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HK: Physik der Hadronen und Kerne

HK 35: Theorie VI

HK 35.1: Group Report

Wednesday, March 21, 2001, 16:30–17:00, B

The world of Vampires and Monsters — •Tuomas Hjelt, Karl Wilhelm Schmid, Jang Ming Zhu, and Amand Faessler — Institut für Theoretische Physik der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

The generic symmetry-projected mean-field based family of methods for solving quantum mechanical many-body problems has been put in use by active applications to a variety of realistic nuclear structure problems. The calculations have been performed using state of art techniques and computing facilities.

The VAMPIR method provides a single fully symmetry-projected general HFB-type Slater determinant description of a chosen yrast state. For the pf-shell nuclei in 0 ℏ ω model space this variational approach has proven to be a remarkable truncation scheme for the exact shell model diagonalization [1], challenging the quantum Monte-Carlo diagonalization method in the middle of the pf-shell. Even more binding energy is obtained for ⁵⁶Ni with the 3-determinant description [2].

Recently, the MONSTER multi-configuration mixing method was generalized to take into account all fully symmetry projected 2-quasiparticle excitations on top of a chosen yrast vacuum determinant [3].

[1] T. Hjelt, K.W. Schmid, E. Hammarèn and A. Faessler, Eur.Phys.J.A7 (2000)

[2] T. Hjelt, K.W. Schmid and A. Faessler, in preparation

[3] T. Hjelt, Ph.D. Thesis, University of Jyväskylä, Department of Physics, Research Report 3/2000