The Electric Dipole Response of 132Sn by Dr. Philip Schrock (CNS, The Univiersity of Tokyo)
=Time and Place=
Dec. 17th 2015, 16:30- at Nishina Hall
Dr. Philipp Schrock
(CNS, The Univiersity of Tokyo)
The Electric Dipole Response of 132Sn
The Isovector Giant Dipole Resonance (IVGDR) is a well-known collective excitation in which all protons oscillate against all neutrons of a nucleus. In neutron-rich nuclei an additional low-lying dipole excitation occurs, often denoted as Pygmy Dipole Resonance (PDR). The strength function of the PDR is related to the thickness of the neutron skin. Experimental information provide important constraints on the theoretical description of nuclear matter, especially pure neutron matter. However, experimental data for exotic neutron-rich nuclei are scarce.
To study the electric dipole response of neutron-rich tin isotopes an experiment was successfully performed with the R3B-LAND setup at GSI Helmholtzzentrum für Schwerionenforschung GmbH (Darmstadt, Germany). Relativistic Coulomb excitation in inverse kinematics was utilized for these studies. The experimental setup is designed to perform kinematically complete measurements of the projectiles and their decay products which allows an event-by-event reconstruction of the excitation energy.
The experimental setup and the analysis method will be described and first results for the dipole response of 132Sn will be discussed.