非表示:
キーワード:
High Energy Physics - Experiment, hep-ex, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,High Energy Physics - Phenomenology, hep-ph
要旨:
A search for 5.5-MeV solar axions produced in the $p+d\rightarrow\rm{^3He}+A
(5.5 \rm{MeV})$ reaction was performed using the Borexino detector. The Compton
conversion of axions to photons, ${\rm A}+e\rightarrow e+\gamma$; the
axio-electric effect, ${\rm A}+e+Z\rightarrow e+Z$; the decay of axions into
two photons, ${\rm A}\rightarrow2\gamma$; and inverse Primakoff conversion on
nuclei, ${\rm A}+Z\rightarrow\gamma+Z$, are considered. Model independent
limits on axion-electron ($g_{Ae}$), axion-photon ($g_{A\gamma}$), and
isovector axion-nucleon ($g_{3AN}$) couplings are obtained: $|g_{Ae}\times
g_{3AN}| \leq 5.5\times 10^{-13}$ and $|g_{A\gamma}\times g_{3AN}| \leq
4.6\times 10^{-11} \rm{GeV}^{-1}$ at $m_A <$ 1 MeV (90% c.l.). These limits are
2-4 orders of magnitude stronger than those obtained in previous
laboratory-based experiments using nuclear reactors and accelerators.
