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Penning-trap-assisted study of ¹¹⁵Ru beta decay

¹ Department of Physics, University of Jyväskylä, P.O.B. 35, FIN-40014, Jyväskylä, Finland
² Faculty of Physics, University of Warsaw, ul. Hoża 69, 00-681, Warsaw, Poland
³ Institut Laue-Langevin, 6 rue J. Horowitz, F-38042, Grenoble, France

^* e-mail: juho.j-a.rissanen@jyu.fi

Received: 8 March 2011
Revised: 11 July 2011
Accepted: 28 July 2011
Published online: 25 August 2011

Abstract

The beta decay of ¹¹⁵Ru has been studied by means of Penning-trap-assisted beta and gamma spectroscopy at the IGISOL facility. The level scheme of ¹¹⁵Rh has been substantially extended and compared with the level systematics of lighter rhodium isotopes. Tentative candidates for three states of the deformed K = 1/2 band have been suggested. The beta-strength distribution of the beta decay of ¹¹⁵Ru differs from the beta decays of ^{111, 113, 113m}Ru isotopes due to non-observation of the 3-quasiparticle states in ¹¹⁵Rh. The decay properties of ¹¹⁵Ru indicate a spin-parity of (3/2⁺ for its beta-decaying ground state. In addition, possible Nilsson states as well as the shape and spin transitions in odd neutron-rich ruthenium isotopes are discussed.