Probing Nuclear Shell Structure beyond the N = 40 Subshell using Multiple Coulomb Excitation and Transfer Experiments
Abstract
In the last decades, enormous efforts have been made to study the evolution of nuclear shell structure going from the valley of stability towards exotic nuclei.Modern experiments at the newly developed radioactive beam facilities revealed that some of the classical magic numbers have to be replaced by new magic numbers going to the drip lines.For this thesis, the subshell closure at the neutron number N = 40 is of particular interest.It mimics a magic behavior, especially for 68 Ni which features in addition a magic proton shell (Z = 28).However, the magic properties are very localized since the neighboring zinc isotopes (Z = 30) already show collective features.As, additionally, there is strong tension in the available experimental data, the nature of the zinc isotopes is addressed in this thesis with two complementary experimental methods: Transfer reactions and multiple Coulomb excitation.Both experiments were performed with a radioactive 72 Zn beam provided by the REX-ISOLDE accelerator at CERN.In a transfer experiment, a 72 Zn beam (E beam = 2.7 MeV/u) was impinging on a radioactive tritium target to study the two-neutron transfer reaction t( 72 Zn, p) 74 Zn and the one-neutron transfer reaction t( 72 Zn, d) 73 Zn simultaneously.To disentangle the reaction channels, the light transfer products p and d were identified with the ∆E-E telescopes of the nearly 4π silicon detector array T-REX.From the energy and the position information of the detected particles, excitation…
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