  The local alpha strength is proposed to quantify the possibility to form an
alpha particle at a specific location inside the nucleus. It also provides the
strength of ground and excited states in the residual nuclei after the removal
of the alpha particle. We use the Hartree-Fock-plus-BCS (HF+BCS) method in the
calculation of the local alpha strengths for Sn isotopes. The local alpha
strengths are easily calculable and the results are consistent with recent
experimental data for Sn isotopes.
