High-spin states in Kr were studied using the Cu( O,p3n) reaction at 65 MeV at the Florida State University Tandem-LINAC facility. Prompt p-p coincidences were observed using the Pitt-FSU detector array. Twelve new states were found, along with 19 new transitions. The yrast positive-and negative-parity bands were extended up to spins of (45/2+) and (31/2 ), respectively. Spin assignments were made based on directional correlation of oriented nuclei ratios whenever possible. A cranked-shell-model analysis shows some indication for a second band crossing in the positive-parity band at hu 0.75 MeV. This crossing, probably due to an aligned g9/Q neutron pair, occurs with a much larger band interaction than the Srst y9gq proton crossing. An increase in signature splitting above ho 0.75 MeV and a return of large alternations in the B(M1)/B(E2) ratio is consistent with the theoretically predicted return to a nearly oblate shape.PACS number(s): 23.20.Lv, 27.50.+e, 29.30.Kv
High-spin states of ' Nd have been studied using the ' Te(' 0,5n) reaction at 85 MeV. The yrast states observed up to a tentatively assigned spin of 45//2 can be described in a remarkably simple way by the weak coupling of an f7/z neutron to the ' Nd core nucleus. Our results demonstrate that ' 3Nd is one of the best known examples of weak coupling at high angular momentum.PACS number(s): 23.20.Lv, 21.60.Cs, 27.60.+jThe N= 83 isotopes are some of the best candidates in the Periodic Table for weak coupling. Low-energy states in the semimagic N=82 nuclei are generated primarily by excitations of their valence protons (for example, see [1,2]). Consequently, the valence neutron of an N = 83 nucleus should not interfere with the excited states of its N = 82 core, and the coupling between the valence neutron and the core may be
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