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Project List » Gamma-ray spectroscopy studies of the evolution of intruder configuration towards the N=20 'island of inversion' |
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Gamma-ray spectroscopy studies of the evolution of intruder configuration towards the N=20 'island of inversion'
www.nipne.ro/proiecte/pn4/11-projects.html
Acronym: INVERSION-N20
Contracting Authority: UEFISCDI
Number / Date of the contract: 42 TE / 2025-01-08
Program: PNCDI IV
Project Manager: Razvan Lica
Partners:
Starting date / finishing date: 2025-01-08 / 2026-12-31
Project value: 500.000 RONAbstract: Nuclear deformation and shape coexistence have been prominent subjects within the field of nuclear structure for over 50 years. An expanding stream of experimental data has demonstrated the disappearance and/or the development of new magic numbers, representing shell closures, as nuclei move further away from stability. A particular manifestation of such phenomena and currently a 'hot' topic in the exotic nuclear landscape is the emergence of the "Islands of Inversion" where deformed 'intruder' configurations are more energetically favored compared to their spherical 'normal' counterparts. This project proposes a complex experimental study through gamma-ray spectroscopy using the ROSPHERE detector array at the 9MV Tandem Accelerator of IFIN-HH, which aims to study excited states of nuclei in the vicinity of the N=20 "Island of Inversion" where 0+ states dominated by deformed intruder configurations are theoretically predicted. The objectives of this project are to investigate the presence of the first intruder 0+ states in the 32Si (N=20-2) and 38S (N=20+2) nuclei, thus determining the evolution of nuclear deformation and shape coexistence in the N=20 "Island of Inversion" region and contributing to the validation and further development of theoretical shell-model calculations. The project represents the continuation of a successfully concluded study performed at the radioactive ion-beam facility ISOLDE-CERN, Switzerland, where the 34Si and 34Al nuclei were studied.
Objectives: 1. Measure experimentally for the first time the nuclear half-life of the intruder 0+ state in 32Si (N=20-2) and interpret the results using shell-model calculations that employ the state-of-the-art interactions able to describe particle-hole excitations across the N=20 sd-pf shell gap.
2. Investigate through gamma-ray spectroscopy the presently unknown excitation energy of the intruder 0+ state in 38S (N=20+2) and furthermore establish the grounds for future experiments dedicated to the measurement of its half-life.
THE STAGES OF THE PROJECT AND DELIVERY DATES
1. Experimental measurements for 32Si. Experiment preparation for 38S. (2025-12-31)
2. Experimental measurements and data analysis for 38S. (2026-12-31)
RESULTS
PUBLISHED ARTICLES
RESEARCH TEAM
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