High-angular-momentum structures inZn64

Abstract

High-angular-momentum states in 64 Zn were populated in the 40 Ca͑ 28 Si, 4p͒ reaction at a beam energy of 122 MeV. Evaporated, light, charged particles were identified by the Microball, while ␥ rays were detected using the Gammasphere array. The main focus of this paper is on two strongly coupled, collective bands. The yrast band, which was previously known, has been linked to lower-lying states establishing the excitation energies and angular momenta of in-band states for the first time. The newly identified excited band decays to the yrast band but firm angular-momentum assignments could not be made. In order to interpret these structures cranked-Nilsson-Strutinsky calculations have been performed. The calculations have been extended to account for the distribution of nucleons within a configuration. The yrast collective band is interpreted as based on the ͑f 7/2 ͒ −1 ͑p 3/2 f 5/2 ͒ 2 ͑g 9/2 ͒ 1 ͑p 3/2 f 5/2 ͒ 4 ͑g 9/2 ͒ 2 configuration. There are several possible interpretations of the second band but it is difficult to distinguish between the different possibilities. A. AnalysisHigh-angular-momentum states were populated in the 40 Ca͑ 28 Si, 4p͒ reaction at a beam energy of 122 MeV. The beam, accelerated by the ATLAS accelerator at the Argonne National Laboratory, was incident on a Ӎ400 g/cm 2 40 Ca foil with a flash of Ӎ100 g/cm 2 Au on both sides to prevent oxidation. ␥ rays were detected with the Gammasphere array [15] which, for this experiment, comprised 101 HPGe detectors. Light charged particles were detected with the Mi-*Present address:

Comparative study of rotational bands in theA≈60mass region: Modification of Nilsson parameters

“…Subsequently, the band was linked and observed to termination at I = 26 in Ref. [32]. A small discontinuity in the band could be reproduced as a crossing between two fp neutron orbitals by lowering the 1f 5/2 subshell by approximately 300 keV relative to the 2p 3/2 subshell.…”

“…In addition to TB1, another collective band has been observed in the I ∼ 15-23 spin range, but it is not firmly linked and has no obvious interpretation; see Ref. [32].…”

“…Therefore, in the case with one hole in these orbitals, the lowest and next-lowest band is searched [32]. The interaction between these two bands is then "removed," resulting in two noninteracting bands of the character (1f 7/2 ) −2 (fp) 1 and (1f 7/2 ) −3 (fp) 2 , respectively, for the N = 3 occupancy.…”

Deformed shell model results for neutrinoless positron double beta decay of nuclei in theA= 60–90 region

“…The calculated levels and bands for 64 Zn and 64 Ni are compared with experiment in figures 3 and 4. The experimental data for the two nuclei are taken from [50,51] and [52]. The agreement is quite satisfactory.…”

High-spin spectroscopy of140Nd

“…14 and 15, it is then straightforward to see which orbitals are occupied in a specific configuration. Because these labels are defined at a fixed deformation, it becomes possible to specify exactly which orbitals are occupied, contrary to the CNS labels where it is assumed that the lowest orbitals within a specific group are occupied (however, in specific cases, excitations within CNS configurations have been considered; see, e.g., [35,36]).…”