2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 6, 167-174

In-beam $\gamma$-spectroscopy with relativistic radioactive ion beams

S. Wan1 - J. Gerl1 - J. Cub6 - J.M. Holeczek7 - P. Reiter5 - D. Schwalm2 - T. Aumann1 - K. Boretzky4 - W. Dostal4 - B. Eberlein4 - H. Emling1 - Ch. Ender2 - Th.W. Elze3 - H. Geissel1 - A. Grünschloß3 - R. Holzmann1 - N. Iwasa1 - M. Kaspar1,3 - A. Kleinböhl1,3 - O. Koschorrek2 - Y. Leifels1 - A. Leistenschneider3 - I. Peter1 - H. Schaffner1 - C. Scheidenberger1 - R. Schubart1 - R. Schubert1,3 - H. Simon6 - G. Stengel3 - A. Surowiec1 - H.J. Wollersheim1

1 Gesellschaft für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
2 Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
3 Institut für Kernphysik, Universität Frankfurt, 60486 Frankfurt, Germany
4 Institut für Kernchemie, Universität Mainz, 55029 Mainz, Germany
5 Sektion Physik der LMU München, Am Coulombwall 1, 85748 Garching, Germany
6 Institut für Kernphysik, Technische Universität Darmstadt, 64289, Germany
7 Instytut Fizyki, Uniwersytet Slaski, 40-007 Katowice, Poland

Received: 2 August 1999 Communicated by B. Povh

Abstract
This work demonstrates the feasibility of in-beam $\gamma$-spectroscopy employing radioactive ion beam species at relativistic energies of E $=210\sim280$ A$\cdot$MeV. Neutron-rich nuclei below 48Ca with neutron number between the two magic numbers 20 and 28 have been investigated. Using a Pb target, single step inelastic excitation originating mainly from Coulomb interaction takes place populating preferentially low-lying low-spin states and enabling the extraction of B(E2) values. On a C target, nucleon removal reactions are dominating and medium-spin states are populated thus offering spectroscopic information in neighboring nuclei. Cross sections of inelastic excitation are determined and compared to coupled-channels calculations. Two new states of the very neutron-rich nucleus 44Ar at 1.78(8) MeV and 2.61(16) MeV are deduced from $\gamma$-transitions.

PACS
25.60.+v reactions induced by unstable nuclei - 25.75.+r relativistic heavy ion collisions - 23.20.Lv gamma transitions and level energies - 27.40.+z 39 < A < 58 - 29.30.Kv X- and $\gamma$-ray spectroscopy


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