Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Struktur und Dynamik von Kernen X

HK 63.4: Talk

Friday, March 19, 2010, 15:15–15:30, HG II

Experimental energy-dependent nuclear spin distributions — •Till von Egidy¹ and Dorel Bucurescu² — ¹Physik-Department, T.U. Muenchen — ²National Inst. Phys. and Nucl. Eng., Bucharest

A new method is proposed to determine the energy dependent spin distribution in experimental nuclear level schemes. This method compares various experimental and calculated moments in the energy-spin plane in order to obtain the spin-cutoff parameter σ as a function of mass A and excitation energy using a total of 7202 levels with spin assignment in 227 nuclei between F and Cf. A simple formula, σ² = 0.391 · A^0.675(E−0.5 · Pa′)^0.312, is proposed up to about 10 MeV which is in very good agreement with experimental σ values and is applied to improve the systematics of level density parameters.