arXiv 2209.030512022-09-07nucl-ex

$^{22}$ Ne（α，γ）$^{26}$ Mg反应中334 keV共振强度的第一直接极限

First direct limit on the 334 keV resonance strength in the $^{22}$Ne(α,γ)$^{26}$Mg reaction

D. Piatti, E. Masha, M. Aliotta, J. Balibrea-Correa, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli, F. Cavanna, T. Chiller… 展开作者

D. Piatti, E. Masha, M. Aliotta, J. Balibrea-Correa, F. Barile, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C. G. Bruno, A. Caciolli, F. Cavanna, T. Chillery, G. F. Ciani, A. Compagnucci, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. di Leva, Z. Elekes, F. Ferraro, E. M. Fiore, A. Formicola, Zs. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, Gy. Gyürky, G. Imbriani, M. Junker, M. Lugaro, P. Marigo, R. Menegazzo, V. Mossa, F. R. Pantaleo, V. Paticchio, R. Perrino, P. Prati, D. Rapagnani, L. Schiavulli, J. Skowronski, K. Stöckel, O. Straniero, T. Szücs, M. P. Takács, S. Zavatarelli

备注：: Submitted to Eur. Phys. J. A
发表信息：: Eur. Phys. J. A 58, 194 (2022)
DOI：: 10.1140/epja/s10050-022-00827-2

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摘要：

在恒星中，$^{22}$ Ne和$^4$ He的融合可能会产生$^{25}$ Mg，并发射出中子，或者产生$^{26}$ Mg和$γ$射线。在高温下，（$α,n$）通道占主导地位，而在低温下，它在能量上受到阻碍。它的竞争者，$^{22}$ Ne（$α$，$γ$）$^{26}$ Mg反应的速率，以及（$α,n$）占优势的最低温度，由许多核共振控制。迄今为止，这些共振的强度仅被间接研究。目前的工作旨在直接测量在$E$ _{r} $\,=\,$ 334 $\,$ keV（对应于$^{26}$ Mg中的$E$ _{x} $\,=\,$ 10949 $\,$ keV）处的共振的总强度。本文报道的数据是用INFN LUNA 400 kV地下加速器的高强度$^4$ He $^+$束流、无窗、再循环、99.9%同位素富集的$^{22}$ Ne气体靶和4 $π$锗酸铋求和$γ$射线探测器获得的。低于0.5计数/天的超低本底率是使用67天的无束数据和7天的$^4$ He $^+$束在惰性氩靶上测定的。新的高灵敏度设置允许确定共振强度的第一个直接上限4.0 $\,\times\,$ 10 $^{-11}$ eV（90%置信水平）。最后，该装置的灵敏度为进一步研究更高能量下的$^{22}$ Ne（$α$，$γ$）$^{26}$ Mg共振铺平了道路。

英文摘要：

In stars, the fusion of $^{22}$Ne and $^4$He may produce either $^{25}$Mg, with the emission of a neutron, or $^{26}$Mg and a $γ$ ray. At high temperature, the ($α,n$) channel dominates, while at low temperature, it is energetically hampered. The rate of its competitor, the $^{22}$Ne($α$,$γ$)$^{26}$Mg reaction, and, hence, the minimum temperature for the ($α,n$) dominance, are controlled by many nuclear resonances. The strengths of these resonances have hitherto been studied only indirectly. The present work aims to directly measure the total strength of the resonance at $E$_{r}$\,=\,$334$\,$keV (corresponding to $E$_{x}$\,=\,$10949$\,$keV in $^{26}$Mg). The data reported here have been obtained using high intensity $^4$He$^+$ beam from the INFN LUNA 400 kV underground accelerator, a windowless, recirculating, 99.9% isotopically enriched $^{22}$Ne gas target, and a 4$π$ bismuth germanate summing $γ$-ray detector. The ultra-low background rate of less than 0.5 counts/day was determined using 67 days of no-beam data and 7 days of $^4$He$^+$ beam on an inert argon target. The new high-sensitivity setup allowed to determine the first direct upper limit of 4.0$\,\times\,$10$^{-11}$ eV (at 90% confidence level) for the resonance strength. Finally, the sensitivity of this setup paves the way to study further $^{22}$Ne($α$,$γ$)$^{26}$Mg resonances at higher energy.

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