Abstract
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus ^{95}mathrm {Rh}. The fusion-evaporation reaction ^{58}Ni(^{40}Ca, 3p) was used to populate high-spin states in ^{95}mathrm {Rh} at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6;mathrm {mg/cm}^2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.
Highlights
Experimental set-upThe experiment was performed at the Grand Accélérateur National d’Ions Lourds (GANIL), Caen, France
Attenuation Method (DSAM) based on the Doppler broad- is expected to appear in the heaviest N=Z nuclei [1,2] and ened line shapes produced during the slowing down process the seniority structure of the N = 50 isotones [3,4,5,6,7]
The lifetime result that we reported for the 18+ state in the 94Ru nucleus [11] is in agreement with the previous measurement [29] using a different (RDDS) technique providing confidence in the validity of the special use of the Doppler Shift Attenuation Method (DSAM)
Summary
The experiment was performed at the Grand Accélérateur National d’Ions Lourds (GANIL), Caen, France. The beam of 40Ca ions was accelerated by the CSS1 cyclotron of GANIL to a kinetic energy of 150 MeV and subsequently degraded to 128 MeV in a thin Ta foil in front of the production target. The experimental set-up consisted of the EXOGAM germanium detector array [13], the DIAMANT charged particle detector system [14,15] and the Neutron Wall liquid scintillator array [16]. The condition for the neutron-like events was determined by the pulse shape of the organic liquid scintillator detector signals This hardware threshold was sufficiently relaxed to allow a substantial fraction of neutron-less events, in particular corresponding to the 95Rh, to be collected. The energy and efficiency calibrations were carried out with standard radioactive sources (60Co and 152Eu)
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