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  • Letter
  • Open Access

Exploring the mass radius of He4 and implications for nuclear structure

Rong Wang*, Chengdong Han†, and Xurong Chen‡

  • Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

  • *rwang@impcas.ac.cn
  • †chdhan@impcas.ac.cn
  • ‡xchen@impcas.ac.cn
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Phys. Rev. C 109, L012201 – Published 4 January, 2024

DOI: https://doi.org/10.1103/PhysRevC.109.L012201

Abstract

In this study, we determine the mass radius of He4, a very light nucleus, by examining the near-threshold ϕ-meson photoproduction data of the LEPS Collaboration. To assess the gravitational form factor of He4, we employ multiple models for the mass distribution, including Yukawa-type, exponential, Gaussian, and uniform functions. The mass radius of He4 is measured to be 1.70±0.14 fm, which is approximately equal to the charge radius of He4. Surprisingly, in contrast to the findings of the proton, no noticeable discrepancy between the charge radius and the mass radius is noted for the He4 nucleus. The proton and neutron distributions within He4 are likely to be identical, confirming its regular tetrahedral structure in a new way. We propose exploring the difference between charge and mass radii as a new approach to examine the nuclear structure.

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Phys. Rev. C 109, L012201– Published 4 January, 2024
  • Received 3 November 2023
  • Accepted 8 December 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

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