Level structure ofZr83

Rotational and single-particle structures in83Zr

“…Data on lifetimes and E2/M1 mixing ratios [7,14], if interpreted with a simple axially symmetric rotor-plus-particle model, ~ive an oblate deformation offl2 = -0.28 for the [422]5/2 yrast band and a protate deformation of B2 = +0.33 for the negative parity yrast band which, however, is more consistent with a [30113/2 Nilsson assignment. The [30111/2-band was found to have a deformation of ]flail =0.26, but no sign of/72 could be established [7].…”

“…3. Here, the DCO ratios of transitions with known multipolarities in 83y, 83Zr ' 84Zr and S~ [5,14,15] populated in this work are plotted versus the respective initial spin. It is found that by gating on a known coincident stretched E2 transition, a quadrupole transition would produce Roco = 1.1, while a stretched 5oo0-GATE:I)0keV N3 ~., …”

“…a agrees with [14] b agrees with [15] c weak intensity in the DCO-matrix d no reference for this DCO-ratio multipolarity assignment because of already known I7 and/7 r based on collectivity arguments g intensity from [14] h attenuated by long lifetimes k assignment based on N=43 systematics, [16][17] no known multipolarities on which to gate Table 1 were subject to the following assumptions and criteria:…”

“…1. The curves show the mass gated distribution of ),-ray yields for known transitions, in 83y, 83Zr and 83Nb [5,14,15,23] as a function of energy loss, AE. By setting gates in the mass gated AE spectrum and carefully subtracting 83y and a3Nb, a spectrum of 83Zr with many new transitions is obtained, shown in the middle portion of Fig.…”

“…Recent in-beam experiments [14,15] [14] indicate that the negative parity wave functions contain several fp-shell admixtures; the [303] 5/2 band shows a relatively strong signature splitting implying some mixing with K= 3/2 and K= 1/2 wavefunctions. These calculations also indicate that the [422] 5/ 2 + band is built on a y-soft deformation evolving into a well defined triaxial shape above the first band crossing.…”