Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 37: Kernphysik/Spektroskopie V

HK 37.1: Gruppenbericht

Donnerstag, 20. März 2003, 13:30–14:00, A

Spectroscopy of heavy odd and odd-odd nuclei — •Ralf Hertenberger¹, Yvonne Eisermann¹, Hans-Friedrich Wirth¹, Gerhard Graw¹, Sandra Christen², Oliver Möller², Dimitar Tonev², Petar Pejovic², Jan Jolie², Jose Barea³, Clara E. Alonso³, Pepe Arias³, and Alejandro Frank⁴ — ¹Sektion Physik, LMU München — ²IKP, Universität zu Köln — ³FAMN, Universidad de Sevilla — ⁴Universidad Nacional Autonoma de Mexico

One of the challenges of the spectroscopy of heavy nuclei is to resolve the low lying part of the dense spectra and to study whether the nuclear structure is related to symmetries resulting from a restricted number of degrees of freedom. Particularly interesting are nuclei with a specific bosonic and fermionic structure where dynamical symmetries may relate and predict the spectra of even-even, even-odd, odd-even and odd-odd nuclei. In this way supersymmetry successfully describes a relevant part of the spectra in the quartet of nuclei ¹⁹⁴Pt, ¹⁹⁵Au, ¹⁹⁵Pt and ¹⁹⁶Au.
Presently we extend our studies to the neighbouring region: We measured with polarized beam at the Munich Q3D spectrograph angular distributions of the transfer reactions (d^→,p) to ¹⁹³Os, ¹⁹⁴Ir and ¹⁹⁷Pt and (d^→,α) to ¹⁹⁴Ir, ¹⁹⁶Au, ²⁰⁰Au and ²⁰²Au. Excellent spectra with high counting statistics were obtained with a new detector system and with beam currents of up to 3 µA on target from the Stern-Gerlach polarized ion source.
The determination of excitation energies, spins and parity is discussed, the results are compared with model expectations.
Work supported by the DFG under C4-Gr894/2-3 and by MLL.