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Deformation of Very Light Rare-Earth Nuclei

C. J. ListerDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomB. J. VarleyDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomRobert MoscropDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomW. GelletlyDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomP. NolanDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United KingdomD J G LoveDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United KingdomP J BishopDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomA KirwanDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United KingdomD J ThornleyDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United KingdomL. YingDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United KingdomR. WadsworthDepartment of Physics, University of Bradford, Bradford BD7 1DP, United KingdomJ. M. O’DonnellDepartment of Physics, University of Bradford, Bradford BD7 1DP, United KingdomH.G. PriceDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomA H NelsonDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United Kingdom

1985en

ABI

Annotatsiya

Gamma-ray spectra of neutron-deficient isotopes between cerium ($Z=58$) and gadolinium ($Z=64$) have been investigated. New bands of states were identified in many even-even, odd-$A$, and odd-odd nuclei. This Letter reports results on the ground-state bands in the even-even nuclei $_{58}^{126}\mathrm{Ce}_{68}$, $_{60}^{128,\phantom{\rule{0ex}{0ex}}130,\phantom{\rule{0ex}{0ex}}132}\mathrm{Nd}_{68,\phantom{\rule{0ex}{0ex}}70,\phantom{\rule{0ex}{0ex}}72}$, $_{62}^{134,\phantom{\rule{0ex}{0ex}}136}\mathrm{Sm}_{72,\phantom{\rule{0ex}{0ex}}74}$, and $_{64}^{138,\phantom{\rule{0ex}{0ex}}140}\mathrm{Gd}_{74,\phantom{\rule{0ex}{0ex}}76}$. The systematic trends of deformation are presented and compared with theoretical predictions. The lightest isotopes appear to be axially symmetric rotors with ${\ensuremath{\epsilon}}_{2}\ensuremath{\gtrsim}0.3$.

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DOI: 10.1103/physrevlett.55.810

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