Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.2: Talk
Thursday, March 15, 2007, 11:30–11:45, B
Test of the critical point symmetry X(5) in the mass region A=180 — •barbara melon1, alfred dewald1, oliver moeller1, thomas pissulla1, christoph fransen1, jan jolie1, andreas linnemann1, pavel petkov2, dimitar tonev3, giacomo de angelis3, dino bazzacco3, calin ur4, roberto menegazzo4, enrico farnea4, and karl oscar zell1 — 1IKP, Universität zu Köln, Köln, Germany — 2Bulg. Acad. of Sciences, Inst. for Nucl. Res. and Nucl. Ener., Sofia, Bulgaria — 3INFN, LN di Legnaro, Italy — 4Dip. di Fisica, Universita’ and INFN Sez. Padova, Italy
Recently, the first examples of X(5) like nuclei in the mass region A=180 have been identified, 176,178Os. We report on further results of a lifetime measurement performed at the LN Legnaro using the Köln coincidence plunger device and the GASP spectrometer. Excited states were populated via the reaction 152Sm(29Si,5n)176Os at E(29Si) = 145 MeV. Special effort has been made to reduce the experimental uncertainty of the B(E2, 21+→01+) value in 178Os, used for transition strength normalizations in 178Os necessary for the comparison with theoretical models. A second experiment was performed to measure the lifetime of the first excited 2+ state in 178Os with the Köln coincidence plunger device at the FN Tandem accelerator of the University of Cologne using THE 166Er(16O,4n)178Os reaction at E(16O) = 80 MeV. The resulting lifetime has been compared to the value obtained using the delayed coincidence method.
Supported partly by the European Union TMR Program, contract HPRI-CT-1999-00083