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<p>Multinucleon transfer (MNT) reactions offer a promising pathway for the production and study of neutron-rich nuclei in the heavy and superheavy element regions. The majority of undiscovered nuclei in these regions are expected to exhibit extremely short half-lives and production cross-sections well below the microbarn range, thus demanding highly efficient separation and detection techniques to enable their identification. In this context, to assess the applicability of the Separator for Heavy ELement Spectroscopy SHELS for MNT studies, several collision systems involving Pb and Bi targets were investigated. The results demonstrate that asymmetric reaction systems can be successfully employed with SHELS to study the above-target MNT products. Approximately 40 directly populated <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\alpha\)</EquationSource> </InlineEquation>-decaying nuclei were identified, involving up to an eight proton transfer from projectile to target, with cross-sections down to the nanobarn level and half-lives as short as a few microseconds. These findings highlight the potential of SHELS, especially when operated with optimized settings and high intensity beams, for future investigations. The ongoing construction of the dedicated wide acceptance kinematic separator STAR, along with the modernization of the U400 cyclotron to deliver higher intensity beams, is expected to significantly enhance MNT based research and facilitate access to previously unreachable nuclei.</p>

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In-flight Separation of Heavy Multinucleon Transfer Products using the kinematic separator SHELS

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • H. M. Devaraja,
  • A. I. Svirikhin,
  • S. Heinz,
  • A. V. Isaev,
  • I. N. Izosimov,
  • A. A. Kuznetsova,
  • O. N. Malyshev,
  • Yu.A. Popov,
  • B. Sailaubekov,
  • M. S. Tezekbayeva,
  • U. A. Abitayeva,
  • E. K. Almanbetova,
  • A. K. Azhibekov,
  • K. Mendibayev

摘要

Multinucleon transfer (MNT) reactions offer a promising pathway for the production and study of neutron-rich nuclei in the heavy and superheavy element regions. The majority of undiscovered nuclei in these regions are expected to exhibit extremely short half-lives and production cross-sections well below the microbarn range, thus demanding highly efficient separation and detection techniques to enable their identification. In this context, to assess the applicability of the Separator for Heavy ELement Spectroscopy SHELS for MNT studies, several collision systems involving Pb and Bi targets were investigated. The results demonstrate that asymmetric reaction systems can be successfully employed with SHELS to study the above-target MNT products. Approximately 40 directly populated \(\alpha\) -decaying nuclei were identified, involving up to an eight proton transfer from projectile to target, with cross-sections down to the nanobarn level and half-lives as short as a few microseconds. These findings highlight the potential of SHELS, especially when operated with optimized settings and high intensity beams, for future investigations. The ongoing construction of the dedicated wide acceptance kinematic separator STAR, along with the modernization of the U400 cyclotron to deliver higher intensity beams, is expected to significantly enhance MNT based research and facilitate access to previously unreachable nuclei.