Jun 13 – 17, 2022
Berkeley, CA
US/Pacific timezone

β-decay strength distributions of neutron-rich isotopes for r-process nucleosynthesis

Jun 14, 2022, 3:50 PM
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary


Stephanie Lyons (Pacific Northwest National Laboratory)


Approximately half of the elements heavier than iron are thought to be produced in the r process. Recent insights into the astrophysical site of this critical process highlight the need for experimental data on short-lived neutron-rich nuclei. R-process nucleosynthesis sensitivity studies show that the final abundance distributions of r-process nuclei are greatly impacted by β-decay properties, such as half-lives and β-delayed neutron-emission probabilities [1]. To inform global models used to calculate these properties, the β-decay strengths for a series of neutron-rich Co isotopes have been measured using the technique of total absorption spectroscopy with the Summing NaI (SuN) detector. The resultant β-decay intensities and deduced Gamow-Teller strengths are compared to QRPA calculations, which are typically used in r-process models. Results from several different experiments will be presented along with determined trends which may inform future theoretical calculations.

This work was supported by the Laboratory Directed Research and Development Program at Pacific Northwest National Laboratory operated by Battelle for the US Department of Energy.

[1] M. R. Mumpower, R. Surman, G.C. McLaughlin, A. Aprahamian. Progress in Particle and Nuclear Physics 86 (2016), 86-126.

Primary authors

Stephanie Lyons (Pacific Northwest National Laboratory) Artemis Spyrou (Michigan State University) Sean Liddick (FRIB/MSU) Rebecca Lewis (National Superconducting Cyclotron Laboratory, Michigan State University) Mejdi Mogannam (Michigan State University (MSU)) Hannah Berg (MSU/FRIB) Darren Bleuel (LLNL) Dr B. Alex Brown (Department of Physics and Astronomy, Michigan State University) Katherine Childers (Texas A&M University) Prof. Benjamin Crider (Mississippi State University) Dr Alexander Dombos (University of Notre Dame) J Engel (University of North Carolina) Dr Caley Harris (Michigan State University) Prof. Magne Guttormsen (University of Oslo) Prof. Ann-Cecilie Larsen (University of Oslo) Matthew Mumpower (Los Alamos National Laboratory) Evan Ney (University of North Carolina) Dr Alicia Palmisano (University of Tennessee, Knoxville) Andrea Richard (Lawrence Livermore National Laboratory, Facility for Rare Isotope Beams) Dr Debra Richman (Facility for Rare Isotope Beams) Dr N. Scielzo (LLNL) Dr Anna Simon-Robertson (University of Notre Dame) M. Smith (NSCL/FRIB/MSU) Dr Adriana Sweet (Lawrence Livermore National Laboratory) R. Zegers (NSCL/FRIB/MSU)

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