2023 Impact factor 2.6
Hadrons and Nuclei

Eur. Phys. J. A 11, 9-13 (2001)

A new $\mu$s isomer in 136Sb produced in the projectile fission of 238U

M.N. Mineva1, M. Hellström1, 2, M. Bernas3, J. Gerl2, H. Grawe2, M. Pfützner4, P.H. Regan5, M. Rejmund6, D. Rudolph1, F. Becker6, C.R. Bingham7, T. Enqvist8, B. Fogelberg9, H. Gausemel10, H. Geissel2, J. Genevey11, M. Górska2, R. Grzywacz7, K. Hauschild6, Z. Janas4, I. Kojouharov2, Y. Kopatch2, A. Korgul4, W. Korten6, J. Kurcewicz4, M. Lewitowicz12, R. Lucas6, H. Mach9, S. Mandal2, P. Mayet2, C. Mazzocchi2, 13, J.A. Pinston11, Zs. Podolyàk5, H. Schaffner2, Ch. Schlegel2, K. Schmidt2, K. Sümmerer2 and H.J. Wollersheim2

1  Division of Cosmic and Subatomic Physics, Lund University, SE-22100 Lund, Sweden
2  Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
3  Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay Cedex, France
4  Institute of Experimental Physics, Warsaw University, PL-00861, Poland
5  Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
6  CEA Saclay, DSM/DAPNIA/SPhN, F-91191 Gif-sur-Yvette Cedex, France
7  Department of Physics, University of Tennessee, Knoxville, TN 37996, USA
8  Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
9  Department of Radiation Science, Uppsala University, S-61182 Nyköping, Sweden
10  Department of Chemistry, University of Oslo, Blindern, N-0315 Oslo, Norway
11  Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, F-38026 Grenoble Cedex, France
12  Grand Accélérateur National d'Ions Lourds, BP 5027, F-14021 Caen Cedex, France
13  Università degli Studi di Milano, I-20133 Milano, Italy


(Received: 23 April 2001 Communicated by D. Schwalm )

The neutron-rich isotope 136Sb has been produced following the relativistic projectile fission of 238U in an experiment performed at the Fragment Separator at GSI, Darmstadt. Delayed $\gamma$-ray spectroscopy of the fission products has been performed after isotope separation. A new isomeric state in 136Sb has been populated, and its lifetime measured as T1/2=565 (50) ns. Realistic and empirical shell-model calculations have been performed and are compared to the experimental observables.

21.10.Tg - Lifetimes.
21.60.Cs - Shell model.
25.75.-q - Relativistic heavy-ion collisions.

© Società Italiana di Fisica, Springer-Verlag 2001