Approaching 100Sn: Structural evolution in 98,100Cd via lifetime measurements

Zhang, G.; Polettini, M.; Mengoni, D.; Benzoni, G.; Huang, Z.; Gorska, M.; Blazhev, A.; Fraile, L. M.; Gargano, A.; De Gregorio, G.; Nowacki, F.; Aggez, G.; Ahmed, U.; Aktas, O.; Al-Aqeel, M.; Alayed, B.; Albers, H. M.; Algora, A.; Alhomaidhi, S.; Amjad, F.; Appleton, C.; Arici, T.; Armstrong, M.; Arnes, B. Q.; Astier, A.; Balogh, M.; Banerjee, A.; Bazzacco, D.; Benito Garcia, J.; Bottoni, S.; Boutachkov, P.; Bracco, A.; Bruce, A.; Brugnara, D.; Bruno, C.; Camera, F.; Cederwall, B.; Cicerchia, M.; Chishti, M. M. R.; Corsi, A.; Cortes, M. L.; Cox, D.; Crespi, F. C. L.; Das, B.; Davidson, T.; De Angelis, G.; Dickel, T.; Doncel, M.; Ertoprak, A.; Esmaylzadeh, A.; Gaffney, L.; Galtarossa, F.; Gamba, E. R.; Garbe, J.; Genna, D.; Gerl, J.; Goasduff, A.; Gottardo, A.; Gozzelino, A.; Grahn, T.; Ha, J.; Haettner, E.; Hall, O.; Harkness-Brennan, L.; Heggen, H.; Hornung, C.; Hrabar, Y.; S. P., Hu; Hubbard, N.; Ide, K. E.; Illana, A.; Jazrawi, S.; John, P. R.; Jolie, J.; Jones, C.; Joss, D.; Judson, D.; Karayonchev, V.; Kazantseva, E.; Kern, R.; Kiss, G. G.; Knafla, L.; Knobel, R.; Kojouharov, I.; Korgul, A.; Korten, W.; Koseoglou, P.; Kostyleva, D.; Kurtukian-Nieto, T.; Kosir, G.; Kurz, N.; Kuti, I.; Labiche, M.; Lenzi, S. M.; Leoni, S.; G. -S., Li; Liu, Z.; Llanos Exposito, M.; Lozeva, R.; J. B., Lu; Luoma, M.; Mantovani, G.; Marchi, T.; Mazzocco, M.; Menegazzo, R.; Mertzimekis, T. J.; Mikolajczuk, M.; Million, B.; Mistry, A. K.; Mukha, I.; Nacher, E.; Napoli, D. R.; Nara Singh, B. S.; Orrigo, S. E. A.; Page, R. D.; Papadakis, P.; Pasqualato, G.; Pellumaj, J.; Pelonis, S.; Perez Vidal, R. M.; Petrache, C. M.; Petrovic, J.; Pietralla, N.; Pietri, S.; Pigliapoco, S.; Podolyak, Z.; Porzio, C.; Raggio, A.; Recchia, F.; Regan, P. H.; Regis, J. M.; Reiter, P.; Rezynkina, K.; Rocco, E.; Rodriguez Murias, J.; Rosch, H.; Roy, P.; Rubio, B.; Rudigier, M.; Ruotsalainen, P.; Sahin, E.; Sarmiento, L. G.; Satrazani, M. -M.; Schaffner, H.; Scheidenberger, C.; Sexton, L.; Sharma, A.; Siciliano, M.; Simpson, J.; Smallcombe, J.; Soderstrom, P.; Sohler, D.; Sood, A.; Soramel, F.; Sun, B. -H.; Sun, H. B.; Sveiczer, A.; Szegedi, N.; Tanaka, Y. K.; Valiente-Dobon, J. J.; Vasileiou, P.; Vesic, J.; Von Tresckow, M.; Waring, L.; Watanabe, H.; Weick, H.; Werner, V.; Wiederhold, J.; Wieland, O.; Wimmer, K.; Wollersheim, H. -J.; Woods, P.; Wu, J.; Yaneva, A.; Zanon, I.; Zhao, J.; Zhang, H. Q.; Zhang, G. L.; Zheng, K. K.; Zhu, L. H.; Zidarova, R.; Ziliani, S.; Zyriliou, A.

doi:10.1016/j.physletb.2025.139378

The lifetimes of low-lying excited states below the 8+ seniority isomer were directly measured using fast timing detectors in the neutron-deficient isotopes 98,100Cd. This experiment was conducted with the DEcay SPECtroscopy (DESPEC) setup at GSI, where the ions of interest were produced via a fragmentation reaction and identified using the FRagment Separator (FRS) before being implanted in the AIDA active stopper system, and the γ rays emitted during the de-excitation of isomeric states were detected by the LaBr3 FATIMA Array. The newly deduced values for the reduced transition probabilities were compared with shell-model calculations using different interactions and effective charges. The results indicate that, while 98Cd aligns well with a seniority scheme description, in 100Cd the transition strengths among low-lying states are not fully reproduced, and the nature of these states remains an open problem within the present theoretical description. Ultimately, a key element in the description of this region, crucial for nuclear physics and astrophysics, appears to be the proton-neutron term of the nuclear effective interaction.