Proton-neutron structure of the N=52 nucleus Zr-92

V Werner, D Belic, P von Brentano, C Fransen, A Gade, H von Garrel, J Jolie, U Kneissl, C Kohstall, A Linnemann, AF Lisetskiy, N Pietralla, HH Pitz, M Scheck, KH Speidel, F Stedile, SW Yates

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95 Citations (Scopus)

Abstract

Following the successful identification of mixed-symmetric one- and two-phonon states in the N=52 nuclei 94Mo and 96Ru, we have performed a photon scattering experiment on the N=52 isotone 92Zr. Experimental data and shell model calculations show that both, single particle and collective degrees of freedom are present in the low-lying levels of 92Zr. The second excited quadrupole state shows the signatures of the one-phonon mixed-symmetric 2+ state, while calculations and data indicate an almost pure neutron configuration for the 2+1 state, in contradiction with the F-spin symmetric limit. Furthermore, two strong dipole excitations, which are candidates for the two-phonon quadrupole–octupole coupled E1 excitation and for the mixed-symmetric 1+ two-phonon state, were observed.
Original languageEnglish
Pages (from-to)140-146
JournalPhysics Letters B
Volume550
Issue number3-4
DOIs
Publication statusPublished - 19 Dec 2002
Externally publishedYes

Keywords

  • Zr-92
  • NRF
  • (gamma, gamma ')
  • shell model
  • mixed symmetry
  • IBM
  • A=92

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