Eur. Phys. J. A 13, 281-284 (2002)

Note

Selective laser ionization of indium isotopes: The new r-process nuclide

I. Dillmann¹, M. Hannawald¹, U. Köster², V.N. Fedoseyev², A. Wöhr³, B. Pfeiffer¹, D. Fedorov⁴, J. Shergur³, L. Weissman², W.B. Walters³ and K.-L. Kratz<sup>1

1</sup>  Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
²  CERN, CH-1211 Geneva 23, Switzerland
³  Department of Chemistry, University of Maryland, College Park, MD 20742, USA
⁴  Petersburg Nuclear Physics Institute, RUS-188350, Gatchina, Russia

kl.kratz@uni-mainz.de

(Received: 17 January 2002 Communicated by J. Äystö)

Abstract
Production yields and -decay half-lives ( T_1/2) of very neutron-rich indium isotopes were determined at CERN/ISOLDE using isobaric selectivity of a resonance-ionization laser ion-source. Beta-delayed neutron ( dn) multiscaling measurements have yielded improved T_1/2 for 206(6) ms ¹³²In, 165(3) ms ¹³³In and 141(5) ms ¹³⁴In. With 92(10) ms ¹³⁵In, a new r-process nuclide has been identified which acts as an important "waiting point" in the In isotopic chain for neutron densities in the range -10 ²⁶ n/cm ³, where the r-matter flow has already passed the abundance peak region.

PACS
21.10.Tg - Lifetimes.
27.60.+j - .
25.85.Ec - Neutron-induced fission.
32.80.Fb - Photoionization of atoms and ions.

© Società Italiana di Fisica, Springer-Verlag 2002