Nature of seniority symmetry breaking in the semimagic nucleus 94 Ru

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Das, B, Cederwall, B, Qi, C, Górska, M, Regan, PH, Aktas, Ö, Albers, HM, Banerjee, A, Chishti, MMR, Gerl, J et al (show 77 more authors) , Hubbard, N, Jazrawi, S, Jolie, J, Mistry, AK, Polettini, M, Yaneva, A, Alhomaidhi, S, Zhao, J, Arici, T, Bagchi, S, Benzoni, G, Boutachkov, P, Davinson, T, Dickel, T, Haettner, E, Hall, O, Hornung, Ch, Hucka, JP, John, PR, Kojouharov, I, Knöbel, R, Kostyleva, D, Kuzminchuk, N, Mukha, I, Plass, WR, Nara Singh, BS, Vasiljević, J, Pietri, S, Podolyák, Zs, Rudigier, M, Rösch, H, Sahin, E, Schaffner, H, Scheidenberger, C, Schirru, F, Sharma, A, Shearman, R, Tanaka, Y, Vesić, J, Weick, H, Wollersheim, HJ, Ahmed, U, Algora, A, Appleton, C, Benito, J, Blazhev, A, Bracco, A, Bruce, AM, Brunet, M, Canavan, R, Esmaylzadeh, A, Fraile, LM, Häfner, G, Heggen, H, Kahl, D, Karayonchev, V, Kern, R, Korgul, A, Kosir, G, Kurz, N, Lozeva, R, Mikolajczuk, M, Napiralla, P, Page, R ORCID: 0009-0009-7062-711X, Petrache, CM, Pietralla, N, Régis, J-M, Ruotsalainen, P, Sexton, L, Sanchez-Temble, V, Si, M, Vilhena, J, Werner, V, Wiederhold, J, Witt, W, Woods, PJ and Zimba, G (2022) Nature of seniority symmetry breaking in the semimagic nucleus 94 Ru. Physical Review C, 105 (3). l031304-.

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Abstract

Direct lifetime measurements via γ-γ coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N=50) nucleus Ru94. The experiment was carried out as the first in a series of "FAIR-0"experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in Ru94 were populated primarily via the β-delayed proton emission of Pd95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe124 beam impinging on a 4 g/cm2Be9 target. While the deduced E2 strength for the 2+→0+ transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4+→2+ transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the fpg proton hole space with respect to doubly magic Sn100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority ν=2, Iπ=4+ state and that of a close-lying ν=4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6+→4+ transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-The-Art theoretical model calculations.

Item Type:	Article
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	20 Apr 2022 10:38
Last Modified:	17 Mar 2024 13:42
DOI:	10.1103/physrevc.105.l031304
Open Access URL:	https://journals.aps.org/prc/pdf/10.1103/PhysRevC....
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3153446