Many-Body and Single-Body Low-Energy Elastic Positron Scattering by Beryllium Atoms: From Ab Initio to Semiempirical Approaches

Round 1

Reviewer 1 Report

The paper presents comparison of low-energy elastic cross sections of positron-Beryllium scattering between the ab initio Schwinger multichannel method and the semiempirical single-body Hamiltonian with a polarization potential. The phase shifts are compared with different dipole polarizabilities. The resulted elastic cross sections are presented and compared with the values of the preceding studies. The (e+, Be) bound state is confirmed and no Ramsauer minimum or shape resonance are present in the cross sections, which corroborate the results of the previous studies.

 

The objectives, results, and findings are well described. On the other hand, the structure of section 2 can be improved.

 

pages 3-7

Section 2 describes the ab initio/semiempirical methods and comparison of the phase consecutively, and it seems a bit busy for following the assumption and methodology of each scheme. I suggest using subsections and dividing the ab initio part and the semiempirical part explicitly.

 

Figure 2 in page 7:

Please provide definition of \delta_0, \delta_1, and \delta_2 in the figure caption as well as body of the manuscript. In addition, please describe the polarizability/scattering length in the caption, rather than using “the first line of Table 2”

 

Author Response

The answer is provided in the attached pdf file. 

Author Response File: Author Response.pdf

Reviewer 2 Report

1) maybe the abscissa and ordinate axes in Figure 5 (upper panel) are better done on a logarithmic scale and compared with the classical expression for the capture section into a spiral orbit around the attracting center (inversely the root dependence on the collision energy)

2) ) maybe the ordinate axis in Figure 5 (bottom panel) is better done in a logarithmic scale

Author Response

The answer is attached in the pdf file. 

Author Response File: Author Response.pdf