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Shell model with several particles in the continuum: application to the two-proton decay; Modele en couches avec plusieurs particules dans le continuum: description de la radioactivite deux protons

Abstract

The recent experimental results concerning nuclei at the limit of stability close to the drip-lines and in particular the two-proton emitters require a development of new methodologies to reliably calculate and understand properties of those exotic physical systems. In this work we have extended the Shell Model Embedded in the Continuum (SMEC) in order to describe the coupling with two particles in the scattering continuum. We have obtained a microscopic description of the two-proton emission that takes into account the antisymmetrization of the total wavefunction, the configuration mixing and the three-body asymptotics. We have studied the decay of the 1{sub 2}{sup -} state in {sup 18}Ne in two limiting cases: (i) a sequential emission of two protons through the correlated continuum of {sup 17}F and (ii) emission of {sup 2}He cluster that disintegrates because of the final state interaction (diproton emission). Independently of the choice of the effective interaction we have observed that the two-proton emission of the 1{sub 2}{sup -} in {sup 18}Ne is mainly a sequential process; the ratio between the widths of the diproton emission and the sequential decay does not exceed 8% in any case. (author)
Authors:
Publication Date:
Feb 15, 2005
Product Type:
Thesis/Dissertation
Report Number:
GANIL-T-05-01
Resource Relation:
Other Information: TH: These constituants elementaires; 110 refs
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY LEVELS; FLUORINE 17; HELIUM 2; NEON 18; NUCLEAR STRUCTURE; PROTON-EMISSION DECAY; SHELL MODELS; THREE-BODY PROBLEM
OSTI ID:
20754774
Research Organizations:
Caen Univ., 14 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0601455062572
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
110 pages
Announcement Date:
Aug 11, 2006

Citation Formats

Rotureau, J. Shell model with several particles in the continuum: application to the two-proton decay; Modele en couches avec plusieurs particules dans le continuum: description de la radioactivite deux protons. France: N. p., 2005. Web.
Rotureau, J. Shell model with several particles in the continuum: application to the two-proton decay; Modele en couches avec plusieurs particules dans le continuum: description de la radioactivite deux protons. France.
Rotureau, J. 2005. "Shell model with several particles in the continuum: application to the two-proton decay; Modele en couches avec plusieurs particules dans le continuum: description de la radioactivite deux protons." France.
@misc{etde_20754774,
title = {Shell model with several particles in the continuum: application to the two-proton decay; Modele en couches avec plusieurs particules dans le continuum: description de la radioactivite deux protons}
author = {Rotureau, J}
abstractNote = {The recent experimental results concerning nuclei at the limit of stability close to the drip-lines and in particular the two-proton emitters require a development of new methodologies to reliably calculate and understand properties of those exotic physical systems. In this work we have extended the Shell Model Embedded in the Continuum (SMEC) in order to describe the coupling with two particles in the scattering continuum. We have obtained a microscopic description of the two-proton emission that takes into account the antisymmetrization of the total wavefunction, the configuration mixing and the three-body asymptotics. We have studied the decay of the 1{sub 2}{sup -} state in {sup 18}Ne in two limiting cases: (i) a sequential emission of two protons through the correlated continuum of {sup 17}F and (ii) emission of {sup 2}He cluster that disintegrates because of the final state interaction (diproton emission). Independently of the choice of the effective interaction we have observed that the two-proton emission of the 1{sub 2}{sup -} in {sup 18}Ne is mainly a sequential process; the ratio between the widths of the diproton emission and the sequential decay does not exceed 8% in any case. (author)}
place = {France}
year = {2005}
month = {Feb}
}