Speaker
Description
The measurement of a permanent electric dipole moment (EDM) in atoms is crucial for understanding the origins of CP-violation. Quadrupole and octupole deformed nuclei exhibit significantly enhanced atomic EDM. However, accurate interpretation of the EDM in such systems requires the characterization of their deformation. While nuclear deformation is indicated in various structure models, experimental confirmation, particularly in heavy isotopes essential for EDM measurements, is lacking.
Nuclear E$2$ $\gamma$-ray transitions allow access to quantify quadrupole deformation, but these transitions are often mixed with M$1$ transitions. Both E$2$ and M$1$ transitions are well characterized by Weisskopf estimates, which rely on a single-particle approximation. However, deviations from measurements arise due to collective nuclear deformation. To utilize E$2$ and E$2$+M$1$ transition lifetimes for determining quadrupole deformation, accurate Weisskopf estimates for heavy nuclei are essential. Currently, Weisskopf estimates are only available for the mass range $A<150$.
This work extends Weisskopf estimates for non-deformed nuclei in the mass range $150 < A < 250$, aided by theoretical structure models. This facilitates a comprehensive study of the deviation of E$2$ and M$1+$E$2$ transition lifetimes from the newly established Weisskopf estimates in deformed isotopes. Estimates of collective nuclear quadrupole deformation in isotopes relevant to EDM measurements, obtained from M$1+$E$2$ transition lifetimes, will be presented, also aiding in the identification of isotopes lacking definitive measurements for quadrupole deformation.
| session | I. Nuclear Structure and Reactions |
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