Eur. Phys. J. A (2005) 25: 509-510
https://doi.org/10.1140/epjad/i2005-06-207-9

ENAM 2004

Shell model analysis of intruder states and high- K isomers in the fp shell

¹ Physics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
² Department of Physics, University of Tennessee, 37996, Knoxville, TN, USA
³ Institute of Theoretical Physics, Warsaw University, ul. Hoża 69, 00-681, Warsaw, Poland

^* e-mail: stoitchevags@ornl.gov

Received: 12 September 2004
Accepted: 18 February 2005
Published online: 15 August 2005

Abstract

We perform a systematic shell-model study of collective intruder structures and fully aligned high-spin states in nuclei from the lower-fp shell in the sdfp configuration space. We analyze the intruder structures associated with the 1p-1h cross-shell excitations from the sd shell that have been observed in several nuclei from this region, including ⁴⁴Ti and ⁴⁴Sc. We compare the shell-model calculations to the recent mean-field work (H. Zduńczuk, W. Satuła, R.A. Wyss, nucl-th/0408018) and experimental data (M. Lach, J. Styczeń, private communication). The high-spin behavior may be understood in terms of the competing cross-shell proton and neutron excitations. The interplay between proton and neutron intruder states is reflected in the angular-momentum dependence of electromagnetic rates.