Eur. Phys. J. A (2012) 48: 95
https://doi.org/10.1140/epja/i2012-12095-4

Regular Article - Experimental Physics

Gamma-ray measurements in the one-neutron knockout of ¹⁷C, ¹⁹N, ²¹O and ²⁵F

¹ Departmento de Física de Partículas, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
² GSI Helmholtzzentrum für Schwerionenforschung, D-64291, Darmstadt, Germany
³ Instituto de Estructura de la Materia, CSIC, E-28006, Madrid, Spain
⁴ Kurchatov Institute, 123182, Moscow, Russia
⁵ Physik Department E12, Technische Universität München, D-85748, Garching, Germany
⁶ Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296, Göteborg, Sweden
⁷ PH Department, CERN, CH-1211, Geneve, Switzerland
⁸ Astronomy and Physics Department, Saint Mary’s University, B3H 3C3, Halifax, NS, Canada

^* e-mail: rodriguez@ganil.fr

Received: 16 March 2012
Revised: 15 June 2012
Accepted: 23 June 2012
Published online: 20 July 2012

Abstract

One-neutron knockout reactions in a ⁹Be target have been investigated at relativistic energies, near 700 MeV/u, for a set of sd-shell, neutron-rich nuclei. The experiment was performed in the FRS spectrometer, at GSI. γ-ray measurements were carried out by means of the MINIBALL γ-ray spectrometer and allowed the determination of partial cross-sections and branching ratios corresponding to the final states of the emerging knockout fragments. Experimental results are presented for ¹⁷C, ¹⁹N, ²¹O and ²⁵F projectiles. The role of excited states of the N − 1 fragments in the composition of the ground state of these neutron-rich projectiles is outlined in this work.