Influence of octupole vibration on the low-lying structure of $^{251}$Fm and other heavy $N=151$ isotones

Autor: Rezynkina, K., Lopez-Martens, A., Hauschild, K., Deloncle, I., Péru, S., Brionnet, P., Chelnokov, M.L., Chepigin, V.I., Dorvaux, O., Déchery, F., Faure, H., Gall, B., Isaev, A.V., Izosimov, I.N., Katrasev, D.E., Kuznetsov, A.N., Kuznetsova, A.A., Malyshev, O.N., Popeko, A.G., Popov, Y.A., Sokol, E.A., Svirikhin, A.I., Yeremin, A.V.
Přispěvatelé: Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Physical Review C
Physical Review C, American Physical Society, 2018, 97 (5), pp.054332. ⟨10.1103/PhysRevC.97.054332⟩
Phys.Rev.C
Phys.Rev.C, 2018, 97 (5), pp.054332. ⟨10.1103/PhysRevC.97.054332⟩
ISSN: 2469-9985
2469-9993
DOI: 10.1103/PhysRevC.97.054332⟩
Popis: International audience; The structure of low-lying excited states in Fm251, populated by the α decay of No255, has been investigated by means of combined γ and internal conversion electron spectroscopy. The values for the internal conversion coefficients for the 1/2+→5/2+ and 5/2+→9/2− transitions have been measured. The determined M2/E3 mixing ratio and lifetime for the 5/2+ decay to the ground state allowed to determine the corresponding reduced transitions strengths of B(E3)=18(6) W.u. and B(M2)=3.0(6)×10−3 W.u. These results, as well as the results of previous studies in N=151 isotopes, are compared to theoretical calculations beyond the mean-field approach, including the first QRPA calculations using the Gogny D1M parametrization for such heavy odd-N nuclei. The comparison points to the importance of accounting for the octupole vibrations for a proper understanding of the low-lying nuclear structure of some of the heaviest elements.
Databáze: OpenAIRE
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