Level structure of 80Rb studied with the 79Br(α, 3n) reaction

Abstract

States of 80Rb were excited through the 79Br(α, 3n) reaction at bombarding energies between 30 and 55 MeV. Excitation functions, γ-ray angular distributions, γ-γ coincidences and γ-time distributions with respect to the beam bursts were determined. Levels with the following excitation energies (in keV) and spin-parity values are proposed: 175.6 2, 334.9 3(−), 375.9 3+, 418.6 (4), 423.1 (4), 470.5, 472.5 4, 486.1 (5) and 496.4 (5). The 175.6, 375.9 and 472.5 keV levels together with the ground state exhibit a Kπ = 1+ quasi-rotational structure, regarding the energy spacings and the mixing ratios of the γ-rays. It is shown that this structure is quite similar to bands known in 68Ga and 64Cu. A description of these bands in terms of the Nilsson model gives satisfactory results.