S. Courtin

Deformation of the N=Z nucleus Sr-76 using beta decay studies

A novel method of deducing the deformation of the N=Z nucleus 76Sr is presented. It is based on the comparison of the experimental Gamow-Teller strength distribution B(GT) from its beta decay with the results of quasi-random-phase approximation calculations. This method confirms previous indications of the strong prolate deformation of this nucleus in a totally independent way. The measurement has been carried out with a large total absorption gamma spectrometer, Lucrecia, newly installed at CERN-ISOLDE.

High-spin structures of the odd-A4397−105Tc isotopes

The 99−105Tc isotopes have been produced at high spin as fission fragments following the fusion reaction 37Cl(170 MeV) + 176Yb and studied with the Euroball3 array. The high-spin structures of 103Tc have been identified for the first time. From the systematics of the yrast states of 97−105Tc, the location of individual proton states can be analyzed as a function of the neutron number.

First evidence for linking transitions between the superdeformed yrast band and the normal deformed states in Gd-149

Double step resolved gamma-ray transitions linking the yrast superdeformed (SD) band of Gd-149 to the normal deformed (ND) level scheme have been observed using the EUROGAM phase II spectrometer. The excitation energy of the 47/2(-) SD state above the 7/2(-) ground state has thus been determined to be 10.625 MeV. The most likely multipolarity of the Linking transitions is deduced, which permits the assignment of the most probable spins for this SD band. This measurement represents the first observation of discrete gamma-ray transitions linking SD and ND states in the A similar to 150 mass region of the nuclear chart

Fusion of the positive Q‐value system 36S+48Ca

The fusion excitation function for 36S+48Ca with positive Q‐value for the compound nucleus formation, has been measured from near the barrier down to very low energies, where “fusion hindrance” may be expected. No evidence of hindrance shows up in the measured energy range. Coupled‐channels calculations have been performed with a large diffuseness parameter of the Wood‐Saxon potential, reproducing the data above and below the barrier.

The low-spin structure of 115Xe

Abstract: The low-spin band structure of neutron-deficient 11554Xe has been studied following a low-energy (212.3 MeV) 60Ni(58Ni,2pnγ) reaction performed at IReS, Strasbourg, with the Garel+ spectrometer. The relative excitation energies of νh11/2 (isomeric), νg7/2, and νd5/2 bandheads have been established.