Isomer Tagging with a Dual Multi-Wire Proportional Counter and a Differential Plunger

Journal Article · Mon May 12 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2939299· OSTI ID:21143350

Cullen, D M; Mason, P J. R.; Khan, S; Kishada, A M; Varley, B J ^[1]; Rigby, S V ^[1]; Scholey, C; Greenlees, P; Rahkila, P; Jones, P M; Julin, R; Juutinen, S; Leino, M; Leppaenen, A P; Nyman, M; Uusitalo, J ^[2]; Grahn, T; Pakarinen, J ^[2]; Nieminen, P ^[2]

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1. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)
2. Department of Physics, University of Jyvaeskylae, Jyvaeskylae, FIN-40014 (Finland)

This report details the status of an experimental research programme which has studied isomeric states in the mass 130-160 region of the nuclear chart. Several new isomers have been established and characterised near the proton drip line using a recoil isomer tagging technique at the University of Jyvaeskylae, Finland. The latest experiments have been performed with a modified setup where the standard GREAT focal-plane double-sided silicon-strip detector was changed to a dual multi-wire proportional-counter arrangement. This new setup has improved capability for short-lived isomer studies where large focal-plane rates can be tolerated. The results of key recent experiments for nuclei situated above ({sup 153}Yb, {sup 152}Tm) and below ({sup 144}Ho, {sup 142}Tb) the N = 82 shell gap were presented. These studies have charted the evolution of isomeric states across the neutron shell from K-Isomers at N = 74, to shape isomers at N = 77 and shell-model isomers at N = 82, 83. The excitation energies for some of the lowest-lying excited states in these isomeric nuclei show behaviour which is characteristic of an X(5) symmetry falling midway between the limits expected for pure vibrational and rotational behaviour. The future prospects for studies of these nuclei were discussed using an isomer-tagged differential-plunger setup. This technique will be capable of establishing the deformation of the states above the isomers and will aid in determining whether their behaviour is indeed well described by the X(5) symmetry limit.

• OSTI ID: 21143350
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1012; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EXCITATION
EXCITED STATES
GAMMA RADIATION
HOLMIUM 144
ISOMERIC NUCLEI
MULTIWIRE PROPORTIONAL CHAMBERS
NEUTRONS
NUCLEAR STRUCTURE
PROTONS
RECOILS
SHELL MODELS
SI MICROSTRIP DETECTORS
SYMMETRY
TERBIUM 142
THULIUM 152
YTTERBIUM 153