Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Structure and Dynamics of Nuclei IV

HK 13.6: Talk

Monday, March 14, 2016, 18:00–18:15, S1/01 A04

Exited-state lifetimes in neutron-rich Ce isotopes from EXILL&FATIMA — •P. Koseoglou¹, V. Werner^1,2, N. Pietralla¹, I. Stoyanka¹, C. Bernards², A. Blanc³, A.M. Bruce⁴, R.B. Cakirli⁵, N. Cooper², G. de France⁶, P. Humby⁷, M. Jentschel³, J. Jolie⁸, U. Koester³, T. Kröll¹, P. Mutti³, Z. Patel⁷, V. Paziy⁹, Zs. Podolyak⁷, P.H. Regan⁷, J.-M. Régis⁸, O.J. Roberts⁴, N. Saed-Samii⁸, G.S. Simpson¹⁰, T. Soldner³, C.A. Ur¹¹, W Urban³, D. Wilmsen⁸, and E. Wilson⁷ — ¹IKP TU-Darmstadt, Darmstadt, Germany — ²Yale University, USA — ³ILL Grenoble, France — ⁴University of Brighton, England — ⁵MPIK Heidelberg, Germany — ⁶GANIL Caen, France — ⁷University of Surrey, England — ⁸KP University of Cologne, Germany — ⁹Universidad Complutense, Spain — ¹⁰PSC Grenoble, France — ¹¹INFN Legnaro, Italy

235U and 241Pu fission fragments were measured by a mixed spectrometer consisting of high-resolution Ge and fast LaBr3(Ce)-scintillator detectors at the high-flux reactor of the ILL. Prompt γ-ray cascades from the nuclei of interest are selected via Ge-Ge-LaBr3-LaBr3 coincidences. The good energy resolution of the Ge allow precise gates to be set, selecting the cascade, hence, the nucleus of interest. The excellent timing performance of the LaBr3 detectors in combination with the General Centroid Difference method allows the measurement of lifetimes in the ps range in preparation for the FATIMA experiment at FAIR. The first results on neutron-rich Ce isotopes are presented. Supported by HGS-HIRe