Eur. Phys. J. A (2007) 31: 267-272
https://doi.org/10.1140/epja/i2006-10236-0

Regular Article - Nuclear Structure and Reactions

Production cross-sections of proton-rich ⁷⁰Ge fragments and the decay of ⁵⁷Zn and ⁶¹Ge

¹ Centre d'Etudes Nucléaires de Bordeaux Gradignan - UMR 5797 CNRS/IN2P3, Université Bordeaux 1, Chemin du Solarium, BP 120, 33175, Gradignan Cedex, France
² Institute of Atomic Physics, P.O. Box MG6, Bucharest-Margurele, Romania
³ Grand Accélérateur National d'Ions Lourds, B.P. 55027, F-14076, Caen Cedex 05, France
⁴ DAPNIA, CEA Saclay, F-91191, Gif-sur-Yvette Cedex, France

^* e-mail: blank@cenbg.in2p3.fr

Received: 10 July 2006
Accepted: 10 February 2007
Published online: 5 March 2007

Abstract

Proton-rich isotopes of zinc and germanium, ⁵⁷Zn and ⁶¹Ge, have been produced by fragmentation of a ⁷⁰Ge beam at the LISE3 facility of GANIL. Their main decay characteristics have been studied after implantation in a double-sided silicon strip detector. In addition, the production cross-sections of proton-rich isotopes in the copper-to-germanium region have been determined. These cross-sections are much lower than predicted by the EPAX formula. These findings question to some extent the production rates expected for present and future fragmentation facilities.