Exploring the mass radius of <math><mmultiscripts><mi>He</mi><mprescripts/><none/><mn>4</mn></mmultiscripts></math> and implications for nuclear structure - INSPIRE

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Exploring the mass radius of ${}^{4}{He}$ and implications for nuclear structure

Rong Wang
(
- Lanzhou, Inst. Modern Phys. and
- Beijing, GUCAS
)
,
Chengdong Han
(
- Lanzhou, Inst. Modern Phys. and
- Beijing, GUCAS
)
,
Xurong Chen
(
- Lanzhou, Inst. Modern Phys. and
- Beijing, GUCAS
)

Sep 4, 2023

6 pages

Published in:

Phys.Rev.C 109 (2024) 1, L012201

Published: Jan 4, 2024

e-Print:

2309.01416 [hep-ph]

DOI:

10.1103/PhysRevC.109.L012201 (publication)

View in:

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Abstract: (APS)

In this study, we determine the mass radius of

{}^{4}{He}

, a very light nucleus, by examining the near-threshold

ϕ

-meson photoproduction data of the LEPS Collaboration. To assess the gravitational form factor of

{}^{4}{He}

, we employ multiple models for the mass distribution, including Yukawa-type, exponential, Gaussian, and uniform functions. The mass radius of

{}^{4}{He}

is measured to be

1.70 \pm 0.14

fm, which is approximately equal to the charge radius of

{}^{4}{He}

. Surprisingly, in contrast to the findings of the proton, no noticeable discrepancy between the charge radius and the mass radius is noted for the

{}^{4}{He}

nucleus. The proton and neutron distributions within

{}^{4}{He}

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.

Note:

6 pages, 3 figures

form factor: gravitation
vector meson: photoproduction
threshold: production
nucleus: target
light nucleus
dipole
charge radius
monopole
differential cross section

References(39)

Figures(3)

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