Pygmy and Giant Dipole Resonance (PDR and GDR) in Ni isotopes have been investigated by Coulomb excitation in the framework of the Isospin-dependent Quantum Molecular Dynamics model (IQMD). The spectra of γ rays are calculated and the peak energy, the strength and Full Width at Half Maximum (FWHM) of GDR and PDR have been extracted. Their sensitivities to nuclear equation of state, especially to its symmetry energy term are also explored. By a comparison with the other mean-field calculations, we obtain the reasonable values for symmetry energy and its slope parameter at saturation, which gives an important constrain for IQMD model. In addition, we also studied the neutron excess dependence of GDR and PDR parameters for Ni isotopes and found that the energy-weighted sum rule (EWSR) P DRm 1 /GDRm 1 % increases linearly with the neutron excess.

Two-proton relative momentum (q pp ) and opening angle (θ pp ) distributions from the three-body decay of two excited proton-rich nuclei, namely 23 Al → p + p + 21 Na and 22 Mg → p + p + 20 Ne, have been measured with the projectile fragment separator (RIPS) at the RIKEN RI Beam Factory. An evident peak at q pp ∼ 20 MeV/c as well as a peak in θ pp around 30 • are seen in the two-proton break-up channel from a highly-excited 22 Mg. In contrast, such peaks are absent for the 23 Al case. It is concluded that the two-proton emission mechanism of excited 22 Mg is quite different from the 23 Al case, with the former having a favorable diproton emission component at a highly excited state and the latter dominated by the sequential decay process.

The production of alpha particle decaying heavy nuclei in reactions of 7.5-6.1 MeV/nucleon 238 U + 232 Th has been explored using an in-beam detection array composed of YAP scintillators and gas ionization chamber-Si telescopes. Comparisons of alpha energies and half-lives for the observed products with those of the previously known isotopes and with theoretically predicted values indicate the observation of a number of previously unreported alpha emitters. Alpha particle decay energies reaching as high as 12 MeV are observed. Many of these are expected to be from decay of previously unseen relatively neutron rich products. While the contributions of isomeric states require further exploration and specific isotope identifications need to be made, the production of heavy isotopes with quite high atomic numbers is suggested by the data.