## Abstract

The systematics of the even light Po isotopes (N ≤ 126) are studied in the framework of the Particle-Core Model. The strong perturbation of the systematics in the very light isotopes is interpreted as arising from the interaction between regular and intruder structures. Results of Potential Energy Surface (PES) calculations and predictions of the Pairing Vibration Model support this interpretation. The mixing between the regular and intruder structures is studied within the IBM-2 and in a simple two-state mixing picture. Matrix elements of the interaction and their spin dependence are extracted. The 'reconstructed systematics' show the coexistence of a spherical structure, which varies little with the neutron number, with an intruder band, strongly lowered in energy as the neutron number approaches midshell. The crossing of the two configurations takes place over a few isotopes; the intruder band becomes the ground-state configuration in ^{192}Po.

Original language | English (US) |
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Pages (from-to) | 107-142 |

Number of pages | 36 |

Journal | Nuclear Physics A |

Volume | 645 |

Issue number | 1 |

DOIs | |

State | Published - Jan 4 1999 |

Externally published | Yes |

## Keywords

- IBM-2 calculations
- Light Po isotopes, shape coexistence studied
- Mixing between intruder and regular configuration extracted
- Nuclear structure
- Pairing vibration model
- Particle-core model
- Potential energy surface calculations

## ASJC Scopus subject areas

- Nuclear and High Energy Physics