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HK: Physik der Hadronen und Kerne

HK 24: Kernphysik/Spektroskopie

HK 24.4: Vortrag

Dienstag, 21. März 2006, 18:00–18:15, C

Test of Pseudospin Symmetry through l-Forbidden Gamow-Teller Transitions.* — •B. Özel¹, A. Byelikov¹, P. von Neumann-Cosel¹, and J. N. Ginocchio² — ¹Institut für Kernphysik, Technische Universität Darmstadt — ²Therotical Division, Los Alamos National Laboratory

The idea of pseudospin was introduced to explain the quasidegeneracy in spherical nuclei between single-nucleon states with quantum numbers (n,l,j=l+1/2) and (n−1,l+2,j=l+3/2). Transitions between pseudospin partners are of so-called l-forbidden GT or M1 type. Pseudospin symmetry has been shown to be a relativistic SU(2) symmetry of the Dirac Hamiltonian [1]. Application of relativistic SU(2) symmetry leads to specific predictions for the strengths of M1 and GT transitions between them depending only on the magnetic moments. It has been tested for M1 transitions against experimental data with overall good agreement [2]. This motivates an analogous test for GT transitions, pursued in this work.

[1] J. N. Ginocchio, Phys. Rev. Lett. 78, 436 (1997)

[2] P. von Neumann-Cosel and J.N. Ginocchio, Phys. Rev. C62 (2000)*Supported by the DFG under SFB 634.