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Title: N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe

Abstract

To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2{sub 1}{sup +} inelastic scattering angular distributions for the neutron-rich nucleus {sup 22}O were measured using the MUr a STrip detector array at the Grand Accelerateur National d'Ions Lourds facility. A deformation parameter {beta}{sub p,p{sup '}}=0.26{+-}0.04 is obtained for the 2{sub 1}{sup +} state, much lower than in {sup 20}O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. The ratio of neutron to proton contributions to the 2{sub 1}{sup +} state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip line.

Authors:
; ; ; ; ; ; ;  [1]; ; ;  [2]; ; ;  [3]; ; ; ; ; ;  [4]
  1. Institut de Physique Nucleaire, IN2P3-CNRS, 91406 Orsay (France)
  2. DPTA/SPN-CEA Bruyeres, 91680 Bruyeres-le-Chatel Cedex 12 (France)
  3. GANIL (CEA/DSM-CNRS/IN2P3), B.P. 5027, 14076 Caen Cedex (France)
  4. SPhN, DAPNIA, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
Publication Date:
OSTI Identifier:
20775008
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevLett.96.012501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR DISTRIBUTION; ELASTIC SCATTERING; HARTREE-FOCK METHOD; HARTREE-FOCK-BOGOLYUBOV THEORY; INELASTIC SCATTERING; NEUTRON-RICH ISOTOPES; NEUTRONS; NUCLEAR FORCES; OPTICAL MODELS; OXYGEN 20; OXYGEN 22; PROTON-NUCLEON INTERACTIONS; PROTONS; RANDOM PHASE APPROXIMATION; SHELL MODELS; SKYRME POTENTIAL

Citation Formats

Becheva, E, Blumenfeld, Y, Khan, E, Beaumel, D, Delaunay, F, Fallot, M, Lima, V, Scarpaci, J A, Daugas, J M, Roig, O, Sauvestre, J E, Demonchy, Ch-E, Giot, L, Roussel-Chomaz, P, Drouart, A, Gillibert, A, Keeley, N, Lapoux, V, Nalpas, L, and Pollacco, E C. N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.012501.
Becheva, E, Blumenfeld, Y, Khan, E, Beaumel, D, Delaunay, F, Fallot, M, Lima, V, Scarpaci, J A, Daugas, J M, Roig, O, Sauvestre, J E, Demonchy, Ch-E, Giot, L, Roussel-Chomaz, P, Drouart, A, Gillibert, A, Keeley, N, Lapoux, V, Nalpas, L, & Pollacco, E C. N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe. United States. https://doi.org/10.1103/PhysRevLett.96.012501
Becheva, E, Blumenfeld, Y, Khan, E, Beaumel, D, Delaunay, F, Fallot, M, Lima, V, Scarpaci, J A, Daugas, J M, Roig, O, Sauvestre, J E, Demonchy, Ch-E, Giot, L, Roussel-Chomaz, P, Drouart, A, Gillibert, A, Keeley, N, Lapoux, V, Nalpas, L, and Pollacco, E C. 2006. "N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe". United States. https://doi.org/10.1103/PhysRevLett.96.012501.
@article{osti_20775008,
title = {N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe},
author = {Becheva, E and Blumenfeld, Y and Khan, E and Beaumel, D and Delaunay, F and Fallot, M and Lima, V and Scarpaci, J A and Daugas, J M and Roig, O and Sauvestre, J E and Demonchy, Ch-E and Giot, L and Roussel-Chomaz, P and Drouart, A and Gillibert, A and Keeley, N and Lapoux, V and Nalpas, L and Pollacco, E C},
abstractNote = {To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2{sub 1}{sup +} inelastic scattering angular distributions for the neutron-rich nucleus {sup 22}O were measured using the MUr a STrip detector array at the Grand Accelerateur National d'Ions Lourds facility. A deformation parameter {beta}{sub p,p{sup '}}=0.26{+-}0.04 is obtained for the 2{sub 1}{sup +} state, much lower than in {sup 20}O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. The ratio of neutron to proton contributions to the 2{sub 1}{sup +} state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip line.},
doi = {10.1103/PhysRevLett.96.012501},
url = {https://www.osti.gov/biblio/20775008}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 1,
volume = 96,
place = {United States},
year = {Fri Jan 13 00:00:00 EST 2006},
month = {Fri Jan 13 00:00:00 EST 2006}
}