Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-19
Phys.Rev. D61 (2000) 063503
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 1 figure in text, latex
Scientific paper
10.1103/PhysRevD.61.063503
We consider the potential benefits of searching for supersymmetric dark-matter through its inelastic excitation, via the "scalar current", of low-lying collective nuclear states in a detector. If such states live long enough so that the gamma radiation from their decay can be separated from the signal due to nuclear recoil, then background can be dramatically reduced. We show how the kinematics of neutralino-nucleus scattering is modified when the nucleus is excited and derive expressions for the form factors associated with exciting collective states. We apply these results to two specific cases: 1) the 5/2^+ state at 13 keV in 73Ge, and 2) the rotational and hence very collective state 3/2^+ at 8 keV in 169Tm (even though observing the transition down from that state will be difficult). In both cases we compare the form factors for inelastic scattering with those for elastic scattering. The inelastic cross section is considerably smaller than its elastic counterpart, though perhaps not always prohibitively so.
Engel Johannes
Vogel Petr
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