Precise Calibration of Laser Frequency for determination of Ni Charge Radius

ORAL

Abstract

Collinear laser spectroscopy is commonly used to determine charge radii, and requires accurate and precise knowledge of the laser frequency to a level of roughly 1 MHz. A Doppler-free laser spectroscopic system has been implemented at the BECOLA facility to calibrate the laser frequency against precisely-known transitions in molecular iodine. After calibration, the laser system will be used to determine charge radius of $^{\mathrm{54}}$Ni, which is important to address the soft nature [1] of doubly-magic $^{\mathrm{56}}$Ni as well as to deduce the slope parameter, $L$, in the symmetry energy of the nuclear equation of state [2]. The performance characteristics of the laser frequency calibration system will be presented and the results will be discussed. [1] M. Honma et al., Phys. Rev. C 65, 061301 (2002). [2] B. A. Brown et al., Phys. Rev. Research 2, 022035 (R) (2020).

*This work was supported in part by NSF Grant NOs. PHY-15-65546 and PHY-19-13509, and U.S. DOE grant DE-NA0002924.

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Authors

  • Robert Powel

    • NSCL/Dept. of Physics and Astronomy,MSU
    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Andrew Klose

    • Department of Chemistry, Augustana University, Sioux Falls, SD 57197, USA

  • David Garand

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Kristian Koenig

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Jeremy Lantis

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Yuan Liu

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Kei Minimisono

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA

  • Skyy Pineda

    • National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA