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Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Postersitzung: Kernphysik/Spektroskopie

HK 12.7: Poster

Dienstag, 20. März 2001, 10:30–12:45, R

Cluster interpretation of octupole deformation in the actinide region. — •T.M. Shneidman1,2, G.G. Adamian2, N.V. Antonenko2, R.V. Jolos2, and W. Scheid11Institute f ür Theoretische Physik der Justus-Liebig-Universit ät, 35392 Giessen — 2Joint institute for Nuclear Research, 141980, Dubna, Russia

If a nucleus is soft with respect to octupole vibrations or has an intrinsic octupole deformation, low-lying negative parity states appear in the ground state band of the nucleus. The positive and negative parity states form a disturbed rotational band. The states with negative parity are shifted up with respect to the unperturbed position.

We explain the parity splitting by a cluster interpretation of the octupole deformation of the nuclei. Cluster configurations AZA−4(Z−2)+4He have an energy which is close or even lower than the energy of the compound nucleus [1]. We consider oscillations in mass asymmetry η=(A1A2)/(A1+A2) near |η|=1. The parity splitting appears then due to the tunneling between the octupole deformed shape and its mirror image. We calculate the spin dependence of the parity splitting, moments of inertia, strengths of E1 and E2 transitions and multipole moments of octupole deformed nuclei in the actinide region and compare them with experimental data.
[1]. T.M.Shneidman, G.G.Adamian, N.V.Antonenko, S.P.Ivanova, W.Scheid, Nucl.Phys, A671 (2000)119-135

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