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.; Nowacki, F.; Polettini, M.; Yaneva, A.; Ahmed, U.; Alhomaidhi, S.; Algora, A.; Appleton, C.; Arici, T.; Bagchi, S.; Benzoni, G.; Benito, J.; Blazhev, A.; Boutachkov, P.; Bracco, A.; Bruce, A. M.; Brunet, M.; Canavan, R.; Davinson, T.; Dickel, T.; Esmaylzadeh, A.; Fraile, L. M.; Haettner, E.; Hall, O.; Haefner, G.; Heggen, H.; Hornung, Ch.; Hucka, J. P.; John, P. R.; Kahl, D.; Karayonchev, V.; Kern, R.; Knoebel, R.; Korgul, A.; Kosir, G.; Kojouharov, I.; Kostyleva, D.; Kuzminchuk, N.; Kurz, N.; Liotta, R.; Lozeva, R.; Mikolajczuk, M.; Mukha, I; Napiralla, P.; Page, R.; Petrache, C. M.; Pietralla, N.; Pietri, S.; Plass, W. R.; Podolyak, Zs.; Regis, J. -m.; Rudigier, M.; Roesch, H.; Ruotsalainen, P.; Sahin, E.; Sanchez-Tembleque, V.; Schaffner, H.; Scheidenberger, C.; Schirru, F.; Sexton, L.; Singh, B. S. Nara; Sharma, A.; Shearman, R.; Si, M.; Tanaka, Y. K.; Vasiljevic, J.; Vesic, J.; Vilhena, J.; Weick, H.; Wollersheim, H. J.; Werner, V.; Wiederhold, J.; Witt, W.; Woods, P. J.; Zimba, G.; Zhao, J.

Publication year: 2024

Journal: Physical Review Research

Volume number: 6

Issue number: 2

eISSN: 2643-1564

DOI Link: https://doi.org/10.1103/PhysRevResearch.6.L022038

Publisher: American Physical Society

Abstract: 
Lifetime measurements of low-lying excited states in the semimagic ( N = 50) nucleus 95 Rh have been performed by means of the fast -timing technique. The experiment was carried out using gamma -ray detector arrays consisting of LaBr 3 (Ce) scintillators and germanium detectors integrated into the DESPEC experimental setup commissioned for the Facility for Antiproton and Ion Research ( FAIR ) Phase -0, Darmstadt, Germany. The excited states in 95 Rh were populated primarily via the /3 decays of 95 Pd nuclei, produced in the projectile fragmentation of a 850 MeV / nucleon 124 Xe beam impinging on a 4 g / cm 2 9 Be target. The deduced electromagnetic E2 transition strengths for the gamma -ray cascade within the multiplet structure depopulating from the isomeric I pi = 21 / 2 + state are found to exhibit strong deviations from predictions of standard shell model calculations which feature approximately conserved seniority symmetry. In particular, the observation of a strongly suppressed E2 strength for the 13 / 2 + -> 9 / 2 + ground state transition cannot be explained by calculations employing standard interactions. This remarkable result may require revision of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations, and might also point to the need for including three-body forces in the Hamiltonian.

Harvard Citation style: Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P., Aktas, O., et al. (2024) Broken seniority symmetry in the semimagic proton mid-shell nucleus ⁹⁵Rh, Physical Review Research, 6(2), Article L022038. https://doi.org/10.1103/PhysRevResearch.6.L022038

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., Nowacki, F., Polettini, M., Yaneva, A., Ahmed, U., Alhomaidhi, S., ...Zhao, J. (2024). Broken seniority symmetry in the semimagic proton mid-shell nucleus ⁹⁵Rh. Physical Review Research. 6(2), Article L022038. https://doi.org/10.1103/PhysRevResearch.6.L022038