Elsevier

Nuclear Physics A

Volume 365, Issue 1, 20 July 1981, Pages 26-60
Nuclear Physics A

The rotational structure of 227Ra

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Abstract

The level structure of 227Ra has been studied using the (n, γ), (d, p) and (t, d) reactions and the β decay of 227Fr. A model-independent level scheme was established including 28 levels below 1500 keV. Cross sections and excitation energies have been measured for 72 levels below 2.5 MeV and analysing powers have been measured for 25 levels below 1.4 MeV. The level structure is interpreted in terms of the Nilsson model. The ground-state configuration is 32+[631↑] and the first excited band [633↓] starts at 1.7 keV. Several octupole vibrations coupled to single-particle configurations are tentatively assigned above 280 keV. The neutron binding energy was determined to be 4561.41 ± 0.27 keV. The half-life of 227Fr was measured to be 148 ± 2 s.

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    Present address: National Research Council of Canada, Ottawa, Ontario, Canada.

    ††

    Present address: Brookhaven National Laboratory, Upton, NY, USA.

    Permanent address: Department of Nuclear Chemistry, University of Oslo, Oslo 3, Norway.

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