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Physical Review C, Nuclear Physics

Publication date: 2008-06-01
Volume: 77 15
Publisher: Published for the American Physical Society by the American Institute of Physics

Author:

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

Keywords:

125-129Sn isomers, heavy-ion collisions, gamma-ray, relativistic U-fission, isomer lifetimes, transition-probabilities, yrast isomers, g-RISING, energy-levels, beta-decay, isotopes, nuclei, gsi, detectors, Science & Technology, Physical Sciences, Physics, Nuclear, Physics, GAMMA-RAY, TRANSITION-PROBABILITIES, NUCLEAR-STRUCTURE, YRAST ISOMERS, ENERGY-LEVELS, BETA-DECAY, DETECTORS, SN-119, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

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.