Abstract
The results of a search for solar axions from the Korea Invisible Mass Search (KIMS) experiment at the Yangyang Underground Laboratory are presented. Low-energy electron-recoil events would be produced by conversion of solar axions into electrons via the axio-electric effect in CsI(Tl) crystals. Using data from an exposure of 34,596 $\rm kg \cdot days$, we set a 90 \% confidence level upper limit on the axion-electron coupling, $g_{ae}$, of $1.39 \times 10^{-11}$ for an axion mass less than 1 keV/$\rm c^2$. This limit is lower than the indirect solar neutrino bound, and fully excludes QCD axions heavier than 0.48 eV/$\rm c^2$ and 140.9 eV/$\rm c^2$ for the DFSZ and KSVZ models respectively.
Highlights
Korea Invisible Mass Search (KIMS) experimentThe KIMS experiment is designed to directly search for weakly interacting massive particles (WIMP) using CsI(Tl) crystal detectors
For this process as a signal for solar axion detection
In order to extract these fit parameters for surface α events (Sα) events, we applied fit to the data from a sample of a CsI crystal contaminated by 222Rn progenies
Summary
The KIMS experiment is designed to directly search for weakly interacting massive particles (WIMP) using CsI(Tl) crystal detectors. The experiment is housed in the Yangyang Underground Laboratory (Y2L) with an earth overburden of 700 m (2400 m water equivalent) and uses a 12 module array of low-background CsI(Tl) crystals with a total mass of 103.4 kg. Each detector module is composed of a CsI(Tl) crystal with dimension of 8 cm x 8 cm x 30 cm and with photomultiplier tubes (PMT) mounted at each end. The amplified signals from the PMTs on each crystal were recorded by a 400 MHz flash analogto-digital converter for a duration of 32 μs with the trigger condition requiring at least two photoelectrons (PEs) in both PMTs on each crystal within a 2 μs window. The number of PEs are 5 to 6 per keV. Details of the experiment can be found elsewhere [28,29,30]
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