Probing the Collective Degrees of Freedom at the Proton Drip Line in the Extremely Neutron Deficient {sup 172}Hg

Journal Article · Wed Nov 30 04:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3664145· OSTI ID:22003883

Sandzelius, M ^[1]; Cederwall, B; Hadinia, B; Andgren, K; Baeck, T; Johnson, A; Khaplanov, A; Wyss, R ^[2]; Ganioglu, E ^[2]; Grahn, T; Greenlees, P T; Jakobsson, U; Jones, P M; Julin, R; Juutinen, S; Ketelhut, S; Leino, M; Nyman, M; Peura, P; Rahkila, P ^[1] ; others, and

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1. Department of Physics, University of Jyvaeskylae, FIN-40014 Jyvaeskylae (Finland)
2. Department of Physics, Royal Institute of Technology, S-10691 Stockholm (Sweden)

Excited states in the extremely neutron-deficient isotope {sup 172}Hg have been established for the first time. The {sup 96}Ru({sup 78}Kr,2n) reaction was employed to populate excited states in {sup 172}Hg with a cross section {sigma}{approx_equal} 15 nb. The highly selective Recoil-Decay Tagging (RDT) technique was used to obtain clean in-beam {gamma}-ray spectra for {sup 172}Hg. The yrast ground-state band has tentatively been established up to I = 6h-bar. The data have been interpreted within the framework of total Routhian surface and quasiparticle random phase approximation calculations. In addition to the well-known features of shape coexistence previously observed in light Hg isotopes, the systematic trends in the energy of the yrast 2{sup +} and 4{sup +} states in the chain of Hg isotopes indicate a pronounced vibrational collectivity which is reduced in strength, but at the same time shows a higher degree of harmonicity, as the neutron number decreases below the neutron midshell.

• OSTI ID: 22003883
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1409; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
DEGREES OF FREEDOM
EXCITED STATES
GROUND STATES
HEAVY ION REACTIONS
HYDROGEN 6
IN-BEAM SPECTROSCOPY
KRYPTON 78
MERCURY 172
NEUTRON-DEFICIENT ISOTOPES
NEUTRONS
NUCLEAR STRUCTURE
PROTONS
QUASI PARTICLES
RANDOM PHASE APPROXIMATION
RECOILS
RUTHENIUM 96
YRAST STATES