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Direct measurement of the break-out 19F(p,γ)20Ne reaction in the China Jinping underground laboratory(CJPL)

Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao Zhang Li‑Yong Zhang Jian‑Jun He Richard James deBoer michael wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li Jian‑Guo Wang Long Zhang Fu‑Qiang Cao Zhi‑Cheng Zhang Xin‑Zhi Jiang Luo‑Huan Wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang Ma Er‑Tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atomic Energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out 19F(p,γ)20 Ne reaction with respect to the competing 19F(p,α)16 O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the China Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear 19F(p,γ)20 Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the 19F(p,γ)20 Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA

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利用深地加速器核反应研究恒星等离子环境近阈量子效应

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Science Bulletin 2023年第7期68卷 666-669页

作者： michael wiescher 柳卫平 Department of Physics and Astronomy University of Notre DameNotre Dame IN 46556USA School of Physics and Astronomy University of EdinburghEdinburgh EH93FDUK College of Science Southern University of Science and TechnologyShenzhen 518055China China Institute of Atomic Energy Beijing 102413China

Low energy particle accelerators,located at deep underground locations,have been developed over the last three decades,to perform nuclear reaction measurements at nearly cosmic ray free background *** are a unique tool in our desire to study and interpret the origin of the elements in our universe,from the Big Bang to present times[1].

关键词： conditions. 量子效应 elements

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2-6 First Direct Measurement of 12C(12C, n)23Mg at Stellar Energies

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IMP & HIRFL Annual Report 2015年第1期 56-58页

作者： Tang Xiaodong B. Bucher X. Fang A. Heger S. Almaraz-Calderon A. Alongi A.D. Ayangeakaa M. Beard A. Best J. Browne C. Cahillane M. Couder R.J. deBoer A. Kontos L. Lamm Y.J. Li A. Long W. Lu S. Lyons M. Notani D. Patel N. Paul M. Pignatari A. Roberts D. Robertson K. Smith E. Stech R. Talwar W.P. Tan M. wiescher S.E. Woosley Institute of Modern Physics Chinese Academy of Science Lanzhou 730000 China Institute for Structure and Nuclear Astrophysics Joint Institute for Nuclear AstrophysicsUniversity of Notre Dame Notre Dame Indiana 46556 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Monash Center for Astrophysics School of Physics and Astronomy Monash University Victoria 3800 Australia Department of Physics and Astronomy Shanghai Jiao-Tong University CNA Shanghai 200240 China School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA China Institute of Atomic Energy Beijing 102413 China Konkoly Observatory Research Centre for Astronomy and Earth Sciences Hungarian Academy of SciencesKonkoly Thege Mikl′os′ut 15-17 H-1121 Budapest Hungary Department of Physics University of Basel Basel CH-4056 Switzerland Department of Astronomy and Astrophysics University of California Santa Cruz California 95064 USA

The first stars in the early Universe were formed about 400 million years after the big bang. Verification of the existence of these stars is important for our understanding of the evolution of the Universe[1]. It has been predicted that for Population-III stellar production yields, the abundances of odd-Z elements are remarkably deficient compared to their adjacent even-Z elements[2]. Astronomers are searching for long-lived, low mass stars with the unique nucleosynthetic pattern matching the predicted yields[3].

关键词： First Direct Measurement

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