Eur. Phys. J. A (2005) 25: 343-346
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

Abstract

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.