Evidence for particle-hole excitations in the triaxial strongly-deformed well of ^{163}Tm

Two interacting, strongly-deformed triaxial (TSD) bands have been identified in the Z = 69 nucleus ^{163}Tm. This is the first time that interacting TSD bands have been observed in an element other than the Z = 71 Lu nuclei, where wobbling bands have been previously identified. The observed TSD bands in ^{163}Tm appear to be associated with particle-hole excitations, rather than wobbling. Tilted-Axis Cranking (TAC) calculations reproduce all experimental observables of these bands reasonably well and also provide an explanation for the presence of wobbling bands in the Lu nuclei, and their absence in the Tm isotopes.Comment: 13 pages, 7 figure

Vibrational and rotational sequences in 101 Mo and 103,4 Ru studied via multinucleon transfer reactions

The near yrast states of 101 Mo and 103,104 Ru have been studied following their population via heavy ion multinucleon transfer reactions between a 136 Xe beam and a thin, self supporting 100 Mo target. The ground state sequence in 104 Ru can be understood as demonstrating a simple evolution from a quasi vibrational structure at lower spins to statically deformed, quasi rotational excitation involving the population of a pair of low Omega h11 2 neutron orbitals. The effect of the decoupled h11 2 orbital on this vibration to rotational evolution is demonstrated by an extension of the E GOS prescription to include odd A nuclei. The experimental results are also compared with self consistent Total Routhian Surface calculations which also highlight the polarising role of the highly aligned neutron h11 2 orbital in these nucle

High-spin, multiparticle isomers in Sb121,123

Isomers in near-spherical Z=51, antimony isotopes are reported here for the first time using fusion-fission reactions between Al27 and a pulsed Hf178 beam of energy, 1150 MeV. γ rays were observed from the decay of isomeric states with half-lives, T1/2=200(30) and 52(3)μs, and angular momenta I=(252) and Iπ=232+, in Sb121,123, respectively. These states are proposed to correspond to ν(h112)2 configurations, coupled to an odd d52 or g72 proton. Nanosecond isomers were also identified at Iπ=192- [T1/2=8.5(5) ns] in Sb121 and Iπ=(152-) [T1/2=37(4) ns] in Sb123. Information on spins and parities of states in these nuclei was obtained using a combination of angular correlation and intensity-balance measurements. The configurations of states in these nuclei are discussed using a combination of spin/energy systematics and shell-model calculations for neighboring tin isotones and antimony isotopes

Band structures in 108^{108}In

High spin states in $^{108}$In have been established upto ~ 8 MeV in excitation energy and to a tentative spin of (23$^-$). The data were obtained by in-beam $\gamma$-ray spectroscopy using the reaction at a beam energy of 86 MeV. Four sequences of dipole bands and a normal rotational band of E2 $\gamma$-transitions have been placed in the level scheme

Intruder bands in 113^{113}Sn

The level structure of $^{113}$Sn has been investigated. The data were obtained by in-beam $\gamma$-ray spectroscopy using the reaction at 70 MeV performed at the OSIRIS gamma array in the Institut für Kernphysik FN Tandem accelerator. We report in this short note the observation of two intruder type rotational bands in this nucleus

Five-quasiparticle bands in 127^{127}Ba

High spin states in 127Ba have been investigated with the fusion–evaporation reaction 96Zr(36S,5n)127Ba at a beam energy of 150 MeV with the GASP-spectrometer at INFN in Legnaro, Italy. The level scheme could be extended to high spins resulting in the observation of five-quasiparticle states. Altogether 15 band structures were placed in the level scheme. (Springer

High spin states in 128^{128}Ba

High spin states in 128Ba have been investigated with the fusion–evaporation reaction 96Zr(36S,4n)128Ba at a beam energy of 150 MeV with the GASP-spectrometer at INFN in Legnaro, Italy. The level scheme could be extended to higher spins and six-quasiparticle states have been observed. The deduced alignments are compared to the predictions of previously reported cranked shell model calculations. (Springer

Observation of an isomeric state in 197Au

A medium spin isomer in 197Au is identified with t1 2 150 5 ns following a multinucleon transfer reaction between an 850 MeV 136Xe beam and a 198Pt target. The transitions identified here are considered and possible configurations for the associated levels discussed. In addition, a newly observed out of beam transition in 195Au is briefly reporte