Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgements
- List of symbols and abbreviations
- Part I Dark matter in cosmology
- Part II Candidates
- Part III Collider searches
- Part IV Direct detection
- 17 Direct detection of WIMPs
- 18 Annual modulation signature with large mass highly radiopure NaI(Tl)
- 19 Particle dark matter and the DAMA/NaI and DAMA/LIBRA annual modulation effect
- 20 Cryogenic detectors
- 21 Liquid noble gases
- 22 Directional detectors
- 23 Axion searches
- Part V Indirect detection and astrophysical constraints
- References
- Index
19 - Particle dark matter and the DAMA/NaI and DAMA/LIBRA annual modulation effect
Published online by Cambridge University Press: 04 August 2010
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgements
- List of symbols and abbreviations
- Part I Dark matter in cosmology
- Part II Candidates
- Part III Collider searches
- Part IV Direct detection
- 17 Direct detection of WIMPs
- 18 Annual modulation signature with large mass highly radiopure NaI(Tl)
- 19 Particle dark matter and the DAMA/NaI and DAMA/LIBRA annual modulation effect
- 20 Cryogenic detectors
- 21 Liquid noble gases
- 22 Directional detectors
- 23 Axion searches
- Part V Indirect detection and astrophysical constraints
- References
- Index
Summary
The DAMA annual modulation effect
The DAMA experiment [311; 314; 319; 320; 328] consists of low-background, highly radiopure NaI(Tl) scintillators with very stable response over long time periods. These characteristics allow the DAMA experiment to look for the annual modulation [719; 881] of the counting rate: this peculiar effect is expected if the Galactic halo is composed of DM particles interacting with the target detector and represents a specific signature for the direct search of DM.
The experiment operated in the first phase as DAMA/NaI for 7 years with a mass of about 100 kg and collected a total exposure of 0.29 ton × yr [310; 312; 315; 319; 320]. The second phase is now under operation as DAMA/LIBRA, which recently released data on an additional four annual cycles with a mass of about 250 kg, adding 0.53 ton×yr to the total exposure. The cumulative analysis of the single-hit residual rate of the DAMA/NaI and DAMA/LIBRA detectors favours at 8.2σ C.L. the presence of annual modulation with the features which are expected from a DM candidate [Chapter 18; 319; 324].
In the case of WIMP DM which scatters off the nuclei of the detector, the DAMA annual modulation effect provides direct information on two basic properties of the DM particle: the particle mass mχ and its elastic scattering cross-section off nuclei. The latter is then usually and more conveniently translated into the cross-section on a single nucleon, in the case of both coherent and spin-dependent interactions.
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- Particle Dark MatterObservations, Models and Searches, pp. 383 - 390Publisher: Cambridge University PressPrint publication year: 2010
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