Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-01-15
Phys.Rev.D50:7128-7143,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 5 .ps-figure, Preprint JINR E2-93-448
Scientific paper
10.1103/PhysRevD.50.7128
We investigate the role of nuclear spin in elastic scattering of Dark Matter (DM) neutralinos from nuclei in the framework of the Minimal SUSY standard model (MSSM). The relative contribution of spin-dependent axial-vector and spin-independent scalar interactions to the event rate in a DM detector has been analyzed for various nuclei. Within general assumptions about the nuclear and nucleon structure we find that for nuclei with atomic weights $A > 50$ the spin-independent part of the event rate $R_{si}$ is larger than the spin-dependent one $R_{sd}$ in the domain of the MSSM parameter space allowed by the known experimental data and where the additional constraint for the total event rate $R =R_{sd} + R_{si} > 0.01$ is satisfied. The latter reflects realistic sensitivities of present and near future DM detectors. Therefore we expect equal chances for discovering the DM event either with spin-zero or with spin-non-zero isotopes if their atomic weights are $A_{1} \sim A_{2} > 50$.
Bednyakov Vadim A.
Klapdor-Kleingrothaus Hans Volker
Kovalenko Sergey G.
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