Theoretical direct WIMP detection rates for transitions to the first excited state inKr83

Inelastic WIMP-nucleus scattering to the first excited state in125Te

“…In the present study, however, we assume that the detector is going to be a bolometer, which is characterized by a quenching factor approximately unity. So in this case the inelastic channel cannot benefit as much from the fact that the quenching factor tends to suppress the ground state transition in the presence of significant energy threshold as found previously [54,73].…”

“…The configurations of the 1/2 + and 3/2 + states are ν3s 1/2 and ν2d 3/2 , respectively, while the configurations of 5/2 + and 7/2 + are mixed character of both ν3s 1/2 and ν2d 3/2 orbits. We have also calculated electromagnetic properties which are shown in Tables III and IV The static spin matrix elements (MEs) obtained from this calculation are Ω 0 = 1.456, Ω 1 = −1.502 for elastic transitions, Looking at these matrix elements we notice that the nuclear matrix elements relevant for the inelastic scattering are, as expected, smaller than those entering the elastic scattering, but they are not suppressed as much as those relevant for the target 83 Kr [54], the latter favored kinematically due to its lower excitation energy. We also notice that the nuclear structure does not favor the isoscalar contribution to overcome the suppression of the corresponding isoscalar amplitude due to the structure of the nucleon.…”

“…For completeness we mention that, in addition to the isotopes 127 I , 129 Xe [73] and 83 Kr [54] discussed previously, another possibility is the 73 Ge target, in high energy resolution Ge detectors. In short, the present paper, in conjunction with the earlier calculations [54,73], indicates that the inelastic scattering opens a new powerful way to search for WIMPs via the SD interaction with the nuclear targets.…”

“…y esc ≈ 2.84. The values u min , u max , (E R ) min and (E R ) max relevant for the inelastic scattering of 83 Kr and 125 Te can be found in our eralier work [54].…”

“…Experimentally, inelastic nuclear excitations provide unique opportunities for studying SD rates for WIMP-nuclear interactions. Inelastic excitations can, in principle, be studied by two ways: A singles measurement of both the nuclear recoil energy E R and the decaying γ-ray energy E γ in one detector, and B a coincidence measurement of the nuclear recoil and the γ-ray in two separate detectors in a fashion discussed in the earlier analysis [54,73]. In the case of 125 Te we will consider only option A (see [54,73] for details).…”