Knockout from Ar-46: l+3 neutron removal and deviations from eikonal theory

May, 2005
Published in:
  • Phys.Rev.C 71 (2005) 051301

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Abstract: (APS)
The Be9(Ar46,Ar45+γ)X one-neutron removal reaction has been studied in inverse kinematics at 70 MeV/nucleon. Coincidences with γ rays served to disentangle knockout events leading to the Ar45 ground state. The measured partial cross section corresponds to a spectroscopic factor of 4.9(7). The residue momentum distribution is compared with new calculations based on eikonal theory and represents the first case of an ℓ=3 neutron removal, as is expected for populating a 0f7/2 hole in the N=28 projectile. However, the measured Ar45 momentum distribution has a marked low-momentum tail suggestive of dissipative effects whereas the eikonal model predictions are symmetric. The angular distribution of the residues confirms that there is a deviation from the model.
  • 21.10.Jx
  • 27.30.+t
  • 24.50.+g