Eur. Phys. J. A 13, 339-347 (2002)

Symmetry character of collective states in populated in the decay of

A. Giannatiempo^{1, 2}, A. Nannini², A. Perego^{1, 2} and P. Sona<sup>1, 2

1</sup>  Dipartimento di Fisica, Università di Firenze, 50125, Florence, Italy
²  Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, 50125, Florence, Italy

giannatiempo@fi.infn.it

(Received: 26 September 2001 Communicated by R.A. Ricci)

Abstract
The states of ¹⁰⁴Pd, populated in the EC- decay of the ground ( ) and metastable ( ) states of ¹⁰⁴Ag, have been investigated in the framework of the proton-neutron interacting boson model, extending a previous analysis to take into account the newly appeared experimental data. All positive-parity states up to an excitation energy of 3 MeV and spin in the range , fed by more than 0.3% in the decay of the parent nucleus, have been considered. As a result, strong evidence has been found for interpreting most of these states as states of collective nature having a quite pure full- or mixed-symmetry character and, in particular, for identifying the 1 ⁺ level at 2276 keV as the lowest 1 ⁺ mixed-symmetry state.

PACS
21.60.Fw - Collective models.
21.10.Re - Collective levels.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2002