Separation energy distribution of He-4 spectral function

To clarify the mode of existence of internucleon correlation in nuclei is the basic subject of nuclear physics. As the object region of its research, the system of a small number of nucleons is desirable, which can be solved on the basis of realistic nuclear force, and the uncertainty of the wave function is little. From this viewpoint, recently the authors determined the He-4 spectral function in the form of satisfying the law of momentum sum based on the realistic wave function. As for He-4, this is the first theoretical calculation. This spectral function can be derived from one nucleon knockout reaction by assuming plane wave impulse approximation (PWIA). The cross section of A(e,e'p)B reaction under the assumption of PWIA is given. In this study, the position of a peak in the separation energy distribution of the He-4 spectral function was investigated along the discussion of Ciofi et al., and the internucleon correlation reflected there was examined. The sum rule consistent with the He-4 spectral function, and two-nucleon correlation model are described. The value forecast by the two-nucleon correlation model agreed well with the peak in the energy distribution of the He-4 spectral function. (K.I.)