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An impact of Jacques Raynal on nuclear data evaluation

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Abstract

Jacques Raynal seminal contributions to the optical model development and numerical implementation of the solution of coupled-channel equations have been key to generate nuclear data for applications in the last three decades. We recall some of the interactions we had with Jacques from late nineties up until his death. His ECIS code was for a long time, since his collaboration with Peter Moldauer in early eighties, the only optical model and compound decay code where Engelbrecht–Weidenmüller transformation was implemented to consider the impact of strongly coupled channels with large direct inelastic cross sections on the decay of the compound channel. Such physical effect, which was neglected for a long time, proved very important to describe the observed enhancement (Relative to the bare Hauser–Feschbach calculation) of the inelastic scattering cross section on \(^{238}\)U nucleus, which is a major fuel component in nuclear power reactors. Jacques also proposed an unique and very clever method to calculate dispersive integrals analytically in 1996. His excellent mathematical background and programming skills set a very high bar for future generations. This contribution represents a small homage to our dear colleague and friend.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data sharing not applicable to this article as no datasets were generated or analysed during the current study.]

Notes

  1. ECIS versions till ECIS94 are briefly described in https://ribf.riken.jp/~gibelin/ec94/node4.html.

  2. Raynal made special efforts to include Moldauer’s developments [5,6,7] into his ECIS code following Moldauer untimely death during the ICTP Trieste workshop on 27 January 1984.

  3. Today, we routinely couple more than 20 levels on \(7/2^-\) ground state of the \(^{235}\)U target and get the results in less than one hour on a laptop computer. This was unthinkable 30 years ago.

  4. Ou simplement “ les Mines,” et plus récemment de MINES ParisTech.

  5. Jacques and Claudette travel almost everywhere together.

  6. See more information on EMPIRE collaboration at https://nds.iaea.org/empire/.

  7. See the RIPL optical model interface “Code for Retrieving Optical Model Potentials” available online at https://nds.iaea.org/RIPL-3/.

  8. By an extremely sad coincidence, our much appreciated collaborator Dr. Efrem Sh. Soukhovitskii also passed away very recently.

  9. A very sensitive experimental quantity to small differences in the calculated optical model cross sections of neighbor nuclei.

  10. Adopted for the ENDF/B-VIII.0 library [58].

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Authors and Affiliations

  1. NAPC–Nuclear Data Section, International Atomic Energy Agency, 1400, Vienna, Austria

    R. Capote

  2. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Ap.1065, 41080, Sevilla, Spain

    J. M. Quesada

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Capote, R., Quesada, J.M. An impact of Jacques Raynal on nuclear data evaluation. Eur. Phys. J. A 57, 210 (2021). https://doi.org/10.1140/epja/s10050-021-00486-9

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