Analyzing powers for the (p, α) reactions on 58, 60, 62Ni at Ep = 22 MeV |
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Authors: | Y Tagishi K Katori M Sasagase M Sato T Mikumo |
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Institution: | Institute of Physics and Tandem Accelerator Center, The University of Tsukuba, Ibaraki 305, Japan |
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Abstract: | Measurements of both the analyzing power and cross section were made for the (p, α) reactions on 58,60,62Ni at an incident energy of 22 MeV. Data were taken for the strongly populated proton-hole states (0f, 1s and 0d) in the residual cobalt isotopes and for 8 weakly populated low-lying states in 55Co and 59Co. Angular distributions were taken between θlab = 10° and 140° for the ground state and θlab = 10° and 80° for the excited states. Both the cross sections and analyzing powers exhibit a similar angular distribution for states having the same Jπ values except in the transition to the ? state in 59Co at 1.099 MeV. Using the observed J-dependence of the analyzing power, the unknown Jπ values for the states at 2.982 MeV in 55Co and 3.090 MeV in 59Co are assigned to be ?. The shapes of the differential cross sections were well reproduced by the zero-range DWBA calculations using a triton-cluster form factor. However, all the measured analyzing powers could not be reproduced within the framework of such a simple DWBA calculation. |
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Keywords: | Nuclear Reactions |
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