A1 Journal article (refereed)
Excited states in 87Br populated in β decay of 87Se (2019)


Wisniewski, J., Urban, W., Czerwinski, M., Kurpeta, J., Plochocki, A., Pomorski, M., Rzaca-Urban, T., Sieja, K., Canete, L., Eronen, T., Geldhof, S., Jokinen, A., Kankainen, A., Moore, I. D., Nesterenko, D. A., Penttilä, H., Pohjalainen, I., Rinta-Antila, S., de Roubin, A., & Vilén, M. (2019). Excited states in 87Br populated in β decay of 87Se. Physical Review C, 100(5), Article 054331. https://doi.org/10.1103/PhysRevC.100.054331


JYU authors or editors


Publication details

All authors or editors: Wisniewski, J.; Urban, W.; Czerwinski, M.; Kurpeta, J.; Plochocki, A.; Pomorski, M.; Rzaca-Urban, T.; Sieja, K.; Canete, L.; Eronen, T.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2019

Volume: 100

Issue number: 5

Article number: 054331

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.100.054331

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/66790


Abstract

Excited levels in 87Br, populated in β decay of 87Se, have been studied by means of γ-ray spectroscopy using an array of broad energy Ge detectors. 87Se nuclei were produced by irradiating a natural Th target with 25-MeV protons. Fission products were extracted from the target chamber using the IGISOL technique, then separated on a dipole magnet and Penning trap (JYFLTRAP) setup. The scheme of excited levels of 87Br has been significantly extended. 114 new transitions and 51 new levels were established. β feedings and log(ft) values of levels were determined. The upper limit for β feeding to the ground state of 87Br was determined to be 23(5)%. Ground state spin and parity 5/2− was confirmed, as suggested by previous studies. We also confirm the low-energy excited state at 6.02 keV. The ground state and two lowest excited states in 87Br were interpreted as the (πf5/2)3j,j−1,j−2 triplet produced by the so-called anomalous coupling. The 333.61- and 699.26-keV levels were interpreted as πp3/2 and πp1/2 single-particle excitations. The 9/2+ level reported previously as corresponding to the πg9/2 single-particle excitation is proposed to be an isomer with half-life 20 ns. Large-scale shell-model calculations performed in this work are in good agreement with experimental results.


Keywords: nuclear physics

Free keywords: beta decay; electromagnetic transitions; nuclear spin and parity; nuclear structure and decays; shell model


Contributing organizations


Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2


Last updated on 2023-10-01 at 12:56