New 0(+) resonance parameters have been extracted and interpreted in terms of the experimental neutron-proton branching ratio of d + d reactions in strontium and tantalum metallic lattices. The material-dependent cross-section formula, which includes the new 0(+) resonance parameters, the screening effect, and the effective mass, have been applied to d(d, p)H-3 and H-2 (d, n)He-3 reactions in metallic environments. The contributions of the 0(+) resonance and effective electron mass are crucial to the understanding of the discrepancy between the theoretical and experimental screening values in metallic environments. As a different and connected part of this research, we have proposed a new target material: deuterated metal wire mesh structures. Experimentally confirmed numerical results for Pendry's effective electron mass for aluminum metal wire have been used to calculate the cross-section and screening energy.