Triaxial shape of the one-proton emitter ¹⁴⁹Lu

We revisit the proton emitter ¹⁴⁹Lu utilizing the recently developed triaxial relativistic Hartree-Bogoliubov theory in continuum (TRHBc). By incorporating the microscopic nuclear structure properties from the TRHBc theory into the WKB approximation, we successfully reproduce the measured proton-emission half-life of ¹⁴⁹Lu within experimental uncertainties. A triaxial ground state characterized by (β=0.17,γ=31^∘) has been clarified for ¹⁴⁹Lu. The inclusion of triaxiality significantly changes nuclear density distributions and potentials, which results in enhanced binding of both the nuclear system and the proton-emitting orbital. As a result, a slightly extended half-life for the proton emission of ¹⁴⁹Lu is achieved after considering triaxial deformation degrees of freedom.