Decay of a microsecond seniority 3 isomeric state in 155Hf
Abstract
Excited states in the neutron-deficient nuclide 155 Hf have been investigated in experiments performed at the Accelerator Laboratory of the University of Jyväskylä. The 155 Hf nuclei were produced in fusion-evaporation reactions induced by beams of 295 and 315 MeV 58 Ni ions bombarding an isotopically enriched 102 Pd target and separated using the recoil mass separator MARA. An isomeric state having a half-life of 510(30) ns was discoveredand is interpreted as a seniority 𝜐=3, (𝜋ℎ211/2⊗𝜈𝑓7/2)27/2− configuration. The 𝛾-ray transitions emitted in the deexcitation of the isomeric state to the ground state were identified and a level scheme was constructed, from which the excitation energy of the isomer was determined to be 2581.5(10) keV. A 𝐵(𝐸2) value of 0.45(3) W.u. was deduced for the 105.4 keV transition depopulating the isomeric state. The deduced level scheme and 𝐵(𝐸2) value are compared with systematics and shell-model calculations.
Main Authors
Format
Articles
Research article
Published
2024
Series
Subjects
Publication in research information system
Publisher
American Physical Society
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202409115879Use this for linking
Review status
Peer reviewed
ISSN
2469-9985
DOI
https://doi.org/10.1103/physrevc.110.034303
Language
English
Published in
Physical Review C
Citation
- Alayed, B., Page, R. D., Joss, D. T., Uusitalo, J., Qi, C., Briscoe, A. D., AlAqeel, M.A. M., Andel, B., Antalic, S., Auranen, K., Ayatollahzadeh, H., Badran, H., Barber, L., Beeton, G., Birova, M., Bogdanoff, V., Cubiss J., G., Cullen, D. M., Deary, J., . . . Zimba, G. (2024). Decay of a microsecond seniority 3 isomeric state in 155Hf. Physical Review C, 110(3), Article 034303. https://doi.org/10.1103/physrevc.110.034303
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Funder(s)
Research Council of Finland
Funding program(s)
Academy Project, AoF
Akatemiahanke, SA
Additional information about funding
Financial support for this work was provided by the United Kingdom Science and Technology Facilities Council (STFC) through Grants No. ST/P004598/1, No. ST/V001027/1, and No. ST/V001035/1; the EU Seventh Framework Programme “Integrating Activities - Transnational Access,” Project No. 262010 (ENSAR); by the Slovak Research and Development Agency (Contracts No. APVV-22-0282 and No. APVV-20-0532) and Slovak Grant Agency VEGA (Contracts No. 1/0651/21 and No. 2/0067/21); by the Research and Development Operational Programme funded by the European Regional Development Fund, Project No. ITMS code 26210120023 (20%); by the U.S. DOE under Contract No.DE-AC02-05CH11231 (LBNL); and by the Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Programme at JYFL). T.G. acknowledges the support of the Academy of Finland, Contract No. 131665. J.P. and S.S. acknowledge the Academy of Finland (Finland) Grant No. 307685. M.V. acknowledges funding from the ESET Foundation (Slovakia).
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