The inclusive μ−e conversion process with renormalized quasiparticle random-phase approximation Original Research Article

The inclusive process of the neutrinoless muon-to-electron conversion in nuclei is investigated by using the renormalized quasiparticle random-phase approximation (RQRPA). This approach is an improvement of the ordinary QRPA which restores the Pauli principle. It is a more reliable method for extremely small transition matrix elements as for the (μ−,e−) conversion. Our calculations refer to a set of nuclei throughout the periodic table but we specifically investigate those isotopes for which experiments are done or planned. We study in particular View the MathML source which is at present used as a target at PSI in the new ongoing μ−e conversion experiment with the SINDRUM II spectrometer.