2012/03/28 by The Borexino Collaboration · 1 citation
Physics and Astronomy · #hep-ex #astro-ph.SR #hep-ph
paper · pdf · doi:10.1103/physrevd.85.092003
published as Physical Review D 85, 092003 (2012) · 11 pages, 7 figures, submitted to Phys.Rev.D
arxiv created 2012/03/28 · arxiv updated 2012/08/27
A search for 5.5-MeV solar axions produced in the p+d→\rm3He+A (5.5 \rmMeV) reaction was performed using the Borexino detector. The Compton conversion of axions to photons, \rm A+e→ e+γ; the axio-electric effect, \rm A+e+Z→ e+Z; the decay of axions into two photons, \rm A→2γ; and inverse Primakoff conversion on nuclei, \rm A+Z→γ+Z, are considered. Model independent limits on axion-electron (gAe), axion-photon (gAγ), and isovector axion-nucleon (g3AN) couplings are obtained: |gAe× g3AN| ≤ 5.5× 10-13 and |gAγ× g3AN| ≤ 4.6× 10-11 \rmGeV-1 at mA < 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.