A1 Journal article (refereed)
Low-spin excitations in 89Br populated in β−decay of 89Se (2022)

Rząca-Urban, T., Sieja, K., Czerwiński, M., Kurpeta, J., Pomorski, M., Urban, W., Wiśniewski, J., Wróblewski, M., Canete, L., Eronen, T., Geldhof, S., Jokinen, A., Kankainen, A., Moore, I. D., Nesterenko, D., Penttilä, H., Pohjalainen, I., Rinta-Antila, S., de Roubin, A., & Vilén, M. (2022). Low-spin excitations in 89Br populated in β−decay of 89Se. Physical Review C, 106(2), Article 024322. https://doi.org/10.1103/PhysRevC.106.024322

JYU authors or editors

Canete, Laetitia
Eronen, Tommi
Geldhof, Sarina
Jokinen, Ari
Kankainen, Anu
Moore, Iain
Nesterenko, Dmitrii
Penttilä, Heikki
Pohjalainen, Ilkka
Rinta-Antila, Sami
Vilén, Markus

Publication details

All authors or editors: Rząca-Urban, T.; Sieja, K.; Czerwiński, M.; Kurpeta, J.; Pomorski, M.; Urban, W.; Wiśniewski, J.; Wróblewski, M.; Canete, L.; Eronen, T.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2022

Publication date: 18/08/2022

Volume: 106

Issue number: 2

Article number: 024322

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.106.024322

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/82746

Abstract

Low-spin, excited states of the 89Br nucleus, populated in β− decay of 89Se have been studied for the first time. The 89Se nuclei were produced in proton-induced fission of natural thorium using the IGISOL facility and separated using a dipole magnet and the coupled JYFLTRAP Penning trap. Gamma radiation following the β− decay of 89Se was measured with an array of high-resolution germanium detectors. Levels scheme of 89Br was extended by 12 new levels and 31 new γ transitions. Spin-parity (3/2+) has been proposed for the ground state of the 89Se mother nucleus, replacing the (5/2+) assignment reported in data bases. The observed Gamow-Teller β− transition to the 1754.5-keV level indicates a πg9/2-based configuration. The level scheme of 89Br has been compared to large scale shell-model calculations. Excitations based on πp3/2 and πf5/2 single-particle levels as well as their anomalous coupling are proposed to explain the low-energy excitation scheme of 89Br.

Keywords: nuclear physics; astrophysics

Free keywords: IGISOL

Fields of science: