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Structure of neutron-rich oxygen isotopes

Cortina-Gil, D; Fernandez-Vazquez, J; Aumann, T; Baumann, T; Benlliure, J; Borge, M J G; Chulkov, L V; Pramanik, U D; Forssen, C and Fraile, L M, et al. (2005) In Journal of Physics G: Nuclear and Particle Physics 31(10). p.1629-1632
Abstract
One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of γ rays in coincidence with the longitudinal momentum distribution. The controversial case of 23O has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions... (More)
One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of γ rays in coincidence with the longitudinal momentum distribution. The controversial case of 23O has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of Iπ = 1/2+ for the 23O ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s1/2 neutron in 23O. (Less)
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type
Contribution to journal
publication status
published
in
Journal of Physics G: Nuclear and Particle Physics
volume
31
issue
10
pages
1629 - 1632
publisher
IOP Publishing
external identifiers
  • scopus:25444514753
ISSN
0954-3899
DOI
10.1088/0954-3899/31/10/045
language
English
LU publication?
no
id
46a8605f-3a35-4fa8-8363-5c1da378b6e2 (old id 1133250)
date added to LUP
2008-06-25 09:35:50
date last changed
2017-03-14 08:13:22
@article{46a8605f-3a35-4fa8-8363-5c1da378b6e2,
  abstract     = {One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of γ rays in coincidence with the longitudinal momentum distribution. The controversial case of 23O has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of Iπ = 1/2+ for the 23O ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s1/2 neutron in 23O.},
  author       = {Cortina-Gil, D and Fernandez-Vazquez, J and Aumann, T and Baumann, T and Benlliure, J and Borge, M J G and Chulkov, L V and Pramanik, U D and Forssen, C and Fraile, L M and Geissel, H and Gerl, J and Hammache, F and Itahashi, K and Janik, R and Jonson, B and Mandal, S and Markenroth Bloch, Karin and Meister, M and Mocko, M and Muenzenberg, G and Ohtsubo, T and Ozawa, A and Prezado, Y and Riisager, K and Scheit, H and Schneider, R and Schrieder, G and Simon, H and Sitar, B and Stolz, A and Strmen, P and Suemmerer, K and Szarka, I and Weick, H},
  issn         = {0954-3899},
  language     = {eng},
  number       = {10},
  pages        = {1629--1632},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics G: Nuclear and Particle Physics},
  title        = {Structure of neutron-rich oxygen isotopes},
  url          = {http://dx.doi.org/10.1088/0954-3899/31/10/045},
  volume       = {31},
  year         = {2005},
}