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

Zhang, Liyong; He, Jiajia; deBoer, R. J.; Wiescher, M.; Heger, Alexander; Kahl, D.; Su, J.; Odell, Daniel; Chen, Yinji; Li, X. Y.; Wang, Jianguo; Zhang, Long; Cao, F. Q.; Zhang, Hao; Zhang, Zhicheng; Jiang, Xinzhi; Wang, Luohuan; Li, Ziming; Song, Luyang; Zhao, Hongwei; Sun, Limin; Wu, Qi; Li, Jiaqing; Cui, Baoqun; Chen, Lihua; Ma, Ruigang; Li, E. T.; Liu, Gang; Sheng, Y. D.; Li, Zhihong; Zhou, X.; Zhang, Yuhu; Xu, H. S.; Cheng, J.; Liu, W. P.

doi:10.1038/s41586-022-05230-x

Cited by 29 publications

(18 citation statements)

References 37 publications

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“…This finding resulted in a sevenfold increase in the reaction rate, causing leakage from the CNO cycle. [8] The numerical simulation with the present data achieved a satisfactory agreement regarding Ca abundance in the oldest star, which holds remarkable implications for future JWST activities.…”

supporting

confidence: 68%

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First Results from the Underground Nuclear Reaction Experiments in JUNA

Liu

2023

Chinese Phys. Lett.

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supporting

confidence: 68%

“…JUNA results of 19 F(p,𝛾) 20 Ne reaction. [8] The 25 Mg(p,𝛾) 26 Al reaction serves as the primary mechanism in the production of 26 Al in the galaxy, and its cross sections are dominated by the capture process of the isolated resonances in 26 Al. The temperature range of astrophysical interest is 𝑇 = 0.02-2 GK.…”

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confidence: 99%

First Results from the Underground Nuclear Reaction Experiments in JUNA

Liu

2023

Chinese Phys. Lett.

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“…BGO was chosen for its large average atomic number and density, which allows for the high γ-ray detection efficiency in a relatively compact setup, crucial for measurements requiring massive shielding. Additionally, two TAS detectors have taken up operation recently in other deep-underground laboratories: a new BGO-based detector has recently been commissioned and used for first measurements at JUNA [10,11], and the HECTOR detector made of NaI(Tl) was transported underground for measurements at CASPAR [3,12,13].…”

Section: Total Absorption Spectroscopy With a Bgo Detector At Lunamentioning

confidence: 99%

Advances in radiative capture studies at LUNA with a segmented BGO detector

Skowronski

Gesuè

Boeltzig

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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Studies of charged-particle reactions for low-energy nuclear astrophysics require high sensitivity, which can be achieved by means of detection setups with high efficiency and low backgrounds, to obtain precise measurements in the energy region of interest for stellar scenarios. High-efficiency total absorption spectroscopy is an established and powerful tool for studying radiative capture reactions, particularly if combined with the cosmic background reduction by several orders of magnitude obtained at the Laboratory for Underground Nuclear Astrophysics (LUNA). We present recent improvements in the detection setup with the Bismuth Germanium Oxide (BGO) detector at LUNA, aiming to reduce high-energy backgrounds and to increase the summing detection efficiency. The new design results in enhanced sensitivity of the BGO setup, as we demonstrate and discuss in the context of the first direct measurement of the 65 keV resonance (Ex = 5672 keV) of the 17O(p,gamma)18F reaction. Moreover, we show two applications of the BGO detector, which exploit its segmentation. In case of complex gamma-ray cascades, e.g. the de-excitation of Ex = 5672 keV in 18F, the BGO segmentation allows to identify and suppress the beam-induced background signals that mimic the sum peak of interest. We demonstrate another new application for such a detector in form of in-site activation measurements of a reaction with beta+ unstable product nuclei, e.g., the 14N(p,gamma)15O reaction.

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“…The 19 F(p,α) 16 O reaction began to acquire importance in the '30s, when John Cockroft and Ernest Sinton Walton [1] started to study the emission of energetic α particles as the effect of transmutations induced in fluorine targets by an impinging proton beam; other pioneering studies on this subject are described, e.g. in [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

New measurements of the ¹⁹F(p, α ₀)¹⁶O and ¹⁹F(p, α _π)¹⁶O* reaction cross sections close to the Coulomb barrier

Redigolo,

Lombardo,

Dell’Aquila

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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New absolute cross section measurements of the 19F(p, α 0)16O and 19F(p, α π )16O* reactions at energies close to the Coulomb barrier are reported. The availability of high-resolution and low-noise energy spectra obtained in the experiment allowed to resolve the 6.05–6.13 MeV doublet in 16O. In particular, the α π channel cross section was measured in the poorly-known 1.3 MeV bombarding energy region, and the α 0 channel was investigated in the 1.6 MeV region, where a strong discrepancy between previous data-sets is present. A comprehensive R-matrix fit, including the new data, was performed and the structure of the states ranging in the 14–15 MeV region is discussed.

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

Cited by 29 publications

References 37 publications

First Results from the Underground Nuclear Reaction Experiments in JUNA

First Results from the Underground Nuclear Reaction Experiments in JUNA

Advances in radiative capture studies at LUNA with a segmented BGO detector

New measurements of the ¹⁹F(p, α ₀)¹⁶O and ¹⁹F(p, α _π)¹⁶O* reaction cross sections close to the Coulomb barrier

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

Cited by 29 publications

References 37 publications

First Results from the Underground Nuclear Reaction Experiments in JUNA

First Results from the Underground Nuclear Reaction Experiments in JUNA

Advances in radiative capture studies at LUNA with a segmented BGO detector

New measurements of the 19F(p, α 0)16O and 19F(p, α π )16O* reaction cross sections close to the Coulomb barrier

Contact Info

Product

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New measurements of the ¹⁹F(p, α ₀)¹⁶O and ¹⁹F(p, α _π)¹⁶O* reaction cross sections close to the Coulomb barrier