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HK: Fachverband Hadronen und Kerne

HK 19: Accelerators and Instrumentation II

HK 19.2: Gruppenbericht

Montag, 16. März 2009, 17:00–17:30, H-ZO 90

Developments of dedicated plunger devices for lifetime measurements of excited states in exotic nuclei — •A. Dewald¹, Th. Pissulla¹, M. Hackstein¹, C. Fransen¹, W. Rother¹, H. Iwasaki¹, J. Jolie¹, K.-O. Zell¹, A. Gadea², J. J. Valiente Dobón², K. Starosta⁴, W. Korten⁵, A. Görgen⁵, C. A. Ur³, and P. Petkov⁶ — ¹IKP Köln, Germany — ²INFN-LNL Legnaro, Italy — ³University of Padova, Padova, Italy — ⁴NSCL, MSU, US — ⁵SPhN, CEA Saclay, France — ⁶INRNE, Sofia, Bulgaria

The recoil distance Doppler-shift (RDDS) method is an important technique for the measurement of lifetimes of excited nuclear states from which absolute transition strengths can be derived. In order to use this technique for nuclei far from stability it has to be adapted to the special requirements imposed by the specific nuclear reactions in which these exotic nuclei can be produced and excited. E.g., reactions with radioactive beams or deep inelastic reactions have been successfully applied for this purpose in the past. In this presentation we want to give an overview over recent developments of plunger experiments with radioactive beams at intermediate energies (≈100 MeV/u). In addition we will report on recent developments made for measurements at PRISMA-CLARA (LNL, Legnaro, Italy) and EXOGAM-VAMOS (GANIL, Caen, France) where deep inelastic reactions have been used. Future plans for plunger experiments at PRESPEC and HISPEC (GSI) will be discussed. Supported partly by: DFG, contr.n. DE1516/1; GSI,Fu.E, OK/JOL; EC, I3-EURONS contr.n.RII3-CT-2004-506065