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Title: Level Dynamics of non-yrast States

Abstract

We present a systematic study of the dynamics of non-yrast states using a simple but physically relevant hamiltonian. The emphasis is put on the behavior of 0+ states. When the transition takes place between spherical and gamma-soft nuclei level bunching occurs which is related to the conserved seniority. Similar behavior occurs in the regular region which is not directly connected with the known symmetries. In between spherical and prolate nuclei a sharp increase in the level density of 0+ states is found. We report on recent (p,t) transfer reactions related to these topics which were performed at the Q3D spectrometer in Garching with the aim to measure the 0+ states in a complete way up to high energy.

Authors:
;  [1]
  1. Institute of Nuclear Physics, University of Cologne, Zuelpicher Strasse 77, 50937 Cologne (Germany)
Publication Date:
OSTI Identifier:
20798311
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 819; Journal Issue: 1; Conference: 12. international symposium on capture gamma-ray spectroscopy and related topics, Notre Dame, IN (United States), 4-9 Sep 2005; Other Information: DOI: 10.1063/1.2187880; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY-LEVEL DENSITY; ENERGY-LEVEL TRANSITIONS; HAMILTONIANS; PROTON REACTIONS; PROTON-NUCLEON INTERACTIONS; SPHERICAL CONFIGURATION; SYMMETRY; TRANSFER REACTIONS; YRAST STATES

Citation Formats

Jolie, J., and Heinze, S. Level Dynamics of non-yrast States. United States: N. p., 2006. Web. doi:10.1063/1.2187880.
Jolie, J., & Heinze, S. Level Dynamics of non-yrast States. United States. doi:10.1063/1.2187880.
Jolie, J., and Heinze, S. Mon . "Level Dynamics of non-yrast States". United States. doi:10.1063/1.2187880.
@article{osti_20798311,
title = {Level Dynamics of non-yrast States},
author = {Jolie, J. and Heinze, S.},
abstractNote = {We present a systematic study of the dynamics of non-yrast states using a simple but physically relevant hamiltonian. The emphasis is put on the behavior of 0+ states. When the transition takes place between spherical and gamma-soft nuclei level bunching occurs which is related to the conserved seniority. Similar behavior occurs in the regular region which is not directly connected with the known symmetries. In between spherical and prolate nuclei a sharp increase in the level density of 0+ states is found. We report on recent (p,t) transfer reactions related to these topics which were performed at the Q3D spectrometer in Garching with the aim to measure the 0+ states in a complete way up to high energy.},
doi = {10.1063/1.2187880},
journal = {AIP Conference Proceedings},
number = 1,
volume = 819,
place = {United States},
year = {Mon Mar 13 00:00:00 EST 2006},
month = {Mon Mar 13 00:00:00 EST 2006}
}
  • No abstract prepared.
  • The structure of /sup 98/Ru was studied using the /sup 97/Mo(/sup 3/He,2n..gamma..) /sup 98/Ru reaction, which populated many non-yrast states that had not been observed previously. The experiments included ..gamma..-ray excitation functions, angular distributions, linear polarizations, and ..gamma..-..gamma.. coincidences. It is shown that low-lying non-yrast states in this transitional nucleus can be described in a rotational framework without using a vibrational degree of freedom. The interpretation used a model with two quasiparticles coupled to a symmetric rotor. A surface-delta residual interaction was included.
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  • We have identified yrast states of /sup 152/Dy to spin approx.37, with unusually strong population of high-spin states in the (/sup 32/S, 4n..gamma..) reaction. Yrast isomers with spins approx.17, 21, 27, and 31 were detected. For I > or = 14 the yrast states scatter about a straight line on an E vs I (I + 1) plot, consistent with predictions for aligned-particle configurations. The slope of the line yields an effective moment of inertia 18% larger than the rigid-sphere value. This and other arguments suggest possible oblate deformation at high spin.