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Claes Fahlander

Professor emeritus

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Coulomb excitation of Sn-110 using REX-ISOLDE

Author

  • Andreas Ekström
  • Joakim Cederkäll
  • A. Hurst
  • Claes Fahlander
  • A. Banu
  • P. Butler
  • J. Eberth
  • M. Gorska
  • D. Habs
  • M. Huyse
  • O. Kester
  • O. Niedermayer
  • T. Nilsson
  • M. Pantea
  • H. Scheit
  • D. Schwalm
  • G. Sletten
  • D. P. Ushasi
  • P. van Duppen
  • N. Warr
  • D. Weisshaar
Show all

Summary, in English

In this paper, we report the preliminary result from the first Coulomb excitation experiment at REX-ISOLDE (Habs et al 1998 Nucl. Instrum. Methods B 139 128) using neutron-deficient Sn-beams. The motivation of the experiment is to deduce the reduced transition probability, B(E2; 2(+) -> 0(+)), for the sequence of neutron deficient, unstable, even-even Sn- isotopes from Sn-110 to ultimately Sn-110. Safe Coulomb excitation using a radioactive beam opens up a new path to study the lifetime of the first excited 2(+) state in these isotopes. The de-excitation path following fusion-evaporation reactions will for the even-even Sn isotopes pass via an isomeric 6(+) state, located at higher energy, which thus hampers measurements of the lifetime of the first excited state using, e. g., recoil-distance methods. For this reason the reduced transition probability of the first excited 2(+) state has remained unknown in this chain of isotopes although the B(E2) value of the stable isotope Sn-112 was measured approximately 30 years ago (see, e. g., Stelson et al 1970 Phys. Rev. C 2 2015). Our experiment is thus the first to accomplish a measurement of this quantity in Sn-110. It is believed that the determination of the B(E2) value in Sn-110 will indicate the turnover point from a trend of increasing B(E2) values for the heavier isotopes to a trend characterized by less collectivity. Our first preliminary result indicates that this assumption may well be correct.

Department/s

  • Nuclear physics

Publishing year

2006

Language

English

Pages

190-191

Publication/Series

Physica Scripta

Volume

T125

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-8949