g factor of the 7- isomer in 126Sn and first observation of spin-alignment in relativistic fission

Autor: H. Schaffner, H. J. Wollersheim, A. Jungclaus, M. Ionescu-Bujor, R. Lozeva, J. Gerl, M. Pfützner, Gary Simpson, W. Prokopowicz, J. M. Daugas, T.R. Saito, O. Perru, F. Becker, C. Brandau, S. K. Chamoli, M. De Rydt, S. Mallion, P. Bednarczyk, J. Jolie, I. Kojouharov, Michael Hass, N. Vermeulen, H. Grawe, A. Blazhev, N. Kurz, L. Caceres, Gerda Neyens, P. Doornenbal, A. Maj, G. Ilie, Zs. Podolyák, J. Walker, M. Górska, J. Grȩbosz, D. L. Balabanski, K. Turzó, M. Kmiecik, L. Atanasova, E. Werner-Malento
Přispěvatelé: Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Physics Letters B
Physics Letters B, Elsevier, 2010, 687, pp.305-309. ⟨10.1016/j.physletb.2010.03.033⟩
Physics Letters B, 2010, 687, pp.305-309. ⟨10.1016/j.physletb.2010.03.033⟩
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2010.03.033⟩
Popis: We report on the g factor measurement of the isomeric 7 − state ( E * = 2219 keV , T 1 / 2 = 5.9 ( 8 ) μs ) in the neutron-rich 126Sn nucleus. The nucleus was produced by the fission of a relativistic 238U beam and reaction products were selected by the FRS fragment separator at GSI. For the first time, spin-alignment was observed after relativistic fission. It was used to deduce the g factor of the 7 − isomeric state, g ( 7 − ) = − 0.098 ( 9 ) , from the measured perturbed angular distribution of its γ decay using the RISING Cluster detectors. The observed value confirms the suggested ν ( h 11 / 2 − 1 d 3 / 2 − 1 ) dominant configuration, which has been proposed for the 7 − isomers in neutron-rich Sn isotopes. The failure of the g factor additivity rule and the importance of core polarization evolution with increasing distance from the doubly-magic 132Sn is discussed. The first observation of 18(8)% of spin-alignment produced by the relativistic fission of a 238U beam paves the way to study moments of neutron-rich (sub-)microsecond isomers, which are difficult to align by other means.
Databáze: OpenAIRE
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