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

S. Wan - et al.

EPJ

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. Kaspar^1,3 - A. Kleinböhl^1,3 - O. Koschorrek² - Y. Leifels¹ - A. Leistenschneider³ - I. Peter¹ - H. Schaffner¹ - C. Scheidenberger¹ - R. Schubart¹ - R. Schubert^1,3 - 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

12 Internat. Congress of the Balkan Physical Union
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In-beam -spectroscopy with relativistic radioactive ion beams

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