Journal article
Authors list: Das, B.; Cederwall, B.; Qi, C.; Gorska, M.; Regan, P. H.; Aktas, O.; Albers, H. M.; Banerjee, A.; Chishti, M. M. R.; Gerl, J.; Hubbard, N.; Jazrawi, S.; Jolie, J.; Mistry, A. K.; 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, J. P.; John, P. R.; Kojouharov, I; Knoebel, R.; Kostyleva, D.; Kuzminchuk, N.; Mukha, I; Plass, W. R.; Singh, B. S. Nara; Vasiljevic, J.; Pietri, S.; Podolyak, Zs; Rudigier, M.; Roesch, H.; Sahin, E.; Schaffner, H.; Scheidenberger, C.; Schirru, F.; Sharma, A.; Shearman, R.; Tanaka, Y.; Vesic, J.; Weick, H.; Wollersheim, H. J.; Ahmed, U.; Algora, A.; Appleton, C.; Benito, J.; Blazhev, A.; Bracco, A.; Bruce, A. M.; Brunet, M.; Canavan, R.; Esmaylzadeh, A.; Fraile, L. M.; Haefner, G.; Heggen, H.; Kahl, D.; Karayonchev, V; Kern, R.; Korgu, A.; Kosir, G.; Kurz, N.; Lozeva, R.; Mikolajczuk, M.; Napiralla, P.; Page, R.; Petrache, C. M.; Pietralla, N.; Regis, J-M; Ruotsalainen, P.; Sexton, L.; Sanchez-Temble, V; Si, M.; Vilhena, J.; Werner, V; Wiederhold, J.; Witt, W.; Woods, P. J.; Zimba, G.
Publication year: 2022
Journal: Physical Review C
Volume number: 105
Issue number: 3
ISSN: 2469-9985
eISSN: 2469-9993
Open access status: Hybrid
DOI Link: https://doi.org/10.1103/PhysRevC.105.L031304
Publisher: American Physical Society
Abstract:
Direct lifetime measurements via gamma -gamma 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 Ru-94. 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 Ru-94 were populated primarily via the beta-delayed proton emission of Pd-95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe-124 beam impinging on a 4 g/cm(2) Be-9 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 f pg proton hole space with respect to doubly magic Sn-100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority v = 2, I-pi = 4(+) state and that of a close-lying v = 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.
Citation Styles
Harvard Citation style: Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P., Aktas, O., et al. (2022) Nature of seniority symmetry breaking in the semimagic nucleus 94Ru, Physical Review C, 105(3), Article L031304. https://doi.org/10.1103/PhysRevC.105.L031304
APA Citation style: Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P., Aktas, O., Albers, H., Banerjee, A., Chishti, M., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, J., Arici, T., ...Zimba, G. (2022). Nature of seniority symmetry breaking in the semimagic nucleus 94Ru. Physical Review C. 105(3), Article L031304. https://doi.org/10.1103/PhysRevC.105.L031304
Keywords
DESPEC; EXCITED-STATES; LEVEL STRUCTURE; N=50 ISOTONES; PROTON
