Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Poster
HK 48.33: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Measurement of picosecond lifetimes in odd neutron-rich Xe isotopes — Michael Habib, •Stoyanka Ilieva, and Thorsten Kröll for the EXILL-FATIMA collaboration — Institut für Kernphysik, TU Darmstadt
The nuclear properties in the region around the doubly magic nucleus 132Sn are of special interest. Theory relies on nuclei near closed shells for predicting other, more complex systems. Our interest lies in particular on the neutron-rich Xe isotopes (138−144Xe), as they exhibit both quadrupole and octupole collective properties. The lifetime of an excited state is a direct measure for the strength of the transition and thus allows us to study both phenomena.
Within the EXILL&FATIMA campaign at the experimental nuclear reactor at ILL, Grenoble, the lifetimes of the excited states, populated in the neutron-induced fission of 235U and 241Pu targets, were measured. Using the generalized centroid difference method to analyse the data from the fast timing array (FATIMA) allows us to determine lifetimes down to ≈ 10 ps [1]. The high-resolution EXILL (EXOGAM@ILL) detector gives us the possibility to identify the nuclides of interest among the big amout of produced fission fragments. In this contribution we present the first measurement of lifetimes of low-lying excited states in the odd isotopes 139Xe and 141Xe.
[1] J.-M. Régis et al., Nucl. Instr. Meth. Phys. Res. A 763 (2014) 210
Supported by BMBF under contracts 05P12RDCIA and 05P12RDNUP, by ILL and by HIC for FAIR.