First β-decay spectroscopy of <SUP>135</SUP>In and new β-decay branches of <SUP>134</SUP>In



Piersa-Silkowska, M, Korgul, A, Benito, J, Fraile, LM, Adamska, E, Andreyev, AN, Alvarez-Rodriguez, R, Barzakh, AE, Benzoni, G, Berry, T
et al (show 83 more authors) (2021) First β-decay spectroscopy of <SUP>135</SUP>In and new β-decay branches of <SUP>134</SUP>In. PHYSICAL REVIEW C, 104 (4). 044328-.

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Abstract

The  decay of the neutron-rich and was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number above the shell. The -delayed -ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three -decay branches of were established, two of which were observed for the first time. Population of neutron-unbound states decaying via rays was identified in the two daughter nuclei of and , at excitation energies exceeding the neutron separation energy by 1 MeV. The -delayed one- and two-neutron emission branching ratios of were determined and compared with theoretical calculations. The -delayed one-neutron decay was observed to be dominant -decay branch of even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of . Transitions following the  decay of are reported for the first time, including rays tentatively attributed to . In total, six new levels were identified in on the basis of the coincidences observed in the and decays. A transition that might be a candidate for deexciting the missing neutron single-particle state in was observed in both  decays and its assignment is discussed. Experimental level schemes of and are compared with shell-model predictions. Using the fast timing technique, half-lives of the , and levels in were determined. From the lifetime of the state measured for the first time, an unexpectedly large transition strength was deduced, which is not reproduced by the shell-model calculations.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 12 Nov 2021 10:31
Last Modified: 15 Mar 2024 04:00
DOI: 10.1103/PhysRevC.104.044328
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3143086