Abstract
Inclusive one- and multi-nucleon removal cross sections have been measured for several Sn, Sb and Te isotopes just beyond the N=82 neutron shell closure. The beams were produced in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. The experimental cross sections are compared to predictions from the most recent version of the Liege intranuclear cascade model. Although the overall agreement is good, severe discrepancies are observed for the cases of one- and two-neutron removal from 134Sn and 135Sb projectiles and one-proton knockout from all measured N=84 isotones. These discrepancies, as well as the relevance of quasi-elastic reaction channels to the one-neutron removal cross sections, are discussed. In addition, the measured inclusive one-proton knockout cross section for the semi-magic 134Sn projectile is compared to eikonal direct reaction theory calculations to assess if the suppression factors to these calculated cross sections, deduced from data on reactions of lighter projectile nuclei, are also applicable to heavy nuclei.
Highlights
IntroductionIn the last twenty years, one-nucleon knockout reactions from intermediate energy radioactive ion beams on light target nuclei,
In the last twenty years, one-nucleon knockout reactions from intermediate energy radioactive ion beams on light target nuclei, such as Be or C, have proved to be a useful tool to study the shell structure of nuclei far from the valley of stability [1,2]
In this Letter, we report on the measurement of one- and multinucleon removal cross sections from a number of neutron-rich nuclei beyond the N = 82 shell closure, which have been produced with energies around 165 MeV/u at the Radioactive Isotope Beam Facility (RIBF) at RIKEN
Summary
In the last twenty years, one-nucleon knockout reactions from intermediate energy radioactive ion beams on light target nuclei,. Information concerning active shells at and near the neutron and proton Fermi surfaces in exotic nuclei, and their occupancies, is obtained from a comparison of the experimental inclusive and exclusive one-nucleon knockout cross sections to theoretical direct reaction calculations. For oneproton knockout from the semi-magic 134Sn projectile, the experimental cross section is compared to the eikonal model, direct reaction calculations, as discussed above [3,4], in which the projectile structure is taken into account through the single-nucleon overlap functions with the final states of interest and the reaction dynamics are described based on the complex nucleon- and residual nucleus-target optical potentials
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