https://doi.org/10.1140/epja/s10050-022-00907-3
Regular Article - Theoretical Physics
Collaboration with Dr. Efrem Sh. Soukhovitsukii: our fortuitous experiences on optical model analysis, his contribution to nuclear data activities of Japan and a posthumous study on light-nuclei
1
Nuclear Data Center, Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai-mura, 319-1195, Naka-gun, Ibaraki, Japan
2
Sector of Fukushima Research and Development, Japan Atomic Energy Agency (JAEA), 790-1 Moto-oka aza Ohtsuka, Tomioka-machi, 979-1151, Futaba-gun, Fukushima, Japan
3
Institute of Innovative Research (IIR), Tokyo Institute of Technology (Tokyo Tech.), N1-9, 2-12-1 Ookayama, 152-8550, Meguro, Tokyo, Japan
Received:
14
October
2022
Accepted:
9
December
2022
Published online:
10
January
2023
Optical model or coupled-channels calculation serves as an entrance to sophisticated calculation of nuclear data. It gives the optical quantities such as total, shape elastic scattering, absorption cross sections, direct inelastic scattering cross sections, angular distributions of elastic and inelastic scattering, and transmission coefficients for subsequent statistical model calculations. Traditionally, coupling of the elastic scattering channel to excited states of the target nucleus was ignored or treated with a simplified model such as rigid rotor or harmonic oscillator. It was a great contribution of Dr. Efrem Sh. Soukhovitsukii who has developed an excellent computation scheme which takes account of the low-lying collective nuclear structure in terms of the soft-rotator + vibrational model, and integrated it into the coupled-channels calculation. This methodology was realized as 2 computer codes, SHEMMAN and OPTMAN. In Japan, we had a fortuitous experience with him to employ this methodology in nuclear data evaluation, which started as a nuclear physics work to analyze neutron-scattering cross section of 
C which were published as a series of 3 papers in Nuclear Physics A journal. After recognizing the usefulness of this methodology, it was applied to evaluation of nuclear data gradually and extensively, which resulted in obtaining awards of Atomic Energy Society of Japan (AESJ) by one of the authors (SK). This paper describes our collaborative works and recent findings on light-nuclei based on what he had developed.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
