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New sub-mu s isomers in Sn-125,Sn-127,Sn-129 and isomer systematics of Sn124-130

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

Abstract

<p>New sub-mu s isomers have been observed in the neutron-rich Sn isotopes. Sn-125,Sn-127,Sn-129 nuclei have been produced in a relativistic fission reaction of U-238 on a Be-9 target at 750 A.MeV and by the fragmentation of Xe-136 at 600 A.MeV populating high-spin yrast states. In addition to the already known mu s isomers, three new ones 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 at N = 82. The results are discussed in the framework of state-of-the-art shell-model calculations using realistic interactions.</p

Publisher: AMER PHYSICAL SOC
Year: 2008
DOI identifier: 10.1103/PhysRevC.77.064313
OAI identifier: oai:epubs.surrey.ac.uk:76

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