The knockout reaction of 15 C on a 9 Be target at intermediate energies
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NUCLEI Theory
The Knockout Reaction of 15C on a 9 Be Target at Intermediate Energies∗ H. Sadeghi** , R. Fereidonnejad, and M. Ghambari Department of Physics, Faculty of Science, Arak University, Iran Received October 29, 2015; in final form, December 24, 2015
Abstract—In this work, neutron knockout reactions of 15 C on a 9 Be target at energy 103 and 250 MeV/nucleon are studied. Using the Eikonal approximation of the Glauber model, total neutron removal cross sections, the stripping and diffractive cross sections as well as 14 C longitudinal momentum distributions are determined in both 15 C ground state and exited states of the wave function. We compared the results of our calculations with the available experimental data obtained recently. The calculated cross sections of 15 C and 14 C reactions, as well as the momentum distribution are in relatively good agreement with available data. DOI: 10.1134/S1063778816030133
INTRODUCTION Direct nucleon removal reaction at intermediate energy is a unique way to probe the ground- state atomic nuclear wave functions. In the collision of a fast moving projectile, a single nucleon is removed from the projectile, for example a single-neutron halo is the ground state of the nucleus 15 C, which is identified to be a 1/2+ intruder from the sd shell, the standard picture of halo nucleus has been an inert 14 C core and 1s valence neutron [1–6]. Recent research concerning knockout cross sections, showed a systematic trend compared to theoretical calculations for shell occupancies, sudden, and Eikonal approximations for the nucleon removal reaction [7]. The experimental cross sections for the knockout of deeply-bound nucleons are much smaller than the theoretical predictions for mostly low nuclear densities [6, 8–13]. One-neutron knockout reactions have already shown an impressive ability to provide accurate spectroscopic information on the dominant nucleon single-particle structures of unstable isotopes far from the dripline [1, 3].
longitudinal momentum distributions as well as the absolute cross sections. In this work, the tendency of performing theoretical analysis of the 15 C momentum distributions in stripping and diffraction dissociation on a light target (9 Be) using the Eikonal approximation of the Glauber model have been investigated. In this way, total neutron removal cross sections, the breakup and stripping cross sections as well as 14 C longitudinal momentum distributions are determined by both 15 C ground state and exited state wave functions. The knockout reaction 9 Be(15 C, 14 C)X for the collisions at the energies 103 and 250 MeV/nucleon are conNucleon r Core
Rc
Kelley et al. measured the narrow distribution of the parallel momentum of the halo structure [14]. The narrow momentum distributions of the core fragments revealed the large spatial extension of the halo wave function. Calculations [15–17] based on the black-disk model could account for the observed ∗ **
bc
Rn R
bn
Target
x z y
The text was submitted by the authors in English. E-mail: [email protected]
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