Magnetic rotation in Pb-197 and Pb-198

A Gorgen, N Nenoff, H Hubel, G Baldsiefen, J A Becker, A P Byrne, S Chmel, R M Clark, M A Deleplanque, R M Diamond, P Fallon, K Hauschild, I M Hibbert, W Korten, R Krucken, I Y Lee, A O Macchiavelli, E S Paul, U J van Severen, F S StephensK Vetter, R Wadsworth, A N Wilson, J N Wilson

Research output: Contribution to journalArticlepeer-review

Abstract

High-spin states in Pb-197 and Pb-198 were populated in the W-186(O-18, xn) reactions. In-beam gamma -ray coincidences were measured in two experiments using the GAMMASPHERE and the EUROGAM Il spectrometer arrays, respectively. In both nuclei new bands of enhanced magnetic dipole transitions were found and the known cascades were partly reordered and extended to higher spins. In most cases, gamma -ray transitions connecting the magnetic rotational bands to lower-lying states have been identified. Configuration assignments are suggested for the bands. The systematic behavior confirms the shears mechanism. An effective interaction between the main high-spin proton and neutron orbitals is derived. (C) 2001 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)108-144
Number of pages37
JournalNuclear Physics A
Volume683
Publication statusPublished - 26 Feb 2001

Keywords

  • W-186(O-18,xn)
  • E=104, 110, 115 MeV
  • measured gamma gamma-coincidences
  • E gamma
  • DCO ratios
  • linear polarization
  • Pb-197,Pb-198 deduced levels
  • magnetic dipole bands
  • magnetic rotation
  • SHEARS BANDS
  • DIPOLE BANDS
  • PB ISOTOPES
  • MECHANISM
  • STATES
  • NUCLEI
  • PB-197,PB-198
  • LIFETIMES
  • PB-201

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