4 results match your criteria: "Research Centre for Astronomy and Earth Sciences (CSFK)[Affiliation]"
First Direct Measurement of the 64.5 keV Resonance Strength in the ^{17}O(p,γ)^{18}F Reaction.
Phys Rev Lett
August 2024
Università degli Studi di Genova, 16146 Genova, Italy.
Article Synopsis
- The CNO cycle is a key nuclear energy process in stars, particularly significant in hydrostatic hydrogen burning at temperatures between 20 to 80 MK.
- This study reports the first direct measurements of the resonance strength of the ^{17}O(p,γ)^{18}F reaction, revealing a strength about twice as high as previously documented.
- The findings enhance our comprehension of oxygen isotopic ratios observed in red giant stars and in O-rich presolar grains, confirming consistency with earlier results from different reaction channels.
Proton-Capture Rates on Carbon Isotopes and Their Impact on the Astrophysical ^{12}C/^{13}C Ratio.
Phys Rev Lett
October 2023
Università degli Studi di Genova, 16146 Genova, Italy.
Article Synopsis
- The ^{12}C/^{13}C ratio is crucial for understanding how hydrogen burning occurs in stars and is influenced by specific nuclear reactions.
- Research conducted at LUNA in Italy has measured these reactions at previously unexplored low energy levels, contributing to our understanding of nucleosynthesis in giant stars.
- The team's findings indicate that their reaction rate results are significantly lower than most existing literature, providing a new, more precise estimate for the ^{12}C/^{13}C ratio during hydrogen burning.
Measurement of the ^{18}O(α, γ)^{22}Ne Reaction Rate at JUNA and Its Impact on Probing the Origin of SiC Grains.
Phys Rev Lett
March 2023
China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China.
The ^{18}O(α,γ)^{22}Ne reaction is critical for AGB star nucleosynthesis due to its connection to the abundances of several key isotopes, such as ^{21}Ne and ^{22}Ne. However, the ambiguous resonance energy and spin-parity of the dominant 470 keV resonance leads to substantial uncertainty in the ^{18}O(α,γ)^{22}Ne reaction rate for the temperature of interest. We have measured the resonance energies and strengths of the low-energy resonances in ^{18}O(α,γ)^{22}Ne at the Jinping Underground Nuclear Astrophysics experimental facility (JUNA) with improved precision.
View Article and Find Full Text PDFDeep Underground Laboratory Measurement of ^{13}C(α,n)^{16}O in the Gamow Windows of the s and i Processes.
Phys Rev Lett
September 2022
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences (CSFK), Eötvös Loránd Research Network (ELKH), Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary.
Article Synopsis
- The ^{13}C(α,n)^{16}O reaction is crucial for generating neutrons in certain stellar processes but has been difficult to study directly due to low reaction rates and interference from cosmic rays.
- The authors conducted the first thorough direct measurement of this reaction at underground labs, covering a significant energy range (0.24 to 1.9 MeV) to improve the accuracy of previous experimental data.
- This study reduced the uncertainty in reaction rates from 60% to 15%, providing more reliable information for understanding slow-neutron-capture processes in stars and offering the first direct alpha strength measurement for near-threshold states.