首页|First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos

First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos

来源：

Arxiv

英文摘要

Reactions on the proton-rich nuclides drive the nucleosynthesis in Core-Collapse Supernovae (CCSNe) and in X-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the interstellar medium and hence are a potential inventory of p-nuclei, whereas in XRBs nucleosynthesis powers the light curves. In both astrophysical sites the Ni-Cu cycle, which features a competition between $^{59}$Cu(p,$\alpha$)$^{56}$Ni and $^{59}$Cu(p,$\gamma$)$^{60}$Zn, could potentially halt the production of heavier elements. Here, we report the first direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni using a re-accelerated $^{59}$Cu beam and cryogenic solid hydrogen target. Our results show that the reaction proceeds predominantly to the ground state of $^{56}$Ni and the experimental rate has been found to be lower than Hauser-Feshbach-based statistical predictions. New results hint that the $\nu p$-process could operate at higher temperatures than previously inferred and therefore remains a viable site for synthesizing the heavier elements.

作者：R. Coleman、S. Upadhyayula、A. Psaltis、G. F. Grinyer、M. Williams、Z. Meisel、M. Rocchini、C. Andreoiu、B. Davids、G. Christian、R. Kanungo、C. Svensson、N. Nikhil、C. Waterfield、M. Singh、A. Talebitaher、S. S. Bhattacharjee、J. Williams、P. Subramaniam、J. Refsgaard、P. Garrett、R. Jain、M. Alcorta、T. Ahn、A. A. Chen、N. Saei、A. Radich、A. Laffoley、G. Hackman、J. S. Randhawa、K. Kapoor、A. Lennarz、P. Mohr、J. Liang、R. Kr¨1cken、E. Gyabeng Fuakye、M. Saxena

作者单位：

DOI：10.1103/PhysRevC.104.L042801

学科分类：原子能技术基础理论物理学天文学

推荐引用：R. Coleman,S. Upadhyayula,A. Psaltis,G. F. Grinyer,M. Williams,Z. Meisel,M. Rocchini,C. Andreoiu,B. Davids,G. Christian,R. Kanungo,C. Svensson,N. Nikhil,C. Waterfield,M. Singh,A. Talebitaher,S. S. Bhattacharjee,J. Williams,P. Subramaniam,J. Refsgaard,P. Garrett,R. Jain,M. Alcorta,T. Ahn,A. A. Chen,N. Saei,A. Radich,A. Laffoley,G. Hackman,J. S. Randhawa,K. Kapoor,A. Lennarz,P. Mohr,J. Liang,R. Kr¨1cken,E. Gyabeng Fuakye,M. Saxena.First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos[EB/OL].(2021-07-12)[2025-08-10].https://arxiv.org/abs/2107.05606.点此复制

First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos

First direct measurement of $^{59}$Cu(p,$\alpha$)$^{56}$Ni: A step towards constraining the Ni-Cu cycle in the Cosmos

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