Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..203h&link_type=abstract
CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002
Physics
Scientific paper
Single-nucleon knockout reactions in inverse kinematics at energies above 50 MeV/nucleon offer a powerful spectroscopic tool for identifying single-particle structure. Partial and differential cross sections to individual final levels can be obtained by measuring the momentum of the projectile residue with a high-resolution spectrograph in coincidence with gamma rays. The shape of the longitudinal momentum spectra identifies the orbital angular momentum l, while the absolute cross sections determine single-nucleon spectroscopic factors. Examples of results with this technique are given. The method has an extremely high sensitivity, and experiments have been carried out with incident beams of less than one atom/second. An analysis of precise data from high-energy experiments suggests that the method furnishes absolute occupancies and will allow the study of short-range correlations caused by the hard core in the nucleon-nucleon interaction. For the deeply bound p-shell neutron states of 16O and 12C the occupancies are reduced by factors Rs of 0.56(3) and 0.51(3), respectively, relative to the many-body shell model with effective interactions. Data for weakly bound neutron and proton states in radioactive nuclei give Rs values much closer to unity. This aspect of the nuclear knockout method will make it an interesting tool for understanding the fundamentals of the shell model.
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