New sub-\mu s isomers in 125,127,129Sn and isomer systematics of 124-130 Sn

New sub-\mu s isomers in 125,127,129Sn and isomer systematics of 124-130 Sn

Lozeva, R. L.; Simpson, G. S.; Grawe, H.; Neyens, G.; Atanasova, L. A.; Balabanski, D. L.; Bazzacco, D.; Becker, F.; Bednarczyk, P.; Benzoni, G.; Blasi, N.; Blazhev, A.; Bracco, A.; Brandau, C.; Caceres, L.; Camera, F.; Chamoli, S. K.; Crespi, F. C. L.; Daugas, J.-M.; Detistov, P.; de Rydt, M.; Doornenbal, P.; Fahlander, C.; Farnea, E.; Georgiev, G.; Gerl, J.; Gladnishki, K. A.; Gorska, M.; Grebosz, J.; Hass, M.; Hoischen, R.; Ilie, G.; Ionescu-Bujor, M.; Iordachescu, A.; Jolie, J.; Jungclaus, A.; Kmiecik, M.; Kojouharov, I.; Kurz, N.; Lakshmi, S. P.; Lo Bianco, G.; Mallion, S.; Maj, A.; Montanari, D.; Perru, O.; Pfützner, M.; Pietri, S.; Pinston, J. A.; Podolyak, Z.; Prokopowicz, W.; Rudolph, D.; Rusev, G.; Saitoh, T. R.; Saltarelli, A.; Schaffner, H.; Schwengner, R.; Tashenov, S.; Turzo, K.; Valiente-Dobon, J. J.; Vermeulen, N.; Walker, J.; Werner-Malento, E.; Wieland, O.; Wollersheim, H.-J.

New sub-\mu s isomers have been observed in the neutron-rich Sn isotopes. 125,127,129Sn nuclei have been produced in a relativistic fission reaction of 238U on a 9Be target at 750 A MeV and by the fragmentation of 136Xe at 600 A MeV populating high-spin yrast states. In addition to the already known \mu s isomers, three new ones -1 with sub-\mu s half-lives have been observed. These yrast isomers are the high-spin members
of the \nu (d_3/2^-1 h_11/2^-2 ) and \nu h_11/2 ^-n, seniority v = 3 multiplets leading to isomeric (23/2+) and (27/2-) states, respectively. Added to the already known 19/2+ \mu s isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h_11/2 orbital a t N = 82.
The results are discussed in the framework of state-of-the -art shell-model calculations using realistic interactions.

Keywords: Nuclear structure; isomers; radioactive ion beams; shell model

Permalink: https://www.hzdr.de/publications/Publ-11443