Universität zu Köln

Coombes, B. J., Stuchbery, A. E., Blazhev, A., Grawe, H., Reed, M. W., Akber, A., Dowie, J. T. H., Gerathy, M. S. M., Gray, T. J., Kibedi, T., Mitchell, A. J. and Palazzo, T. (2019). Spectroscopy and excited-state g factors in weakly collective Cd-111: Confronting collective and microscopic models. Phys. Rev. C, 100 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: The even cadmium isotopes near the neutron midshell have long been considered among the best examples of vibrational nuclei. However, the vibrational nature of these nuclei has been questioned based on E2 transition rates that are not consistent with vibrational excitations. In the neighboring odd-mass nuclei, the g factors of the low-excitation collective states have been shown to be more consistent with a deformed rotational core than a vibrational core. Moving beyond the comparison of vibrational versus rotational models, recent advances in computational power have made shell-model calculations feasible for Cd isotopes. These calculations may give insights into the emergence and nature of collectivity in the Cd isotopes. Purpose: To investigate the nature of collective excitations in the A approximate to 100 region through experimental and theoretical studies of magnetic moments and electromagnetic transitions in Cd-111. Method: The spectroscopy of Cd-111 has been studied following Coulomb excitation. Angular correlation measurements, transient-field g-factor measurements and lifetime measurements by the Doppler-broadened line shape method were performed. The structure of the nucleus was explored in relation to particle-vibration versus particle-rotor interpretations. Large-scale shell-model calculations were performed with the SR88MHJM Hamiltonian. Results: Excited-state g factors have been measured, spin assignments examined, and lifetimes determined. Attention was given to the reported 5/2(+) 753-keV and 3/2(+) 755-keV states. The 3/2(+) 755-keV level was not observed; evidence is presented that the reported 3/2(+) state was a misidentification of the 5/2(+) 753-keV state. Conclusions: It is shown that the g factors and level structure of Cd-111 are not readily explained by the particle-vibration model. A particle-rotor approach has both successes and limitations. The shell-model approach successfully reproduces much of the known low-excitation structure in Cd-111.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Coombes, B. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stuchbery, A. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blazhev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grawe, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reed, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Akber, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dowie, J. T. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerathy, M. S. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gray, T. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kibedi, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mitchell, A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palazzo, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-144373
DOI:	10.1103/PhysRevC.100.024322
Journal or Publication Title:	Phys. Rev. C
Volume:	100
Number:	2
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-DATA SHEETS; COULOMB-EXCITATION; QUADRUPOLE-MOMENTS; DEPENDENCE; ISOTOPES; PD Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14437