First direct limit on the 334 keV resonance strength in $$^{22}$$Ne($$\alpha $$,$$\gamma $$)$$^{26}$$Mg reaction
نویسندگان
چکیده
In stars, the fusion of $^{22}$Ne and $^4$He may produce either $^{25}$Mg, with emission a neutron, or $^{26}$Mg $\gamma$ ray. At high temperature, ($\alpha,n$) channel dominates, while at low it is energetically hampered. The rate its competitor, $^{22}$Ne($\alpha$,$\gamma$)$^{26}$Mg reaction, and, hence, minimum temperature for dominance, are controlled by many nuclear resonances. strengths these resonances have hitherto been studied only indirectly. present work aims to directly measure total strength resonance $E$_{r}$\,=\,$334$\,$keV (corresponding $E$_{x}$\,=\,$10949$\,$keV in $^{26}$Mg). data reported here obtained using intensity $^4$He$^+$ beam from INFN LUNA 400 kV underground accelerator, windowless, recirculating, 99.9% isotopically enriched gas target, 4$\pi$ bismuth germanate summing $\gamma$-ray detector. ultra-low background less than 0.5 counts/day was determined 67 days no-beam 7 on an inert argon target. new high-sensitivity setup allowed determine first direct upper limit 4.0$\,\times\,$10$^{-11}$ eV (at 90% confidence level) strength. Finally, sensitivity this paves way study further higher energy.
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2022
ISSN: ['1434-6001', '1434-601X']
DOI: https://doi.org/10.1140/epja/s10050-022-00827-2