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Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Kernphysik / Spektroskopie

HK 46.4: Talk

Thursday, March 15, 2007, 15:00–15:15, B

Search for the shape-isomer in 235U — •Stephan Oberstedt1, Andreas Oberstedt2, and Michael Gawrys31EC-JRC IRMM, B-2440 Geel — 2Dept. of Natural Science, Örebro University, S-70182 Örebro — 3Dept. of Fundam. Physics, Chalmers Uni. of Technology, S-41296 Göteborg

The need to improve the knowledge about the double- or even triple-humped fission barrier initiated a systematic investigation of shape-isomeric decay modes in actinide nuclei. At present, the population and the principle decay mode in odd-A uranium isotopes is of particular interest for improving nuclear reaction models. Neither of both is known today, and different half life systematics give predictions, which range across up to five orders of magnitude.

Recently, the IRMM isomer spectrometer NEPTUNE [1] was used to search for the shape-isomer in 235U using the reaction 234U(n, f) at En = 0.95 and 1.27 MeV. For the first time shape-isomeric fission with a tentative half life T1/2 = (4.5 ± 0.3) ms has been observed

 
S. Oberstedt et al., DPG Spring Meeting, Hadrons and Nuclei, München (2006) HK57.4

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