Eur. Phys. J. A 13, 449-460 (2002)
DOI: 10.1140/epja/iepja1111

Decay of the neutron-rich isotope to

J. Kurpeta¹, G. Lhersonneau², A. Plochocki¹, J.C. Wang², P. Dendooven², A. Honkanen², M. Huhta², M. Oinonen², H. Penttilä², K. Peräjärvi², J.R. Persson² and J. Äystö<sup>2, 3

1</sup>  Institute of Experimental Physics, Warsaw University, ul. Hoza 69, 00-681 Warszawa, Poland
²  Department of Physics, University of Jyväskylä, P.O. Box. 35, FIN-40351, Jyväskylä, Finland
³  EP-ISOLDE, CERN 23, CH-1211, Geneva, Switzerland

jkurpeta@mimuw.edu.pl

(Received: 18 January 2001 / Revised version: 29 November 2001 Communicated by C. Signorini)

Abstract
The decay of neutron-rich isotope ¹¹³Ru obtained as on-line mass separated product of proton-induced fission has been investigated by coincidence and spectrum multiscaling measurements. Decay schemes for both low- and high-spin isomers of ¹¹³Ru have been constructed. The level scheme of ¹¹³Rh is considerably extended. Systematics of the lowest-lying rhodium levels is smooth. The picture of shape coexistence established for neutron-rich Rh isotopes near-neutron midshell is confirmed with the observation of a K=1/2 deformed band, with its 3/2 ⁺ state at 600 keV being the lowest-lying level and of probable 7/2 ⁺ and 5/2 ⁺ band members. A large fraction of feeding is found to populate high-lying levels in ¹¹³Rh. The GT strength in ¹¹³Ru decay is significantly larger than for the decay of ¹¹³Ru and of lighter rhodium isotopes.

PACS
27.60.+j - 90 149.
23.20.Lv - Gamma transitions and level energies.

© Società Italiana di Fisica, Springer-Verlag 2002