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First Observation of the Decay of a 15- Seniority v=4 Isomer in 128Sn

Pietri, S. ; Jungclaus, A. ; Gorska, M. ; Grawe, H. ; Pfuetzner, M. ; Caceres, L. ; Detistov, P. ; Lalkovski, S. ; Modamio, V. and Podolyak, Z. , et al. (2011) In Physical Review C (Nuclear Physics) 83(4).
Abstract
Isomeric states in the semimagic Sn128-130 isotopes were populated in the fragmentation of a Xe-136 beam on a Be-9 target at an energy of 750 A.MeV. The decay of an isomeric state in Sn-128 at an excitation energy of 4098 keV has been observed. Its half live has been determined to be T-1/2 = 220(30) ns from the time distributions of the delayed gamma rays emitted in its decay. gamma gamma coincidence relations were analyzed in order to establish the decay pattern of the newly established state toward the known (7(-)) and (10(+)) isomers at excitation energies of 2092 and 2492 keV, respectively. Based on a comparison with results of state-of-the-art shell-model calculations the new isomeric state is proposed to have the nu... (More)
Isomeric states in the semimagic Sn128-130 isotopes were populated in the fragmentation of a Xe-136 beam on a Be-9 target at an energy of 750 A.MeV. The decay of an isomeric state in Sn-128 at an excitation energy of 4098 keV has been observed. Its half live has been determined to be T-1/2 = 220(30) ns from the time distributions of the delayed gamma rays emitted in its decay. gamma gamma coincidence relations were analyzed in order to establish the decay pattern of the newly established state toward the known (7(-)) and (10(+)) isomers at excitation energies of 2092 and 2492 keV, respectively. Based on a comparison with results of state-of-the-art shell-model calculations the new isomeric state is proposed to have the nu h(11/2)(-3)d(3/2)(-1) configuration with the four neutron holes in Sn-132 maximally aligned to a total spin of I-pi = 15(-). (Less)
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@article{2666fa48-9623-45b3-a484-7583afe36103,
  abstract     = {Isomeric states in the semimagic Sn128-130 isotopes were populated in the fragmentation of a Xe-136 beam on a Be-9 target at an energy of 750 A.MeV. The decay of an isomeric state in Sn-128 at an excitation energy of 4098 keV has been observed. Its half live has been determined to be T-1/2 = 220(30) ns from the time distributions of the delayed gamma rays emitted in its decay. gamma gamma coincidence relations were analyzed in order to establish the decay pattern of the newly established state toward the known (7(-)) and (10(+)) isomers at excitation energies of 2092 and 2492 keV, respectively. Based on a comparison with results of state-of-the-art shell-model calculations the new isomeric state is proposed to have the nu h(11/2)(-3)d(3/2)(-1) configuration with the four neutron holes in Sn-132 maximally aligned to a total spin of I-pi = 15(-).},
  author       = {Pietri, S. and Jungclaus, A. and Gorska, M. and Grawe, H. and Pfuetzner, M. and Caceres, L. and Detistov, P. and Lalkovski, S. and Modamio, V. and Podolyak, Z. and Regan, P. H. and Rudolph, Dirk and Walker, J. and Werner-Malento, E. and Bednarczyk, P. and Doornenbal, P. and Geissel, H. and Gerl, J. and Grebosz, J. and Kojouharov, I. and Kurz, N. and Prokopowicz, W. and Schaffner, H. and Wollersheim, H. J. and Andgren, K. and Benlliure, J. and Benzoni, G. and Bruce, A. M. and Casarejos, E. and Cederwall, B. and Crespi, F. C. L. and Hadinia, B. and Hellström, Margareta and Hoischen, Robert and Ilie, G. and Khaplanov, A. and Kmiecik, M. and Kumar, R. and Maj, A. and Mandal, S. and Montes, F. and Myalski, S. and Simpson, G. and Steer, S. J. and Tashenov, S. and Wieland, O.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {First Observation of the Decay of a 15- Seniority v=4 Isomer in 128Sn},
  url          = {https://lup.lub.lu.se/search/files/3261427/4067308.pdf},
  doi          = {10.1103/PhysRevC.83.044328},
  volume       = {83},
  year         = {2011},
}