Dark Matter Investigation by Dama at Gran Sasso

Abstract

Experimental observations and theoretical arguments at Galaxy and larger scales have suggested that a large fraction of the Universe is composed by Dark Matter particles. This has motivated the DAMA experimental efforts to investigate the presence of such particles in the galactic halo by exploiting a model independent signature and very highly radiopure set-ups deep underground. Few introductory arguments are summarized before presenting a review of the present model independent positive results obtained by the DAMA/NaI and DAMA/LIBRA set-ups at the Gran Sasso National Laboratory of the INFN. Implications and model dependent comparisons with other different kinds of results will be shortly addressed. Some arguments put forward in literature will be confuted.

New results and perspectives of DAMA/LIBRA

“…The residuals of the DAMA/NaI data (0.29 ton × yr) are given in Ref. [2,8,16,17]. We remind that these residual rates are calculated from the measured rate of the single-hit events after subtracting the constant part: < r i jk − f lat jk > jk .…”

“…The data analysis procedure has been described in details in Ref. [8]. A clear peak corresponding to a period of 1 year (see Fig.…”

“…[2][3][4]8], it has been verified that the observed annual modulation effect is well distributed in all the 25 detectors at 95% C.L.…”

“…[1][2][3][4] and references therein; additional arguments can be found in Ref. [7,8,[32][33][34][35][36][37][38].…”

“…The presently running DAMA/LIBRA [1][2][3][4][5][6][7][8][9][10][11] experiment, as the former DAMA/NaI [12][13][14][15][16][17][18][19][20][21][22][23][24][25], has the main aim to investigate the presence of DM particles in the galactic halo by exploiting the model independent DM annual modulation signature (originally suggested in Ref. [26]).…”