The Upgraded Summing NaI(Tl) (SuN++) Absorption Spectrometer

Authors

• E. K. Ronning, Facility for Rare Isotope Beams
• S. Uthayakumaar, Facility for Rare Isotope Beams
• A. Spyrou, Facility for Rare Isotope Beams
• A. L. Richard, Facility for Rare Isotope Beams
• S. N. Liddick, Facility for Rare Isotope Beams
• A. Tsantiri, Facility for Rare Isotope Beams
• R. Ringle, Facility for Rare Isotope Beams
• H. Arora, Central Michigan University
• H. C. Berg, Facility for Rare Isotope Beams
• J. M. Berkman, Facility for Rare Isotope Beams
• D. L. Bleuel, Lawrence Livermore National Laboratory
• K. Bosmpotinis, Facility for Rare Isotope Beams
• S. E. Campbell, Facility for Rare Isotope Beams
• X. Chen, Facility for Rare Isotope Beams
• B. P. Crider, Mississippi State University
• R. J. Coleman, University of Guelph
• P. A. DeYoung, Hope CollegeFollow
• A. A. Doetsch, Facility for Rare Isotope Beams
• H. Erington, Facility for Rare Isotope Beams
• T. Gaballah, Facility for Rare Isotope Beams
• N. Gamage, Facility for Rare Isotope Beams
• E. C. Good, Pacific Northwest National Laboratory

Document Type

Article

Publication Date

2-1-2026

Publication Source

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

Volume Number

1082

ISSN

01689002

Article Number

170930

Abstract

Simulations of astrophysical processes require a plethora of nuclear physics input. In particular, models of neutron-capture nucleosynthesis like the s, i, and r processes require β-decay information and experimentally constrained neutron-capture reaction rates. Past experiments with the 4π Summing NaI(Tl) (SuN) total absorption spectrometer have provided these physics quantities. Here, we outline an upgrade of SuN to SuN++, where 20 new segments (12 NaI(Tl) and 8 CeBr3) have been integrated into the pre-existing SuN total absorption spectrometer to provide increased energy and time resolution in β-decay experiments. The details of the newly upgraded SuN++ total absorption spectrometer are discussed with results from the commissioning experiment at the Facility for Rare Isotope Beams (FRIB) utilizing a ⁷⁰Cu beam.

Keywords

CeBr3, NaI(Tl), Total absorption spectroscopy, β-decay

Recommended Citation

Published in: Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, Volume 1082, February 1, 2026.