Measurement of quadrupole deformations from E2 transitions in order to identify candidate isotopes for atomic EDM measurement

ORAL

Abstract

Measuring a non-zero electric dipole moment (EDM) helps us seek new sources of CP violations and explore new physics beyond the Standard Model. We aim to characterize nuclear deformation since atomic EDM and magnetic quadrupole moment (MQM) are enhanced in octupole and quadrupole-deformed nuclei, respectively. We use data from the National Nuclear Data Center to gather information on the nuclear level scheme by surveying the energy levels relevant for electric quadrupole (E2) transitions from the ground state while ensuring the ground state parity doublet is not degenerate. To identify quadrupole deformation in the mass ranges from A=150 to 250, we produce a Weisskopf plot where the transition lifetime is a function of transition energy. We identify likely deformed nuclei by comparing existing experimental data to Weisskopf estimates. While the Weisskopf plot gives us qualitative information regarding nuclear deformation, we support these by explicitly calculating the quadrupole deformation using transition lifetimes. We have computationally calculated Eλ and Mλ transition matrix elements to supplement our calculation of quadrupole deformation from E2 transition strengths via the measurement of transition lifetimes. We present preliminary results on the experimental determination of quadrupole deformation of certain nuclei.

Presenters

  • Lixin Qin

    Massachusetts Institute of Technology

Authors

  • Lixin Qin

    Massachusetts Institute of Technology

  • Prajwal T MohanMurthy

    Massachusetts Institute of Technology