Quasi-elastic barrier distribution as a tool for investigating unstable nuclei
萩野浩一
東北大・理
日時：2004年05月28日（金） 11:00-
場所：大学院講義室（総合研究棟7階745号室）
Heavy-ion collisions at energies around the Coulomb barrier provide an ideal opportunity to study quantum tunneling phenomena in systems with many degrees of freedom. It is now well known that a barrierdistribution can be extracted experimentally from the fusion excitation function $\sigma_{\rm fus}(E)$. This method has opened up the possibility of using the heavy-ion fusion reaction as a "quantum tunnelingmicroscope" in order to investigate both the static and dynamical properties of atomic nuclei.It has been suggested that the same information as the fusion crosssection may be obtained from the cross section for quasi-elasticscattering (a sum of elastic, inelastic, and transfer cross sections) at large angles. In this talk, we will study in detail the properties of the barrier distribution extracted from large-angle quasi-elastic scattering of heavy ions at energiesnear the Coulomb barrier. We will argue that the quasi-elastic barrier distribution offers an interesting tool for investigating unstable nuclei.We will illustrate this for the $^{32}$Mg + $^{208}$Pb reaction, where the quadrupole collectivity of the neutron-rich $^{32}$Mg remains to be clarified experimentally.
16：00より茶菓を用意いたします。