Isospin Symmetry Breaking in Mirror Nuclei 23^23Mg--23^23Na

Zakopane Conference on Nuclear Physics - Extremes of the Nuclear Landscape -- AUG 28-SEP 04, 2016 -- Zakopane, POLANDWOS: 000398717500011Mirror energy differences (MED) are a direct consequence of isospin symmetry breaking. Moreover, the study of MED has proved to give valuable information of several nuclear structure properties. We present the results of an experiment performed in GANIL to study the MED in mirror nuclei Mg-23-Na-23 up to high spin. The experimental values are compared with state-of-the-art shell model calculations. This permits to enlighten several nuclear structure properties, such as the way in which the nucleons alignment proceeds, the radius variation with J, the role of the spin-orbit interaction and the importance of isospin symmetry breaking terms of nuclear origin

Two-Particle Separation Energies in the Superdeformed Well

The location of nuclear closed shells, as evidenced through discontinuities in binding energy and one-and two-particle separation energy systematics, remains one of the simplest tests of global nuclear models. How shell gaps evolve, whether with increasing mass, increasing neutron: proton ratio or increasing deformation, is still uncertain, and it has recently been suggested that one must go beyond a static meanfield picture to include the effects of dynamic fluctuations in the nuclear shape even in the ground state. The identification of key properties which may distinguish between competing approaches is thus vital. Comparison of the binding energies of superdeformed nuclei in the A approximate to 190 region shows that two-proton separation energies are higher in the superdeformed state than in the normal state, despite the probably lower Coulomb barrier and lower total binding energy. Possible reasons for this difference are discussed. This somewhat counterintuitive result provides a critical test for global nuclear models

Medium- and high-spin band structure of the chiral candidate 132La

Medium- and high-spin states of La-132 have been studied based on the data obtained from Mo-100(S-36, p3n) and Cd-116(Na-23, alpha 3n) fusion-evaporation reactions using the EUROBALL and Gammasphere detector arrays, respectively. Triple-gamma coincidence relations, angular correlations, and linear polarizations of the observed gamma transitions have been deduced. The level scheme of La-132 has been considerably extended, and unambiguous spin and parity values have been assigned to most of the excited states. The configuration of one of the bands is pi g(7/2)(h(11/2))(2)nu h(11/2) instead of the previously thought pi h(11/2)nu h(11/2); thus its previously suggested magnetic rotational character cannot be upheld. The observed similarities between the level structures of La-132 and Pr-134 suggest the possible existence of a third pi h(11/2)nu h(11/2) band in La-132 that may show chiral features