Eur. Phys. J. A (2010) 44: 355-361
https://doi.org/10.1140/epja/i2010-10945-7

Regular Article - Experimental Physics

Coulomb excitation of the odd-odd isotopes ^{106, 108}In

¹ Physics Department, University of Lund, Box 118, SE-221 00, Lund, Sweden
² PH Department, CERN, 1211, Geneva 23, Switzerland
³ Physics Department and Center of Mathematics for Applications, University of Oslo, Oslo, Norway
⁴ Institute of Nuclear Physics, University of Cologne, Cologne, Germany
⁵ Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
⁶ Department of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
⁷ CEA Saclay, Service de Physique Nucléaire, Gif-sur-Yvette, France
⁸ Gesellschaft für Schwerionenforschung, Darmstadt, Germany
⁹ Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium
¹⁰ Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland
¹¹ Institut Laue Langevin, 6 rue Jules Horowitz, 38042, Grenoble, France
¹² Department of Physics, University of Manchester, Manchester, UK
¹³ AB Department, CERN, 1211, Geneva 23, Switzerland
¹⁴ Institute of Experimental Physics, University of Warsaw, Warsaw, Poland
¹⁵ Department of Physics, University of Oslo, Oslo, Norway
¹⁶ Physics Department, University of Copenhagen, Copenhagen, Denmark

^* e-mail: andreas.ekstrom@nuclear.lu.se

Received: 30 November 2009
Revised: 19 January 2010
Accepted: 1 March 2010
Published online: 20 April 2010

Abstract

The low-lying states in the odd-odd and unstable isotopes ^{106, 108}In have been Coulomb excited from the ground state and the first excited isomeric state at the REX-ISOLDE facility at CERN. With the additional data provided here the g _9/2 ^-1 ⊗ d _5/2 and g _9/2 ^-1 ⊗ g _7/2 multiplets have been re-analyzed and are modified compared to previous results. The observed -ray de-excitation patterns were interpreted within a shell model calculation based on a realistic effective interaction. The agreement between theory and experiment is satisfactory and the calculations reproduce the observed differences in the excitation pattern of the two isotopes. The calculations exclude a 6⁺ ground state in ¹⁰⁶In . This is in agreement with the conclusions drawn using other techniques. Furthermore, based on the experimental results, it is also concluded that the ordering of the isomeric and ground state in ¹⁰⁸In is inverted compared to the shell model prediction. Limits on B(E2) values have been extracted where possible. A previously unknown low-lying state at 367keV in ¹⁰⁶In is also reported.