Eur. Phys. J. A (2007) 33: 193-212
https://doi.org/10.1140/epja/i2007-10436-0

Regular Article - Theoretical Physics

Structure of low-spin states in the doubly-odd ¹⁸²Ir nucleus

¹ Institut de Physique Nucléaire, IN2P3-CNRS/Université Paris-Sud, F-91406, Orsay cedex, France
² Departamento de Fısica, Comisión Nacional de Energıa Atómica, Buenos Aires, Argentina
³ CONICET, Buenos Aires, Argentina
⁴ Escuela de Ciencia y Tecnologıa, Universidad de San Martın, Argentina
⁵ Institut de Physique Nucléaire, Université Claude Bernard Lyon-1, F-69622, Villeurbanne cedex, France
⁶ Institute of Experimental Physics, Warsaw University, Hoza 69, PL-00-681, Warsaw, Poland
⁷ Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble cedex, France
⁸ Institut de Recherches Subatomiques, F-67037, Strasbourg, France

^* e-mail: hojman@tandar.cnea.gov.ar

Received: 3 May 2007
Accepted: 10 July 2007
Published online: 7 August 2007

Abstract

Low-spin states of ¹⁸²Ir were populated through the β⁺ /EC decay of ¹⁸²Pt . Two strong E2 transitions were observed for the first time: a 25.7keV transition in ¹⁸²Ir and a 34.0keV transition in Re of probable mass A = 178 . Spin and parity, I ^π = 3⁺ , are firmly assigned to the ¹⁸²Ir ground state (g.s.). For the excited states, the parity is established and the spin determined or restricted. These assignments support most of the interpretations of the level structure previously suggested. The systematics for the known 5⁺ → 3⁺ transitions in π h _9/2 ⊗ ν 1/2^-[521] bands is presented. Using a semi-microscopic two-quasiparticle axial-rotor coupling model, particle configurations have been attributed or suggested for most of the coupled states lying at low energy in ¹⁸²Ir .