Measurement of 19F(p, γ)20Ne reaction suggests CNO breakout in first stars

Article Multidisciplinary Sciences

First result from the Jinping Underground Nuclear Astrophysics experiment JUNA: precise measurement of the 92 keV 25Mg(p, y)26Al resonance

Jun Su et al.

Summary: The study successfully measured the 25Mg(p, y)26Al resonance in China, showing new reaction rates that are 2.4 times larger than previously adopted values, indicating higher production rates of 26gAl and cosmic gamma rays.

SCIENCE BULLETIN (2022)

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News Item Multidisciplinary Sciences

ONE TELESCOPE TO RULE THEM ALL

Alexandra Witze

Summary: The James Webb Space Telescope is designed to explore the early Universe and will provide valuable insights into the origins and development of the cosmos.

NATURE (2021)

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Article Physics, Multidisciplinary

Direct Measurement of the Astrophysical 19F(p,αγ)16O Reaction in the Deepest Operational Underground Laboratory

L. Y. Zhang et al.

Summary: Fluorine is considered one of the most interesting elements in nuclear astrophysics, and the direct measurements of the F-19(p, alpha gamma)O-16 reaction channel have provided new insights into the reaction rate at relevant astrophysical energies. The experiment conducted at the Jinping Underground Nuclear Astrophysics facility revealed deviations from previous theoretical predictions in low-energy S factors and significantly reduced uncertainties in the data. This study highlights the importance of experimental data in refining our understanding of nuclear astrophysical processes.

PHYSICAL REVIEW LETTERS (2021)

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Article Instruments & Instrumentation

Strong and durable fluorine-implanted targets developed for deep underground nuclear astrophysical experiments

Liyong Zhang et al.

Summary: The study found that traditional fluorine targets are prone to material loss in high-current experiments, while targets prepared by implantation method are more stable. The optimal target scheme is to first implant F ions into pure Fe backing, then sputter a Cr layer to further prevent material loss.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS (2021)

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Article Physics, Nuclear

19F(p, γ)20Ne and 19F(p, αγ)16O reaction rates and their effect on calcium production in Population III stars from hot CNO breakout

R. J. DeBoer et al.

Summary: First generation stars evolve differently due to their initial primordial abundance composition, lacking carbon, oxygen, and nitrogen. The enhanced abundance of calcium in the most metal-poor stars could potentially be a result of high temperature H-burning in the first massive stars, but the rate uncertainty for this enrichment is considerable. Additional experimental measurements are necessary to determine the cause of calcium enrichment in metal-poor stars.

PHYSICAL REVIEW C (2021)

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Article Physics, Nuclear

New measurement of the Ec.m.=323 keV resonance in the 19F(p, γ) 20Ne reaction

M. Williams et al.

Summary: This study presents the first inverse kinematics study of the F-19(p, gamma) Ne-20 reaction, measuring the strength of the 323-keV resonance and observing a factor of two difference compared to previous studies. A new thermonuclear reaction rate is calculated and compared with existing literature, highlighting the importance of direct to ground state transitions in the reaction dynamics.

PHYSICAL REVIEW C (2021)

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Article Astronomy & Astrophysics