One- and two-step processes in natural- and unnatural-parity 208Pb(p,t)206Pb reaction at Ep = 22 MeV |
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| Affiliation: | 1. European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, Belgium;2. Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avenida Complutense 22, 28040 Madrid, Spain;1. Department of Physics, University Notre Dame, Notre Dame, IN 46556, United States;2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States |
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| Abstract: | Reaction mechanism and nuclear-structure dependence of the natural- and unnatural-parity 208Pb(p, t)206Pb(2+, 3+, 4+, 5− and 7−) reaction are studied by using a 22 MeV polarized proton beam. Angular distribution of the analyzing power for the second 3+(32+) transition has an opposite sign to that for the 31+ one and the difference is explained in terms of the j-dependence in the sequential two-step (p, d)(d, t) process. The observed analyzing powers and cross sections for the two 3+ transitions are reproduced by the finite-range first- and second-order DWBA calculation. Two-step analysis is necessary to explain the variety of angular distributions of the analyzing powers for the natural-parity transitions. Microscopic analysis in terms of the one- and two-step (p, t) calculation is made for the transitions to the 21–5+, 41–3+, 51, 2− and 71− states in 206Pb. The calculation reproduces the absolute values of the observed cross sections within a factor of 2. |
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