A1 Journal article (refereed)
Decay spectroscopy at the two-proton drip line : Radioactivity of the new nuclides 160Os and 156W (2023)

Briscoe, A.D., Page, R.D., Uusitalo, J., Joss, D.T., AlAqeel, M.A.M., Alayed, B., Andel, B., Antalic, S., Auranen, K., Ayatollahzadeh, H., Badran, H., Barber, L., Beeton, G., Birova, M., Bogdanoff, V., Clark, R. M., Cubiss, J. G., Cullen, D. M., Deary, J., . . . Zimba, G. (2023). Decay spectroscopy at the two-proton drip line : Radioactivity of the new nuclides 160Os and 156W. Physics Letters B, 847, Article 138310. https://doi.org/10.1016/j.physletb.2023.138310

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Publication details

All authors or editors: Briscoe, A.D.; Page, R.D.; Uusitalo, J.; Joss, D.T.; AlAqeel, M.A.M.; Alayed, B.; Andel, B.; Antalic, S.; Auranen, K.; Ayatollahzadeh, H.; et al.

Journal or series: Physics Letters B

ISSN: 0370-2693

eISSN: 1873-2445

Publication year: 2023

Publication date: 07/11/2023

Volume: 847

Article number: 138310

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.physletb.2023.138310

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/93005

Abstract

The radioactivity of 160 76Os84 and 156 74W82 that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyväskylä. The 160Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV 58Ni ions bombarding a 106Cd target. The 160Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The 𝛼 decays of the ground state of 160Os (𝐸𝛼 = 7092(15) keV, 𝑡1∕2 = 97+97 −32 μs) and its isomeric state (𝐸𝛼 = 8890(10) keV, 𝑡1∕2 = 41+15 −9 μs) were measured, allowing the excitation energy of the isomer to be determined as 1844(18) keV. These 𝛼-decay properties and the excitation energy of the isomer are compared with systematics. The 𝛼 decays were correlated with subsequent decays to investigate the 𝛽 decays of the ground state of 156W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, 156Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in 156 73Ta83 of 333+25 −22 ms was obtained in a separate experiment using the same experimental systems with a 102Pd target. This result was employed to improve the precision of the half-life determined for 156W, which was measured as 157+57 −34 ms.

Keywords: nuclear physics

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Ministry reporting: Yes

VIRTA submission year: 2023

JUFO rating: 3