Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W



Briscoe, AD, Page, RD, Uusitalo, J, Joss, DT, AlAqeel, MAM, Alayed, B, Andel, B, Antalic, S, Auranen, K, Ayatollahzadeh, H
et al (show 54 more authors) (2023) Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W. Physics Letters B, 847. p. 138310.

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Abstract

The radioactivity of 76160Os84 and 74156W82 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 = 97−32+97 μs) and its isomeric state (Eα = 8890(10) keV, t1/2 = 41−9+15 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 73156Ta83 of 333−22+25 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 157−34+57 ms.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Dec 2023 10:27
Last Modified: 14 Dec 2023 10:28
DOI: 10.1016/j.physletb.2023.138310
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3177389