Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Kernphysik / Spektroskopie

HK 8.1: Talk

Monday, March 10, 2008, 14:00–14:15, 2G

Experimental spin distribution in nuclear level schemes from F to Cm. — •Till von Egidy¹ and Dorel Bucurescu² — ¹Physik-Department, Technische Universität München — ²National Institute of Physics and Nuclear Engineering, Bucharest, Romania

The spin distribution of nuclear levels is an essential ingredient of formulas for nuclear level densities. However, experimental information is rather scarce. The distribution is usually assumed to follow the formula f(J) = exp(-J²/2σ²) - exp(-(J+1)²/2σ²) with the spin cut-off parameter σ which corresponds roughly to the maximum of the spin distribution. The theory predicts that σ increases with the moment of inertia, with the nuclear mass and with the nuclear temperature. But the various parameters for these dependencies are not well known. We investigated the experimental spin distribution of 310 nuclei between F and Cm below about 2 MeV in order to test various formulas for σ and to determine the corresponding parameters with least squares fits. The best results will be presented and discussed.