## Abstract

Following the successful identification of mixed-symmetric one- and two-phonon states in the N = 52 nuclei ^{94}Mo and ^{96}Ru, we have performed a photon scattering experiment on the N = 52 isotone ^{92}Zr. Experimental data and shell model calculations show that both, single particle and collective degrees of freedom are present in the low-lying levels of ^{92}Zr. 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 language | English |
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Pages (from-to) | 140-146 |

Number of pages | 7 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 550 |

Issue number | 3-4 |

DOIs | |

State | Published - Dec 19 2002 |

### Bibliographical note

Funding Information:For discussions the authors thank R.F. Casten, F. Iachello, T. Otsuka and R. Schwengner and we thank H. Klein for the Rits-Tk interface. This work was supported by the Deutsche Forschungsgemeinschaft under contracts Br 799/11-1, Kn 154/30 and Pi 393/1-2.

## Keywords

- (γ, γ′)
- A = 92
- IBM
- Mixed symmetry
- NRF
- Shell model
- Zr

## ASJC Scopus subject areas

- Nuclear and High Energy Physics

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