Advances Toward and Beyond the Proton Drip line with Recoil-Isomer Tagging

Journal Article · Wed Apr 26 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2200954· OSTI ID:20798563

Cullen, D M; Rigby, S V; Scholes, D T ^[1]; Scholey, C; Rahkila, P; Eeckhaudt, S; Grahn, T; Greenlees, P; Jones, P M; Julin, R; Juutinen, S; Kettunen, H; Leino, M; Leppaenen, A; Nieminen, P; Nyman, M; Pakarinen, J; Uusitalo, J ^[2]

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1. Schuster Laboratory, 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 paper reviews the past, present and future status of recoil-isomer tagging at the University of Jyvaeskylae. The main focus of this research has been to access isomeric states at and beyond the mass {approx_equal}140 proton drip line. Recoil-isomer tagging was first used at the University of Jyvaeskylae in 1998 to establish the prompt rotational band built upon a K{pi} = 8- isomeric state in 138Gd. Since that time a series of experiments have been performed which have studied isomeric states in the N = 77 isotones {sub 63}{sup 140}Eu{sub 77}, {sub 65}{sup 142}Tb{sub 77} and {sub 67}{sup 144}Ho{sub 77}, and in the N = 74 K-isomer chain, {sub 64}{sup 138}Gd{sub 74} and {sub 66}{sup 140}Dy{sub 74}. These experiments have revealed valuable first information about deformations, single-particle excitation energies and hindrance factors in nuclei at and beyond the proton drip line where little or no information previously existed.The results of the most-recent experiments were discussed. These experiments established new isomeric states in {sub 66}{sup 143}Dy{sub 77}, {sub 61}{sup 136}Pm{sub 75}, and {sub 64}{sup 137}Gd{sub 73} and a further two isomers which are currently unplaced. The paper concludes with a discussion of the future prospects for this research including the increased efficiency of the recoil-isomer tagging technique with a new Multi-Wire Proportional Counter (MWPC) detector which was designed and built at the University of Manchester. The first results from this new setup were shown.

• OSTI ID: 20798563
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 831; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EFFICIENCY
EUROPIUM 140
EXCITATION
GADOLINIUM 138
GADOLINIUM 149
HOLMIUM 144
ISOTONIC NUCLEI
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEAR DEFORMATION
PROTONS
RECOILS
REVIEWS
ROTATIONAL STATES
SINGLE-PARTICLE MODEL