Sizeable mixing between the coexisting normal and intruder structures of Zr 96 revealed through lifetime measurements

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Abstract
Lifetimes of excited states of the nucleus Zr 96 were studied with the Doppler-shift attenuation method following the Zr 94 ( O 18 , O 16 ) Zr 96 two-neutron transfer reaction. The obtained B ( E 2 ; 2 2 + → 0 2 + ) and B ( E 2 ; 4 1 + → 2 2 + ) transition strengths, amounting to 26 ( 2 ) and 39 ( 7 ) W . u . , respectively, firmly attribute the 2 2 + and 4 1 + states to the collective intruder band built on top of the 0 2 + state. The nature of this structure is discussed against predictions of the collective model using the Bohr Hamiltonian, the interacting boson model with configuration mixing, and the quasiparticle vacua shell model. The collective, interband B ( E 2 ; 4 1 + → 2 1 + ) = 11.2 ( 8 ) W . u . transition strength, refuting the previously assumed purity of both structures, is reproduced in the calculations. The quasiparticle vacua shell model predicts, in agreement with a simple two-state model based on experimental E 2 transition strengths, considerable mixing between the normal and intruder 2 + states.
Funding Information
  • Bundesministerium für Forschung, Technologie und Raumfahrt (05P18RDEN9)
  • Bundesministerium für Forschung, Technologie und Raumfahrt (05P18RDFN1/9)
  • Deutsche Forschungsgemeinschaft (499256822)
  • Institutul de Fizică Atomică (ELI-RO/DFG/2023_001)
  • Ministry of Education, Culture, Sports, Science and Technology (JPMXP1020200105)
  • Ministry of Education, Culture, Sports, Science and Technology (JPMXP1020230411)
  • Japan Society for the Promotion of Science (JP22K14031)
  • Japan Society for the Promotion of Science (JP25K17404)
  • RIKEN Center for Computational Science (hp230137)
  • RIKEN Center for Computational Science (hp250187)
  • Horizon 2020 (654002)
  • Romanian National Authority for Research (PN 23 21 01 02)

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