The breaking of isospin symmetry caused by the Coulomb interaction can be measured by the study of E1 gamma decay. The Isovector Giant Dipole Resonance (IVGDR) was measured in Zn-60 and Zn-62 at two different excitation energies E* = 47 MeV and E* = 58 MeV with the goal of deducing the isospin mixing term. A fusion-evaporation reaction, with a beam of S-32 and a target of Si-28, was used to produce Zn-60. We also produced the compound nucleus Zn-62 using the reaction S-32 + Si-30. This last reaction is required because, for the produced nucleus, the statistical model analysis is much less sensitive to the isospin mixing, and this allows to extract the GDR parameters and use them for isospin mixing sensitive reaction populating neighboring nucleus with N = Z. The experimental setup was composed of GALILEO array (germanium detectors) coupled to the large-volume LaBr3:Ce detectors for the gamma-rays measuring and by two ancillary arrays, EUCLIDES and the Neutron Wall for the detection of particles and neutrons, respectively. An overview on the ongoing analysis and on preliminary results is presented.
Study of the isospin symmetry in 60 Zn
Gosta G.;
2019-01-01
Abstract
The breaking of isospin symmetry caused by the Coulomb interaction can be measured by the study of E1 gamma decay. The Isovector Giant Dipole Resonance (IVGDR) was measured in Zn-60 and Zn-62 at two different excitation energies E* = 47 MeV and E* = 58 MeV with the goal of deducing the isospin mixing term. A fusion-evaporation reaction, with a beam of S-32 and a target of Si-28, was used to produce Zn-60. We also produced the compound nucleus Zn-62 using the reaction S-32 + Si-30. This last reaction is required because, for the produced nucleus, the statistical model analysis is much less sensitive to the isospin mixing, and this allows to extract the GDR parameters and use them for isospin mixing sensitive reaction populating neighboring nucleus with N = Z. The experimental setup was composed of GALILEO array (germanium detectors) coupled to the large-volume LaBr3:Ce detectors for the gamma-rays measuring and by two ancillary arrays, EUCLIDES and the Neutron Wall for the detection of particles and neutrons, respectively. An overview on the ongoing analysis and on preliminary results is presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
