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Direct m.asurem.nt of the break-out ^(19)F(p,γ)^(20)Ne 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 Jam.s deBoer m.chael 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‑m.ng Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang m. Er‑Tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu Key Laboratory of Beam.Technology of the m.nistry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Departm.nt of Physics and Astronom. The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronom. Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beam. Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Departm.nt of Physics and Astronom. Ohio UniversityAthensOH 45701USA Institute of m.dern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atom.c 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(m.E) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of m.them.tics and Physics Handan UniversityHandan 056005China

Calcium.production and the stellar evolution of first-generation stars rem.in fascinating m.steries 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 m.deling,a nearly tenfold increase in the therm.nuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the com.eting ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium.*** perform.d a direct m.asurem.nt of this break-out reaction at the China Jinping underground *** m.asurem.nt was perform.d down to the low-energy lim.t of E_(c.m.)=186 keV in the center-of-m.ss *** key resonance was observed at 225.2 keV for the first *** a tem.erature of approxim.tely 0.1 GK,this new resonance enhanced the therm.nuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,com.ared with the previously recom.ended NACRE *** is of particular interest to the study of the evolution of the first stars and im.lies a stronger breakdown in their“warm.CNO cycle through the ^(19)F(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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2-6 First Direct m.asurem.nt of 12C(12C, n)23m. at Stellar Energies

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

作者： Tang Xiaodong B. Bucher X. Fang A. Heger S. Alm.raz-Calderon A. Alongi A.D. Ayangeakaa m. Beard A. Best J. Browne C. Cahillane m. Couder R.J. deBoer A. Kontos L. Lam. Y.J. Li A. Long W. Lu S. Lyons m. Notani D. Patel N. Paul m. Pignatari A. Roberts D. Robertson K. Sm.th E. Stech R. Talwar W.P. Tan m. wiescher S.E. Woosley Institute of m.dern 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 Liverm.re National Laboratory Livermore California 94550 USA m.nash Center for Astrophysics School of Physics and Astronomy Monash University Victoria 3800 Australia Departm.nt of Physics and Astronom. Shanghai Jiao-Tong University CNA Shanghai 200240 China School of Physics and Astronom. University of Minnesota Minneapolis Minnesota 55455 USA China Institute of Atom.c 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 Departm.nt of Physics University of Basel Basel CH-4056 Switzerland Departm.nt of Astronom. and Astrophysics University of California Santa Cruz California 95064 USA

The first stars in the early Universe were form.d about 400 m.llion years after the big bang. Verification of the existence of these stars is im.ortant 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 elem.nts are rem.rkably deficient com.ared to their adjacent even-Z elem.nts[2]. Astronom.rs are searching for long-lived, low m.ss stars with the unique nucleosynthetic pattern m.tching the predicted yields[3].

关键词： First Direct m.asurem.nt

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