Speaker
Description
Cadmium is attractive for optical lattice clocks and for searches for Dark Matter and beyond-Standard-Model physics via isotope shift measurements. The cadmium clock transition has a small sensitivity to blackbody radiation and it has 8 stable isotopes, 6 spin 0 bosonic isotopes, and 2 spin ½ fermionic isotopes. Without using 229 nm light to drive the singlet transition, we capture thermal Cd atoms directly into a 326 nm narrow-line MOT. We then increase the loading rate by capturing atoms using the 361 nm $^{3}\textrm{P}_{2}\rightarrow\,^{3}\textrm{D}_{3}$ transition. We measure the isotope shifts of the 326 nm intercombination transition, and the 480 nm $^{3}\textrm{P}_{1}\rightarrow\,^{3}\textrm{S}_{1}$ and $^{3}\textrm{P}_{2}\rightarrow\,^{3}\textrm{D}_{3}$ transitions. These clarify a discrepancy of the nuclear charge radius and suggest that cadmium isotope shifts can sensitively test beyond standard model physics.
