A1 Journal article (refereed)
First β-decay spectroscopy of 135In and new β-decay branches of 134In (2021)

Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, L. M., Adamska, E., Andreyev, A. N., Álvarez-Rodríguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Day, G. T., De Witte, H., Fedorov, D. V., . . . Wilkins, S. G. (2021). First β-decay spectroscopy of 135In and new β-decay branches of 134In. Physical Review C, 104(4), Article 044328. https://doi.org/10.1103/PhysRevC.104.044328

JYU authors or editors

Publication details

All authors or editors: Piersa-Siłkowska, M.; Korgul, A.; Benito, J.; Fraile, L. M.; Adamska, E.; Andreyev, A. N.; Álvarez-Rodríguez, R.; Barzakh, A. E.; Benzoni, G.; Berry, T.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2021

Publication date: 26/10/2021

Volume: 104

Issue number: 4

Article number: 044328

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.104.044328

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/78810


The β decay of the neutron-rich 134In and 135In was investigated experimentally in order to provide new
insights into the nuclear structure of the tin isotopes with magic proton number Z = 50 above the N = 82
shell. The β-delayed γ -ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where
indium isotopes were selectively laser-ionized and on-line mass separated. Three β-decay branches of 134In were established, two of which were observed for the first time. Population of neutron-unbound states decaying via γ rays was identified in the two daughter nuclei of 134In, 134Sn and 133Sn, at excitation energies exceeding the neutron separation energy by 1 MeV. The β-delayed one- and two-neutron emission branching ratios of 134In were determined and compared with theoretical calculations. The β-delayed one-neutron decay was observed to be dominant β-decay branch of 134In even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of 134Sn. Transitions following the β decay of 135In are reported for the first time, including γ rays tentatively attributed to 135Sn. In total, six new levels were identified in 134Sn on the basis of the βγγ coincidences observed in the 134In and 135In β decays. A transition that might be a candidate for deexciting the missing neutron single-particle 13/2+ state in 133Sn was observed in both β decays and its assignment is discussed. Experimental level schemes of 134Sn and 135Sn are compared with shell-model predictions. Using the fast timing technique, half-lives of the 2+, 4+, and 6+ levels in 134Sn were determined. From the lifetime of the 4+ state measured for the first time, an unexpectedly large B(E2; 4+ → 2+) transition strength was deduced, which is not reproduced by the shell-model calculations.

Keywords: physics; nuclear physics; neutrons; isotopes; measurement; spectroscopy

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Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2

Last updated on 2022-20-09 at 15:35