Calculated Event Rates for Axion Detection via Atomic and Nuclear Processes

Table 2

Isoscalar and isovector spin-dependent matrix elements of ²³Na from the ground () to the various excited states entering the axion-induced photoproduction. We also include the total nuclear matrix elements ME², including the spin-independent one appearing in the coherent mode, which contain the factor related to the photon energy, and the relevant cross sections as well. Note that states up to the axion energy of 5.5 MeV are relevant.

(MeV)					cm^2
0 (coherent)				200	791
0.0000	0.4756	0.3450	0.4051	0.4721	1.889
0.4120	0.2024	0.2589	0.2289	0.2628	0.832
2.3240	0.1868	0.1286	0.1550	0.1814	0.140
2.7470	0.4689	0.3665	0.4145	0.4807	0.241
3.8930	0.0934	0.0928	0.0931	0.1069	0.011
4.3110	0.5066	0.4589	0.4821	0.5551	0.022
5.2460	0.0931	0.1184	0.1050	0.1205	0.000
5.7460	0.0474	0.0708	0.0579	0.0668	—
5.9760	0.0105	0.0046	0.0070	0.0086	—