https://doi.org/10.1140/epjad/i2005-06-149-2
ENAM 2004
One-neutron knockout of 23O
1
Universidad de Santiago de Compostela, E-15706, Santiago de Compostela, Spain
2
Gesellschaft für Schwerionenforschung (GSI), D-64291, Darmstadt, Germany
3
NSCL, Michigan State University, MI-48824, East Lansing, USA
4
Instituto de Estructura de la Materia, CSIC, E-28006, Madrid, Spain
5
Kurchatov Institute, RU-123182, Moscow, Russia
6
Avd. för Experimentell Fysik, Chalmers Tekniska Högskola och Göteborgs Universitet, SE-412 96, Göteborg, Sweden
7
Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113, Tokyo, Japan
8
Faculty of Mathematics and Physics, Comenius University, 84215, Bratislava, Slovakia
9
RIKEN, 2-1 Hirosawa Wako, 3051-01, Saitama, Japan
10
Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000, Aarhus C, Denmark
11
Max-Planck Institut für Kernphysik, D-69117, Heidelberg, Germany
12
Physik-Deptartment E12, Technische Universität, München, D-85748, Garching, Germany
13
Institut für Kernphysik, Technische Universität, D-64289, Darmstadt, Germany
* e-mail: d.cortina@usc.es
Received:
14
March
2005
Accepted:
19
April
2005
Published online:
14
July
2005
Breakup reactions were used to study the ground-state configuration of the neutron-rich isotope 23O. The 22O fragments produced in one-nucleon removal from 23O at 938 MeV/nucleon in a carbon target were detected in coincidence with de-exciting γ rays, allowing to discern between 22O ground-state and excited-states contributions. From the comparison of exclusive experimental momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated in an Eikonal model for the knockout process, and spin and parity assignment of I π = 1/2+ was deduced for the 23O ground state. This result solved the existent experimental discrepancy.
PACS: 25.60.Gc Breakup and momentum distributions – / 25.60.Dz Interaction and reaction cross-sections – / 27.20.+n 6 ⩽ A ⩽ 19 –
© Società Italiana di Fisica and Springer-Verlag, 2005