Technical Progress Towards Measurement of the Anapole Moment of $^{\mathrm{137}}$Ba$^{\mathrm{19}}$F

Nuclear spin-dependent parity violation (NSD-PV) effects are due to several interactions, including the nuclear anapole moment, a parity-violating electromagnetic moment confined to the interior of the nucleus. The supersonic beam source generated the proof-of-principle results for the $^{\mathrm{138}}$Ba$^{\mathrm{19}}$F control molecule for the naturally abundant but spin-0 $^{\mathrm{138}}$Ba nucleus. We have improved the apparatus by incorporating a pulse-tube refrigerator to produce a bright buffer-gas source of $^{\mathrm{137}}$Ba$^{\mathrm{19}}$F molecules at cryogenic temperatures, building an MTS-locked (modulation transfer spectroscopy) laser and PDH (Pound-Drever-Hall)-locked cavity for laser locking to address the largest systematic found in earlier work, and performing the laser spectroscopy of $^{\mathrm{137}}$Ba$^{\mathrm{19}}$F.