Nuclei with a Heavy Guest express

Original: "Possible Existence of $$^3_\phi$$H, $$^4_\phi$$H, $$^4_\phi$$He, and $$^5_\phi$$He Nuclei"

· Rimantas Lazauskas, Roman Ya. Kezerashvili, Igor Filikhin

arXiv:2601.14572 · 2026-01-21 · CC BY 4.0 · 1 min

Physicists calculated how short-range attraction between a phi meson and nucleons binds them into tiny nuclei.

The phi meson is a particle that lives only for an instant, but it can briefly stick to protons and neutrons in an atomic nucleus. Physicists have studied what happens if such a meson finds itself inside light nuclei of helium and hydrogen.

Using forces calculated from first principles (that is, without adjustable parameters), the authors solved equations for systems consisting of a phi meson and three or four nucleons. It turned out that the attraction between the phi meson and nucleons at short distances is strong enough to hold them together.

The attraction is like Velcro: it only works when things are in direct contact, but then it holds very firmly.

As a result, bound states form: phi-meson nuclei of helium-4, helium-5, and hydrogen-4. If the interaction depends on spin, the binding is deep; if not, it is moderate. Including the electric charge shifts the binding energies slightly.

Such exotic nuclei could be produced in high-energy particle collisions. Studying them helps us understand how strange quarks behave inside nuclear matter.

The phi meson consists of a strange quark and its antiquark, so its 'sticking' to an ordinary nucleus is a way to peek into the world of strangeness.

Scientists

Albert Einstein Hans Bethe Lise Meitner Margaret Burbidge Fred Hoyle Ralph Alpher

Concepts

nucleosynthesis mass–energy equivalence triple-alpha process (Hoyle process)

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Nuclei with a Heavy Guest express