Article

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, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomD J G LoveDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomP J BishopDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomA KirwanDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomD J ThornleyDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomL. YingDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomR. WadsworthDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, United KingdomJ. M. O’DonnellDepartment of Physics, Schuster Laboratory, The University, Manchester M13 9PL, 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

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Abstract

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 ${\ensuremath{\epsilon}}_{2}\ensuremath{\gtrsim}0.3$.

Identifiers

DOI: 10.1103/physrevlett.55.810

Citations and references

Cited by 30 references

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