Shape coexistence in the light Po isotopes

A. M. Orosa; K. Heyde; C. De Coster; B. Decroix; R. Wyss; B. R. Barrett; P. Navratil

doi:10.1016/s0375-9474(98)00602-2

Shape coexistence in the light Po isotopes

A. M. Orosa, K. Heyde, C. De Coster, B. Decroix, R. Wyss, B. R. Barrett, P. Navratil

Physics

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

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 ¹⁹²Po.

Original language	English (US)
Pages (from-to)	107-142
Number of pages	36
Journal	Nuclear Physics A
Volume	645
Issue number	1
DOIs	https://doi.org/10.1016/s0375-9474(98)00602-2
State	Published - Jan 4 1999

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

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10.1016/s0375-9474(98)00602-2

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title = "Shape coexistence in the light Po isotopes",

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 192Po.",

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",

author = "Orosa, {A. M.} and K. Heyde and {De Coster}, C. and B. Decroix and R. Wyss and Barrett, {B. R.} and P. Navratil",

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AU - Orosa, A. M.

AU - Heyde, K.

AU - De Coster, C.

AU - Decroix, B.

AU - Wyss, R.

AU - Barrett, B. R.

AU - Navratil, P.

PY - 1999/1/4

Y1 - 1999/1/4

N2 - 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 192Po.

AB - 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 192Po.

KW - IBM-2 calculations

KW - Light Po isotopes, shape coexistence studied

KW - Mixing between intruder and regular configuration extracted

KW - Nuclear structure

KW - Pairing vibration model

KW - Particle-core model

KW - Potential energy surface calculations

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JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1

ER -

Shape coexistence in the light Po isotopes

Abstract

Keywords

ASJC Scopus subject areas

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