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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.19: Poster

Monday, March 7, 2005, 16:30–18:00, TU MA141

Search for Short-Lived Fission Isomers in light Actinides* — •P.G. Thirolf, D. Habs, R. Hertenberger, H.J. Maier, T. Morgan, O. Schaile, W. Schwerdtfeger, and J. Szerypo — Ludwig-Maximilians-Universität München

Spectroscopic studies of super- and hyperdeformed actinide nuclei offer the possibility to gain insight into the multiple-humped fission barrier landscape of these heavy nuclei. With the identification of deep third minima in 234,236U the systematics of fission isomers in light actinides was revisited, especially searching for short-lived isomers in light uranium isotopes. Using a geometrical projection method and solid state nuclear track detectors, we started an experimental search for their observation. This rather old detection technique [1] nowadays benefits from an efficient analysis technology based on a PC-controlled auto-focus microscope and a CCD camera together with pattern recognition software. Using the 232Th(α,2n) reaction, evidence was found for a new fission isomer in 234U with a halflife of 110±10 ps. The reaction 238U(α,2n) was used for calibration and normalization. Excitation functions and absolute prompt and isomeric fission cross sections were measured. Also the (3He,3n) reactions on 232Th and 235U target were studied in a similar way, searching for an isomer in 232U and measuring the known isomer in 238Pu for calibration purposes, respectively. First results will be presented. [1] V. Metag et al., Nucl. Instr. Meth 114 (1974) 445.
* Supported by the DFG under contract HA 1101/12-1

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