Eur. Phys. J. A (2004) 19: 307-317
https://doi.org/10.1140/epja/i2003-10126-y

Spectroscopy of ⁴⁰Ca and negative-parity bands

¹ Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195, Berlin, Germany
² Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, D-14109, Berlin, Germany
³ INFN-Laboratori Nazionali del Sud and Universitá di Catania, Via S. Sofia 44, I-95123, Catania, Italy
⁴ INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy
⁵ Dipartimento di Fisica and INFN, Padova, Italy
⁶ Institut de Recherches Subatomiques, IReS, Strasbourg, France

^* e-mail: oertzen@hmi.de

Abstract

We have studied the reactions as well as the binary channel , in order to search for deformed states, which form rotational bands in ⁴⁰Ca. We observe positive- and negative-parity bands. The negative-parity band is proposed to be a partner of an inversion doublet with the positive-parity states being based on 4p-4h configurations. The properties of the positive-parity states are discussed on the basis of the shell model and the parity doublet on the basis of a cluster model with intrinsic reflection asymmetric shapes.