High Resolution Study of 40Ca to Constrain Potassium Nucleosynthesis in NGC 2419

Fox, W.; Longland, R.; Marshall, C.; Chaves, F. Portillo

doi:10.1103/physrevlett.132.062701

High Resolution Study of ⁴⁰Ca to Constrain Potassium Nucleosynthesis in NGC 2419

Journal Article · Wed Feb 07 23:00:00 EST 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.132.062701· OSTI ID:2283499

^[1]; ^[2]; Marshall, C. ^[3]; ^[4]

North Carolina State University, Raleigh, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States); North Carolina State University
North Carolina State University, Raleigh, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States)
Triangle Universities Nuclear Laboratory, Durham, NC (United States); University of North Carolina, Chapel Hill, NC (United States)
North Carolina State University, Raleigh, NC (United States)

The globular cluster NGC 2419 was the first to exhibit a Mg-K anticorrelation, linked to hydrogen burning at temperatures between 80-260 MK. However, the key K-destroying reaction, ³⁹K(p,γ)⁴⁰Ca, has a large rate uncertainty in this range. We significantly constrain this rate with a high resolution ³⁹K(³He,d)⁴⁰Ca study. We resolve the $$E$$$^{c.m.}_{r}$$ = 154 keV resonance in ³⁹K+p for the first time, increasing the previous rate by up to a factor 13 and reducing its 1σ width by up to a factor of 42. As a result, reaction network calculations for NGC 2419 suggest that this could lower temperatures needed to reproduce the Mg-K anticorrelation.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0017799; FG02-97ER41033; FG02-97ER41042

OSTI ID:: 2283499

Alternate ID(s):: OSTI ID: 2474199

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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