·7 and 14·8 MeV neutrons , 1969 .

[8]  R. W. Fink,et al.  Neutron activation cross sections at 14.4 MeV for Si and Zn isotopes , 1968 .

[9]  S. Notarrigo,et al.  Some excitation functions of neutron-induced reactions around 14 MeV , 1968 .

[10]  S. Pearlstein.  An extended table of calculated (n,2n) cross sections , 1967 .

[11]  A. Ghose,et al.  (n, p) cross sections of some low Z nuclei for 14.8 MeV neutrons , 1966 .

[12]  L. Rayburn.  (n, 2n) Reaction Cross Sections from 12 to 19.6 MeV , 1963 .

[13]  D. Gardner,et al.  Some activation cross sections for 14.7 MeV neutrons , 1962 .

[14]  F. L. Hassler,et al.  Neutron-Induced Reactions in Third and Fourth Shell Nuclei , 1962 .

[15]  E. Weigold,et al.  Some reaction cross sections for copper and nickel from 13.9 to 14.9 MeV neutron energy , 1962 .

[16]  G. Mani,et al.  Neutron cross-sections in aluminum , 1960 .

[17]  W. E. Thompson,et al.  Cross Sections for the (n,2n) Reaction in N14, P31, Cu63, and Pr141 , 1960 .

[18]  V. M. Talyzin,et al.  Inelastic collision cross-sections of various elements for 14·5-MeV neutrons☆ , 1957 .

[19]  R. L. Clarke,et al.  CROSS-SECTION MEASUREMENTS OF REACTIONS INDUCED BY NEUTRONS OF 14.5 MEV. ENERGY , 1953 .