Calculated Event Rates for Axion Detection via Atomic and Nuclear Processes

Figure 7

(a) Event rates for the last four states 4.31 MeV, 5.24 MeV, 5.74 MeV, and 5.97 MeV of ²³Na (see Table 2) versus different axion masses. (b) The rate for axion photoproduction on ¹²⁷I. As expected, this is quite a bit smaller than in (a), due to the fact that the axion energy of 5.5 MeV is much smaller than the nucleon mass. Note, however, that in this case, we have the extra signature of the produced photon. Since the rate is dominated by the coherent mode, the photon energy is approximately equal to the axion energy.

(a)

(b)