2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 13, 99-103 (2002)

Proton-neutron structure of collective excitations in $\chem{^{94}Mo}$

P. von Brentano1, C. Fransen1, A. Gade1, A. Lisetskiy1 and N. Pietralla1, 2

1  Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
2  A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, USA

(Received: 1 May 2001)

Abstract
Resulting wave functions of low-lying $J^\pi = 2^+$ states from a recent shell model calculation for the near-spherical nucleus 94Mo are analyzed with respect to their collectivity and the proton-neutron degree of freedom. The analysis uses the Q-phonon scheme applied to the shell model and it supports the mixed-symmetry interpretation of the interacting boson model for the multiphonon structure observed recently in 94Mo by means of $\gamma$-ray spectroscopy. Simple operators are obtained which generate major parts of the symmetric- and mixed-symmetry 2+ states in 94Mo when applied to the calculated ground state.

PACS
21.60.Cs - Shell model.
21.10.Re - Collective levels.
23.20.Js - Multipole matrix elements.
27.60.+j - $90 \leq A \leq 149$ .

© Società Italiana di Fisica, Springer-Verlag 2002