Low-lying level structure of the neutron-rich nucleus
نویسندگان
چکیده
The neutron-rich nuclei Nb and Zr have been populated using in-flight fission of a U beam at 345 MeV/nucleon at the RIBF facility. A T1/2 = 150(30) ns isomer at 313 keV has been identified in Nb for the first time. The low-lying levels in Nb have been also populated following the β-decay of Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in Nb.
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تاریخ انتشار 2011