Bochum 2009 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
HK: Fachverband Hadronen und Kerne
HK 58: Nuclear Structure and Dynamics I
HK 58.5: Talk
Wednesday, March 18, 2009, 17:45–18:00, H-ZO 40
Lifetime Measurements for non-yrast states in 118Te — •C. Mihai1, I. Cata-Danil1, A.A. Pasternak2, A.D. Efimov2, L. Stroe1, D. Filipescu1, M. Ivascu1, T. Glodariu1, D. Bucurescu1, G. Cata-Danil3, N. Marginean1, and N.V. Zamfir1 — 1National Institute for Physics and Nuclear Engineering "Horia Hulubei", Bucharest-Magurele, Romania — 2Cyclotron Laboratory, A.F. Ioffe Physical Technical Institute,194021, St. Peterburg, Russia — 3Physics Department, University "Politehnica", Bucharest, Romania
Lifetimes of excited states in 118Te populated in the 115Sn(α,n)118Te reaction have been measured using the Doppler Shift Attenuation method (DSAM). A 15 pnA, 15 MeV 4He2+ beam delivered by the Bucharest FN-TANDEM impinged on a 3.72 mg/cm2 tin target, 56% enriched in 115Sn. The non-selective character of the reaction allowed us to measure lifetimes of non-yrast states with spin up to 8+, by lineshape analysis of the γ-ray spectra. The γ-rays emitted following the reaction were detected in 7 large volume HPGe detectors, 5 placed in a 37 degrees ring in the backward direction, one at 90 degree and one at various angles in the forward direction. Additionally, a NE213 liquid scintillator detector was used for the detection of neutrons emitted in the reaction in coincidence with γ-rays.
Lifetimes of the yrast states in 118Te were previously measured in heavy ions reactions, both by DSAM and RDM methods. The new results obtained in this work for the non-yrast states together with the existing information on lifetimes in the ground state band of 118Te are discussed in the framework of the Interacting Bosons Model (IBM).