New isomers in Pd-125(79) and Pd-127(81): Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N=82 shell closure

Watanabe, H.; Wang, H. K.; Lorusso, G.; Nishimura, S.; Xu, Z. Y.; Sumikama, T.; Soderstrom, P. -A.; Doornenbal, P.; Browne, F.; Gey, G.; Jung, H. S.; Taprogge, J.; Vajta, Zs.; Wu, J.; Yagi, A.; Baba, H.; Benzoni, G.; Chae, K. Y.; Crespi, F. C. L.; Fukuda, N.; Gernhauser, R.; Inabe, N.; Isobe, T.; Jungclaus, A.; Kameda, D.; Kim, G. D.; Kim, Y. K.; Kojouharov, I.; Kondev, F. G.; Kubo, T.; Kurz, N.; Kwon, Y. K.; Lane, G. J.; Lin, Z.; Moon, C. -B.; Montaner-Piza, A.; Moschner, K.; Naqvi, F.; Niikura, M.; Nishibata, H.; Nishimura, D.; Odahara, A.; Orlandi, R.; Patel, Z.; Podolyak, Zs.; Sakurai, H.; Schaffner, H.; Simpson, G. S.; Steiger, K.; Sun, Y.; Suzuki, H.; Takeda, H.; Wendt, A.; Yoshinaga, K.     «

Watanabe, H.; Wang, H. K.; Lorusso, G.; Nishimura, S.; Xu, Z. Y.; Sumikama, T.; Soderstrom, P. -A.; Doornenbal, P.; Browne, F.; Gey, G.; Jung, H. S.; Taprogge, J.; Vajta, Zs.; Wu, J.; Yagi, A.; Baba, H.; Benzoni, G.; Chae, K. Y.; Crespi, F. C. L.; Fukuda, N.; Gernhauser, R.; Inabe, N.; Isobe, T.; Jungclaus, A.; Kameda, D.; Kim, G. D.; Kim, Y. K.; Kojouharov, I.; Kondev, F. G.; Kubo, T.; Kurz, N.; Kwon, Y. K.; Lane, G. J.; Lin, Z.; Moon, C. -B.; Montaner-Piza, A.; Moschner, K.; Naqvi, F.; Niikura...     »

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in Pd-125(79) and Pd-127(81) studied using the EURICA gamma-ray spectrometer, following production via in-flight fission of a high-intensity U-238 beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) mu s have been assigned spins and parities of (23/2(+)) and (19/2(+)) in Pd-125 and Pd-127, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus Sn-132. (C) 2019 The Author(s). Published by Elsevier B.V.     «

The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in Pd-125(79) and Pd-127(81) studied using the EURICA gamma-ray spectrometer, following production via in-flight fission of a high-intensity U-238 beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns an...     »