130 research outputs found
Evidence for shape coexistence in odd-mass rhodium nuclei
Results from the study of the â@âRu (âHe, d) ââRh reaction reveal evidence for shape coexistence in odd-mass rhodium isotopes. The strongly excited states at 786, 806, 969, 1019 and 1355 keV in ââRh are good candidates for a rotational-like positive-parity band with Jâ= l/2+, 3/2+, 5/2+, 7/2+ and 9/2+, respectively, coexisting with spherical shell-model states like lg92 2p12 2p32 and lf52 as well as core-coupled configurations
Quadrupole-deformed and octupole collective bands in Ra
Spins and parities for collective states in Ra have been determined from conversion electron measurements with a mini-orange -spectrometer. The fast-timing method has been used to measure lifetimes of T=550(20) ps and 181(3) ps for the and members of the K=0 band, and T 7 ps and 6 ps for the and members of the K = band, respectively The quadrupole moments, deduced from the B (E2; 2) and B (E2; 4) rates are in good agreement with the previously measured value and the systematics of the region. However, the B(E1) rates of 4 Ă 10 efm, which represent the first B(E1) measurements for this nucleus, are at least 25 times larger than the value previously suggested for Ra. The new results are consistent with the B(E1) rates recently measured for the neighbouring Ra and reveal octupole correlations in Ra
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