Indirect detection of dark matter absorption in the Galactic Center
arxiv(2024)
摘要
We consider the nuclear absorption of dark matter as an alternative to the
typical indirect detection search channels of dark matter decay or
annihilation. In this scenario, an atomic nucleus transitions to an excited
state by absorbing a pseudoscalar dark matter particle and promptly emits a
photon as it transitions back to its ground state. The nuclear excitation of
carbon and oxygen in the Galactic Center would produce a discrete photon
spectrum in the 𝒪(10) MeV range that could be detected by gamma-ray
telescopes. Using the large-scale shell-model code, we
calculate the excitation energies of carbon and oxygen. We constrain the dark
matter-nucleus coupling for current COMPTEL data, and provide projections for
future experiments AMEGO-X, e-ASTROGAM, and GRAMS for dark matter masses from
∼ 10 to 30 MeV. We find the excitation process to be very sensitive to the
dark matter mass and find that the future experiments considered would improve
constraints on the dark matter-nucleus coupling within an order of magnitude.
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