Elsevier

Nuclear Physics A

Volume 121, Issue 1, 2 December 1968, Pages 161-175
Nuclear Physics A

The single-hole states in the 50 < N ≦ 126 shell with (p, d) reactions

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Abstract

The neutron single-hole states in the 50 < N ≦ 82 shell have been studied by the 140Ce(p, d) reaction at 55 MeV incident energy, and those in the 82 < N ≦ 126 shell by 208, 206Pb(p, d) reactions. Emitted deuterons have been analysed with a broad-range magnetic spectrometer. Angular distributions are analysed in terms of the DWBA method. The l-values for all deuteron groups are assigned, and the jπ value and the spectroscopic factor for each state are obtained. The single-hole energies in 58139Ce81 obtained are d32 − 0; s12 − 0.25; h112 − 0.75; d52 − 1.58; g72 − 2.81 MeV (in excitation energies). These results are much different from those of the Pittsburgh group with the (d, t) reactions. The new result that the g72 state jumps below the d52state is interpreted by considering the interaction between the g72 neutrons and the last eight protons in the g72 orbit of 139Ce. The single-hole energies in 82207Pb125 are: p12 − 0; f52 − 0.57; p32 − 0.90; i132 − 1.63; f72 − 2.34; h92 − 3.41 MeV. The correspondence of the states in 205Pb with those in 207Pb is obtained from the angular distribution analysis. No evidence is found for the J-dependence of angular distributions in either the l = 3 or l = 1 Pb(p, d) transitions. The Q-dependence is discussed.

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    Present address: Department of Physics, Osaka University, Toyonaka, Osaka, Japan.

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