Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session L09: Nuclear Astrophysics V
9:00 AM–12:00 PM,
Friday, December 1, 2023
Hilton Waikoloa Village
Room: Kohala 2
Chair: Stephanie Lyons, Pacific Northwest National Laboratory
Abstract: L09.00011 : Constraining the Astrophysical γ Process: Cross Section Measurements of (p,γ) Reactions in Inverse Kinematics
11:30 AM–11:45 AM
Presenter:
Artemis Tsantiri
(Michigan State University)
Authors:
Artemis Tsantiri
(Michigan State University)
Artemis Spyrou
(Michigan State University)
Alicia R Kyle
(University of Tennessee, Knoxville)
Hannah Berg
(Michigan State University)
Konstantinos Bosmpotinis
(Michigan State University)
Paul A Deyoung
(Hope College)
Erin C Good
(FRIB)
Caley Harris
(Michigan State University)
Sean N Liddick
(Michigan State University)
Stephanie M Lyons
(Pacific Northwest National Laboratory)
Gerard J Owens-Fryar
(Michigan State University)
Jorge Pereira
(Michigan State University)
Andrea Richard
(Lawrence Livermore National Laboratory)
Amal Sebastian
(Michigan State University)
Mallory K Smith
(Facility for Rare Isotope Beams)
Sivahami Uthayakumaar
(Facility for Rare Isotope Beams)
Remco G Zegers
(Michigan State University)
Networks of nuclear reactions are simulated under appropriate astrophysical conditions in order to reproduce the p nuclei abundances that are observed in nature. However, as experimental cross sections of γ process reactions are almost entirely unknown, the related reaction rates are based entirely on Hauser-Feshbach (HF) theoretical calculations and therefore carry large uncertainties. For this purpose the accurate cross section measurement of photodisintegration reactions within the astrophysically relevant Gamow window is of crucial importance.
In this talk two such experiments will be presented, namely the total cross section measurement of the 82Kr(p,γ)83Rb and 73As(p,γ)74Se reactions. Specifically the latter reaction is found to be of significant importance to the final abundance of the lightest p-nucleus, 74Se, as the inverse reaction is its main destruction mechanism. The experiments took place at Michigan State University using the ReA facility. The 82Kr and 73As beams were directed onto a hydrogen gas cell located in the center of the Summing NaI(Tl) (SuN) detector and the obtained spectra were analyzed using the γ-summing technique. In addition to the total cross section measurement of the particular reaction, statistical properties of the compound nucleus (nuclear level density and γ-ray strength function) can also be extracted. Results from the two experiments along with their comparison to standard statistical model calculations using the NON-SMOKER and TALYS codes will be presented.
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