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The nuclear structure of 227Fr

W. KurcewiczDepartment of Physics, Warsaw University, Pl-00 681 Warsaw, PolandI. S. GrantThe Schuster Laboratory, Manchester University, Manchester M13 9PL, UKK. GuldaDepartment of Physics, Warsaw University, Pl-00 681 Warsaw, PolandA. J.Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, NorwayJ. BillowesThe Schuster Laboratory, Manchester University, Manchester M13 9PL, UKM.J.G. BorgeInstitute of the Structure of Matter, CSIC, E-28006 Madrid, SpainD. G. BurkeDepartment of Physics, McMaster University, Hamilton, Ontario, L8S 4K1, CanadaP. A. ButlerOliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UKJ. F. C. CocksOliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UKB. FogelbergDepartment of Neutron Research, University of Uppsala, S-61182 Nyköping, SwedenS. J. FreemanThe Schuster Laboratory, Manchester University, Manchester M13 9PL, UKGraeme JonesOliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UKE. HagebøDepartment of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, NorwayP. HoffDepartment of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, NorwayJ. HønsiOliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UKA. LindrothDepartment of Neutron Research, University of Uppsala, S-61182 Nyköping, SwedenG. LøvhøidenDepartment of Physics, University of Oslo, P.O. Box 1048, Blindern, N-0316 Oslo, NorwayH. MachDepartment of Neutron Research, University of Uppsala, S-61182 Nyköping, SwedenT. MartínezInstitute of Subatomic Physics, CSIC University Valencia, E-46100, Burjassot, SpainR. A. NaumannDepartment of Physics, Dartmouth College, Hanover, NH 03755, USAKristie NyboDepartment of Physics, Univ. of Bergen, N-5000 Bergen (Norway)G. NymanH.L. RavnPPE Division, CERN, CH-1211 Geneva-23, SwitzerlandB. RubioInstitute of Subatomic Physics, CSIC University Valencia, E-46100, Burjassot, SpainJ. SimpsonCCLRC, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UKA. G. SmithThe Schuster Laboratory, Manchester University, Manchester M13 9PL, UKJ. F. SmithOliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UKK. SteffensenDepartment of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, NorwayJ. L. Taı́nInstitute of Subatomic Physics, CSIC University Valencia, E-46100, Burjassot, SpainO. TengbladPPE Division, CERN, CH-1211 Geneva-23, SwitzerlandT.F. ThorsteinsenDepartment of Physics, Univ. of Bergen, N-5000 Bergen (Norway)

Nuclear Physics Ajournal1997en

ABI

Аннотация

The γ-rays following the β− decay of 227Rn have been investigated by means of γ-ray singles and γγ-coincidence measurements using an array of 12 Compton-suppressed Ge detectors. The fast-timing βγγ(t) method has been used to measure six level lifetimes. Multipolarities of 32 transitions in 227Fr have been established by measuring conversion electrons with a mini-orange electron spectrometer. Most of the observed transitions have been placed in a level scheme comprising 38 excited states of 227Fr. The low-lying levels are interpreted in terms of seven rotational bands. The observed E1 strengths for two transitions connecting the Kπ = 32± bands are consistent with the transitional character of 227Fr, and confirm the presence of octupole correlations in this nucleus.

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Nuclear physics research studies Astronomical and nuclear sciences Atomic and Molecular Physics

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DOI: 10.1016/s0375-9474(97)00190-5

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