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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.48: Poster

Thursday, March 19, 2009, 14:00–16:00, Audi-Max

Two-phonon γ-vibrational states in ¹⁷⁰Er — •Douglas DiJulio, Joakim Cederkall, Claes Fahlander, Pavel Golubev, Dirk Rudolph, Andreas Ekström, Emma Johansson, and Edana Merchan — Physics Department, Lund University, Sweden

Two phonon γ-vibrational states in the nucleus ¹⁷⁰Er have been investigated by Coulomb excitation. The experiments were carried out at the Laboratori Nazionali di Legnaro (LNL) using the GASP array coupled to the new Lund Silicon Array (LuSiA) detector system for charged particle detection. LuSiA consists of four square double-sided silicon-strip detectors mounted in a box surrounding the target position. The two-phonon γ-vibrational states were populated using the ³²S +¹⁷⁰Er reaction at a "safe" beam energy of 117 MeV. Along with the excitation energies of the states, of particular interest is the B(E2) ratio between the transitions from the two-phonon and one-phonon states which is predicted to have a specific value at the critical point Y(5). Preliminary results from the experiment will be presented.