Short-lived isomers in $^{192}\mathrm{Po}$ and $^{194}\mathrm{Po}$

Short-lived isomers in ${}^{192}{Po}$ and ${}^{194}{Po}$

B. Andel, A. N. Andreyev, S. Antalic, F. P. Heßberger, D. Ackermann, S. Hofmann, M. Huyse, Z. Kalaninová, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, K. Nishio, R. D. Page, B. Sulignano, and P. Van Duppen

Phys. Rev. C 93, 064316 – Published 17 June 2016

Abstract

Isomeric states in ${}^{194}{Po}$ and ${}^{192}{Po}$ were studied at the velocity filter SHIP. The isotopes were produced in the fusion-evaporation reactions ${}^{141}\Pr$ ( ${}^{56}{Fe}, p 2 n) {}^{194}{Po}$ and ${}^{144}{Sm}$ ( ${}^{51}V, p 2 n) {}^{192}{Po}$ . Several new $γ$ -ray transitions were attributed to the isomers and $γ - γ$ coincidences for both isomers were studied for the first time. The 459-keV transition earlier, tentatively proposed as de-exciting the isomeric level in ${}^{194}{Po}$ , was replaced by a new 248-keV transition, and the spin of this isomer was reassigned from ( $11^{-}$ ) to ( $10^{-}$ ). The de-excitation of the ( $11^{-}$ ) isomeric level in ${}^{192}{Po}$ by the 154-keV transition was confirmed and a parallel de-excitation by a 733-keV ( $E 3$ ) transition to ( $8^{+}$ ) level of the ground-state band was suggested. Moreover, side feeding to the ( $4^{+}$ ) level of the ground-state band was proposed. The paper also discusses strengths of transitions de-exciting $11^{-}$ isomers in neighboring Po and Pb isotopes.

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Received 18 April 2016

DOI:https://doi.org/10.1103/PhysRevC.93.064316

Physics Subject Headings (PhySH)

Electromagnetic transitions Energy levels Isomer decays Lifetimes & widths

190 ≤ A ≤ 219

Nuclear Physics

Authors & Affiliations

B. Andel^1,*, A. N. Andreyev^2,3, S. Antalic¹, F. P. Heßberger^4,5, D. Ackermann^4,†, S. Hofmann^4,6, M. Huyse⁷, Z. Kalaninová^1,‡, B. Kindler⁴, I. Kojouharov⁴, P. Kuusiniemi^4,§, B. Lommel⁴, K. Nishio³, R. D. Page⁸, B. Sulignano^4,∥, and P. Van Duppen⁷

¹Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
²Department of Physics, University of York, York YO10 5DD, United Kingdom
³Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
⁴GSI-Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁵Helmholtz Institut Mainz, 55099 Mainz, Germany
⁶Institut für Physik, Goethe-Universität Frankfurt, 60438 Frankfurt, Germany
⁷KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
⁸Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom

^*boris.andel@fmph.uniba.sk
^†Present address: GANIL, 14074 Caen, France.
^‡Present address: Laboratory of Nuclear Problems, JINR, 141980 Dubna, Russia.
^§Present address: Oulu Southern Institute and Department of Physics, University of Oulu, Finland.
^∥Present address: CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France.

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Vol. 93, Iss. 6 — June 2016

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Physical Review C

covering nuclear physics

Short-lived isomers in ${}^{192}{Po}$ and ${}^{194}{Po}$

B. Andel, A. N. Andreyev, S. Antalic, F. P. Heßberger, D. Ackermann, S. Hofmann, M. Huyse, Z. Kalaninová, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, K. Nishio, R. D. Page, B. Sulignano, and P. Van Duppen

Phys. Rev. C 93, 064316 – Published 17 June 2016

Abstract

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Physical Review C

covering nuclear physics

Short-lived isomers in Po192 and Po194

B. Andel, A. N. Andreyev, S. Antalic, F. P. Heßberger, D. Ackermann, S. Hofmann, M. Huyse, Z. Kalaninová, B. Kindler, I. Kojouharov, P. Kuusiniemi, B. Lommel, K. Nishio, R. D. Page, B. Sulignano, and P. Van Duppen

Phys. Rev. C 93, 064316 – Published 17 June 2016

Abstract

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Short-lived isomers in ${}^{192}{Po}$ and ${}^{194}{Po}$