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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) (and others)
Publication Date:
OSTI Identifier:
20775008
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; 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)
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. 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., and Pollacco, E. C. Fri . "N=14 Shell Closure in {sup 22}O Viewed through a Neutron Sensitive Probe". United States. doi: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},
journal = {Physical Review Letters},
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}
}