Direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni precludes a strong NiCu cycle in Type-I X-ray bursts
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Bhathi, N. Randhawa, J. S. Kanungo, R. Refsgaard, J. Alcorta, M. Ahn, T. Andreoiu, C. Bardayan, D. Bhattacharjee, S. S. Davids, B. Christian, G. Chen, A. A. Coleman, R. Garrett, P. E. Grinyer, G. F. Fuakye, E. Gyabeng Hackman, G. Jain, R. Kapoor, K. Krucken, R. Laffoley, A. Lennarz, A. Liang, J. Meisel, Z. Psaltis, A. Radich, A. Rocchini, M. Rojo, J. S. Saei, N. Saxena, M. Singh, M. Svensson, C. E. Subramaniam, P. Talebitaher, A. Upadhyayula, S. Waterfield, C. Williams, J. Williams, M. Zubair, M. A. |
| author_facet | Bhathi, N. Randhawa, J. S. Kanungo, R. Refsgaard, J. Alcorta, M. Ahn, T. Andreoiu, C. Bardayan, D. Bhattacharjee, S. S. Davids, B. Christian, G. Chen, A. A. Coleman, R. Garrett, P. E. Grinyer, G. F. Fuakye, E. Gyabeng Hackman, G. Jain, R. Kapoor, K. Krucken, R. Laffoley, A. Lennarz, A. Liang, J. Meisel, Z. Psaltis, A. Radich, A. Rocchini, M. Rojo, J. S. Saei, N. Saxena, M. Singh, M. Svensson, C. E. Subramaniam, P. Talebitaher, A. Upadhyayula, S. Waterfield, C. Williams, J. Williams, M. Zubair, M. A. |
| contents | Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning and a handful of reactions have been shown to impact the model results. Reactions in the NiCu cycles, featuring a competition between $^{59}$Cu($p$,$γ$)$^{60}$Zn and $^{59}$Cu($p$,$α$)$^{56}$Ni, have been shown to be among the most important reactions as they are a critical checkpoint in $rp$-process flow and significantly impact the light curves and burst ashes. We report a direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni bringing stringent constraints on this reaction rate. New results rule out a strong NiCu cycle in XRBs, with a negligible degree of recycling, $\leq$5\% up to 1.5 GK. The new reaction rate, when varied within new uncertainty limits, shows no impact on one-zone XRB model light-curves tailored for clocked-burster $\tt{GS 1826-24}$, hence removing an important nuclear physics uncertainty in the model-observation comparison. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_12025 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni precludes a strong NiCu cycle in Type-I X-ray bursts Bhathi, N. Randhawa, J. S. Kanungo, R. Refsgaard, J. Alcorta, M. Ahn, T. Andreoiu, C. Bardayan, D. Bhattacharjee, S. S. Davids, B. Christian, G. Chen, A. A. Coleman, R. Garrett, P. E. Grinyer, G. F. Fuakye, E. Gyabeng Hackman, G. Jain, R. Kapoor, K. Krucken, R. Laffoley, A. Lennarz, A. Liang, J. Meisel, Z. Psaltis, A. Radich, A. Rocchini, M. Rojo, J. S. Saei, N. Saxena, M. Singh, M. Svensson, C. E. Subramaniam, P. Talebitaher, A. Upadhyayula, S. Waterfield, C. Williams, J. Williams, M. Zubair, M. A. High Energy Astrophysical Phenomena Nuclear Experiment Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by nuclear burning and a handful of reactions have been shown to impact the model results. Reactions in the NiCu cycles, featuring a competition between $^{59}$Cu($p$,$γ$)$^{60}$Zn and $^{59}$Cu($p$,$α$)$^{56}$Ni, have been shown to be among the most important reactions as they are a critical checkpoint in $rp$-process flow and significantly impact the light curves and burst ashes. We report a direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni bringing stringent constraints on this reaction rate. New results rule out a strong NiCu cycle in XRBs, with a negligible degree of recycling, $\leq$5\% up to 1.5 GK. The new reaction rate, when varied within new uncertainty limits, shows no impact on one-zone XRB model light-curves tailored for clocked-burster $\tt{GS 1826-24}$, hence removing an important nuclear physics uncertainty in the model-observation comparison. |
| title | Direct measurement of $^{59}$Cu($p$,$α$)$^{56}$Ni precludes a strong NiCu cycle in Type-I X-ray bursts |
| topic | High Energy Astrophysical Phenomena Nuclear Experiment |
| url | https://arxiv.org/abs/2512.12025 |