Nuclear Structure 2022

13-17 June 2022
Berkeley, CA
US/Pacific timezone

Determination of the neutron-deficient $^{54}$Ni charge radius and symmetry energy constraints using the difference in mirror pair charge radii

15 Jun 2022, 09:30
20m
Oral Oral Presentations

Speaker

Skyy Pineda (Department of Chemistry, Michigan State University)

Description

Different parameterizations of Skyrme energy density functionals show large variations in the stiffness of the neutron equation of state (EOS), making extrapolations to higher densities uncertain [bro00]. It has been shown that the difference in mirror pair charge radii is correlated with the L parameter, which is the slope of the symmetry energy in the nuclear EOS [bro17]. By placing constraints on L, the neutron equation of state can thereby be constrained. In the present study, the charge radius of neutron-deficient 54Ni was determined for the first time using collinear laser spectroscopy at the BEam COoling and LAser spectroscopy (BECOLA) facility [min13, ros14] at NSCL/MSU. Using the difference in mirror pair charge radii between 54Ni and 54Fe, a constraint of 20 ≤ L ≤ 70 MeV has been placed [pin21], consistent with results from the gravitational wave event of the GW170817 neutron star merger [rai19] and barely consistent with those from PREX-II [ree21]. Constraints on the neutron skin for 48Ca from this experiment are in agreement with the preliminary CREX results released at DNP 2021, implying a “soft” EOS and contradictory to the PREX results. In addition to the experimental results, a new trend analysis will be discussed, which evaluates the reliability of the difference in mirror charge radii as a good isovector indicator [rei22].

*This work was supported in part by grants NSF No. PHY-15-65546, PHY-21-10365 and PHY-21-11185; German Research Foundation SFB1245.

References
[min13] K. Minamisono et al., Nucl. Instrum. Methods Phys. Res., Sect. A 709, 85 (2013).
[ros14] D. M. Rossi et al. Rev. Sci. Instrum. 85, 093503 (2014)
[bro17] B. A. Brown, Phys. Rev. Lett. 119, 122502 (2017).
[bro00] B. A. Brown, Phys. Rev. Lett. 85, 5296 (2000).
[pin21] S. V. Pineda et al. Phys. Rev. Lett. 127, 182503 (2021).
[ree21] B. T. Reed et al., Phys. Rev. Lett. 126, 172503 (2021).
[rai19] C. Raithel and F. Özel, Ap. J. 885:121 (2019).
[rei22] P.-G. Reinhard and W. Nazarewicz, Phys. Rev. C 105, L021301 (2022).

Primary author

Skyy Pineda (Department of Chemistry, Michigan State University)

Co-authors

Dr Kristian König (TU Darmstadt) Dr Dominic Rossi (Institut für Kernphysik, Technischen Universität Darmstadt) Dr B. Alex Brown (Department of Physics and Astronomy, Michigan State University) Mr Anthony Invorvati (Department of Physics and Astronomy, Michigan State University) Mr J. D. Lantis (Department of Chemistry, Michigan State University) Dr K. Minamisono (National Superconducting Cyclotron Laboratory, Michigan State University, Department of Physics and Astronomy, Michigan State University) Prof. W. Nörtershäuser (Institute für Kernphysik, Technische Universität Darmstadt) Prof. J. Piekarewicz (Department of Physics, Florida State University, Tallahassee, Florida 32306, USA) Mr R. C. Powel (Department of Physics and Astronomy, Michigan State University) Mr F. Sommer (Institute für Kernphysik, Technische Universität Darmstadt)

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