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KISS-1.5: Upgrade of KEK Isotope Separation System.

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Bibliographic Details
Title: KISS-1.5: Upgrade of KEK Isotope Separation System.
Authors: Watanabe, Yutaka1 (AUTHOR), Hirayama, Yoshikazu1 (AUTHOR)
Source: Nuclear Physics News. Jan-Mar2026, Vol. 36 Issue 1, p12-15. 4p.
Subject Terms: *Isotope separation, *Isotopes, *Nuclear astrophysics, *Atomic nucleus, *Nucleon-nucleon interactions, *Neutron capture
Abstract: The article focuses on the development and scientific contributions of the KEK Isotope Separation System (KISS) and its upgraded version, KISS-1.5, at the RIKEN Radioactive Isotope Beam Factory (RIBF) for studying neutron-rich nuclei critical to the rapid neutron-capture process (r-process) in nucleosynthesis. KISS employs multinucleon transfer reactions combined with gas-cell thermalization and laser ionization to produce and analyze refractory nuclei near neutron magic number 126, providing key experimental data on masses and decay properties previously inaccessible. The KISS-1.5 upgrade introduces a helium-based gas cell, enhanced ion extraction, and a variable mass-range separator, enabling systematic measurements of over 80 neutron-rich actinide isotopes, which are essential for refining nuclear models and improving astrophysical understanding of heavy-element formation. These advancements address significant gaps in experimental data, particularly in the actinide region, and are expected to substantially reduce uncertainties in r-process modeling. [Extracted from the article]
Database: Energy & Power Source
Description
Abstract:The article focuses on the development and scientific contributions of the KEK Isotope Separation System (KISS) and its upgraded version, KISS-1.5, at the RIKEN Radioactive Isotope Beam Factory (RIBF) for studying neutron-rich nuclei critical to the rapid neutron-capture process (r-process) in nucleosynthesis. KISS employs multinucleon transfer reactions combined with gas-cell thermalization and laser ionization to produce and analyze refractory nuclei near neutron magic number 126, providing key experimental data on masses and decay properties previously inaccessible. The KISS-1.5 upgrade introduces a helium-based gas cell, enhanced ion extraction, and a variable mass-range separator, enabling systematic measurements of over 80 neutron-rich actinide isotopes, which are essential for refining nuclear models and improving astrophysical understanding of heavy-element formation. These advancements address significant gaps in experimental data, particularly in the actinide region, and are expected to substantially reduce uncertainties in r-process modeling. [Extracted from the article]
ISSN:10619127
DOI:10.1080/10619127.2026.2614252