Table 1. Dimensionless low order eigenvalues , with σ ₀ = 10⁻²⁰ m² for positrons in water using the cross-section set of Refs ²¹, ²², ²³, ²⁴, ²⁵, and the static structure factor of Ref. 26.

Order	(gas phase)	(liquid phase)
0	1.32 × 10−8	1.88 × 10−7
1	0.68	2.68
2	1.33	2.91

Since N ≈ 3 × 10²⁸ m³ for liquid water, .