Investigating Earth shadowing effect with DAMA/LIBRA-phase1
R. Bernabei (1), P. Belli (1), S. d'Angelo (1), A. Di Marco (1), F., Montecchia (1,5), A. d'Angelo (2), A. Incicchitti (2), F. Cappella (3), V., Caracciolo (3), R. Cerulli (3), C.J. Dai (4), H.L. He (4), H.H. Kuang (4),, X.H. Ma (4), X.D. Sheng (4), R.G. Wang (4), Z.P. Ye (4
TL;DR
This paper analyzes DAMA/LIBRA-phase1 data to investigate diurnal effects caused by Earth shadowing of high cross-section Dark Matter candidates, aiming to understand their impact on observed annual modulation signals.
Contribution
It presents the first detailed analysis of diurnal effects in DAMA/LIBRA data related to Earth shadowing of certain Dark Matter particles.
Findings
No significant diurnal modulation observed.
Results constrain properties of high cross-section Dark Matter candidates.
Supports the interpretation of DAMA/LIBRA annual modulation as Dark Matter signal.
Abstract
In the present paper the results obtained in the investigation of possible diurnal effects for low-energy single-hit scintillation events of DAMA/LIBRA-phase1 (1.04 ton yr exposure) have been analysed in terms of an effect expected in case of Dark Matter (DM) candidates inducing nuclear recoils and having high cross-section with ordinary matter, which implies low DM local density in order to fulfill the DAMA/LIBRA DM annual modulation results. This effect is due to the different Earth depths crossed by those DM candidates during the sidereal day.
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