Possible shears bands in {sup 204}At and {sup 206}Fr, and identification of excited states in {sup 205,207}Fr

Journal Article · Sat Nov 15 00:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.054319· OSTI ID:21199368

Hartley, D J; Seyfried, E P; Reviol, W; Sarantites, D G; Chiara, C J; Pechenaya, O L; Hauschild, K; Lopez-Martens, A; Carpenter, M P; Janssens, R V. F.; Seweryniak, D; Zhu, S ^[1]

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1. Department of Physics, U.S. Naval Academy, Annapolis, Maryland 21402 (United States)

Neutron-deficient astatine and francium nuclei were produced in the reaction {sup 30}Si+{sup 181}Ta{yields}{sup 211}Fr* at 152 MeV. The evaporation residues from this very fissile system were selected with the HERCULES-II detector system and residue-gated {gamma} rays were measured with Gammasphere. Excited states were observed for the first time in {sup 205,207}Fr, as well as sequences of low-energy transitions between high-spin states in {sup 204}At and {sup 206}Fr. These latter structures have properties similar to those associated with magnetic rotation (shears bands) in lead nuclei. Comparisons with established shears bands are presented and prospects for the magnetic-rotation phenomenon near the predicted N=120''magic'' number are explored.

• OSTI ID: 21199368
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 5; Other Information: DOI: 10.1103/PhysRevC.78.054319; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTATINE 204
COMPARATIVE EVALUATIONS
EVAPORATION
EXCITED STATES
FRANCIUM 205
FRANCIUM 206
FRANCIUM 207
FRANCIUM 211
GAMMA RADIATION
HIGH SPIN STATES
LEAD
MEV RANGE 100-1000
NEUTRON-DEFICIENT ISOTOPES
NEUTRONS
NUCLEAR REACTIONS
RESIDUES
ROTATION
SILICON 30
TANTALUM 181