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In this experiment we aim to look for keV-mass bosons emitted from the Sun,by looking at a process analogous to the photoelectric/Compton effect insidethe HPGe detector. Their coupling to both electrons and nucleons is assumed.For masses above 25 keV, the mass dependence of our limit on thescalar-electron coupling reveals a constraint which proves stronger than thatobtained recently and based on the very good agreement between the measured andpredicted solar neutrino flux from the ^{8}B reaction. On the other hand, themass dependence of our limit on the scalar-proton/electron coupling togetherentails a limit on a possible Yukawa addition to the gravitational inversesquare low. Such a constraint on the Yukawa interactions proves much strongerthan that derived from the latest AFM Casimir force measurement.

Hunting up low-mass bosons from the Sun using HPGe detector