Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W
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.; Forsberg, U.; Grahn, T.; Greenlees, P. T.; Hilton, J. B.; Illana, A.; Joukainen, H.; Judson, D. S.; Julin, R.; Jutila, H.; Keatings, J. M.; Labiche, M.; Leino, M.; Lewis, M. C.; Louko, J.; Luoma, M.; Martel, I.; McCarter, A.; McKee, P. P.; Mosat, P.; Nathaniel, S. N.; Neuvonen, O.; O'Donnell, D.; Ojala, J.; Page, C. A.A.; Plaza, A. M.; Pakarinen, J.; Papadakis, P.; Parr, E.; Partanen, J.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Saygi, B.; Smallcombe, J.; Smith, J. F.; Sorri, J.; Sullivan, C. M.; Szwec, S.; Tann, H.; Tolosa-Delgado, A.; Uusikylä, E.; Venhart, M.; Waring, L. J.; Zimba, G. (2023-12-10)
Elsevier
10.12.2023
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, 138310. https://doi.org/10.1016/j.physletb.2023.138310
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© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202312143755
https://urn.fi/URN:NBN:fi:oulu-202312143755
Tiivistelmä
Abstract
The radioactivity of Os84 and W82 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 ( = 7092(15) keV, = 97 μs) and its isomeric state ( = 8890(10) keV, = 41 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 Ta83 of 333 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 ms.
The radioactivity of Os84 and W82 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 ( = 7092(15) keV, = 97 μs) and its isomeric state ( = 8890(10) keV, = 41 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 Ta83 of 333 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 ms.
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