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Project List » Study of Z=28 shell gap by the tensor force in neutron-rich isotopes

Study of Z=28 shell gap by the tensor force in neutron-rich isotopes

Acronym: Idei-126
Contracting Authority: Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI)
Number / Date of the contract: 126 (PN-II-ID-PCE-2011-3-0487) / 2011-10-05
Project Manager: Mihai Stanoiu
Partners: -
Starting date / finishing date: 2011-10-05 / 2016-10-04
Project value: 1500000 RON
Abstract: The present proposal is devoted to the study of the structure of neutron-rich nuclei in the vicinity of N=40. Shell structure predictions towards the neutron and proton drip-lines provide indispensable input to model the rapid neutron and proton capture for nucleosynthesis processes. Furthermore, the evolution of shell structure far from stability line has become a key topic of nuclear structure studies as it is intimately related to the monopole part of the residual nucleon-nucleon interaction and its origin in one-boson exchange potentials. For instance, shell gap evolutions have been recently ascribed to the strongly attractive (repulsive) tensor force acting between protons and neutrons with opposite (similar) orientation of their intrinsic spin with respect to their angular momentum. In this new light, the importance of gaining a better understanding of the evolution of nuclear structure along the nickel isotopic chain far from stability should not be understated. The shell model puts forward a magic nature for 78Ni, but an experimental assessment is still out of reach. Yet a departure from the conjectured rigidity of 78Ni is likely to affect its neighboring nuclei and the quest for observable signatures drives many experimental efforts at nuclear physics laboratories worldwide. One of the major aims of this project is to study the evolution of the neutron g9/2 orbital with increasing number of neutrons which is one of the key points defining the structure of these nuclei at low excitation energy. For this purpose we aim to combine CE and gamma spectroscopy method to establish the multipolarity of transitions and firmly assign the spins of neutron rich nuclei below 78Ni.

Objectives: The aim of the project is to study neutron rich nuclei in order to obtain information about the monopole interaction (n-p) by filling the uni-particle shells.
Estimated results:
- Performing experiments of combined gamma/electron spectroscopy to identify level schemes in neutron rich nuclei around Z=28.
- Performing shell model calculations
to describe the obtained results. - Results dissemination.

1. Calculation of production rates and settings of the spectrometer in order to produce the nuclei of interest and perform the gamma and conversion electron experiment. Calculation of material thickness for optimum identification, stopping and implantation of the nuclei. Simulation of detection eficiency. (2011-12-15)
2. Preparation and execution of the combined gamma and conversion electron experiment for isomeric states in exotic nuclei in the region Z=28 (2012-12-15)
3. Analysis of experimental data, building of level schemes for 75Cu and 78Ga, dissemination of preliminary results, participation in conferences. (2013-12-15)
4. Initiation of theoretical calculations, Preliminary comparison of experimental results with theoretical predictions, dissemination of results (2014-12-15)
5. Theoretical model calculations, data comparison. (2015-10-04) Results
6. Full data analysis, final comparison of data with theoretical models, dissemination of results. (2016-10-04)

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