2023 Impact factor 2.6
Hadrons and Nuclei

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


Selective laser ionization of $\mth{N\ge 82}$ indium isotopes: The new r-process nuclide $\chem{^{135}In}$

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. Kratz1

1  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


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

Production yields and $\beta$-decay half-lives ( T1/2) of very neutron-rich indium isotopes were determined at CERN/ISOLDE using isobaric selectivity of a resonance-ionization laser ion-source. Beta-delayed neutron ( $\beta$dn) multiscaling measurements have yielded improved T1/2 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 $n_{\rm n}\simeq 10^{24}$-10 26 n/cm 3, where the r-matter flow has already passed the $A\simeq 130$ abundance peak region.

21.10.Tg - Lifetimes.
27.60.+j - $90 \le A \le 149$ .
25.85.Ec - Neutron-induced fission.
32.80.Fb - Photoionization of atoms and ions.

© Società Italiana di Fisica, Springer-Verlag 2002