Deuteron

The τ-deuteron is the simplest non-trivial nuclear bundle: a single proton + single neutron bound on T² × R³ via the strong sector. It is the unique stable two-nucleon T² composite — the diproton and dineutron are unbound — and the gateway from single-defect particles (PG-P01-neutron) to multi-defect nuclei (PG-O02-alpha-particle).

Categorical invariant. Two-defect-bundle composite (one τ-proton + one τ-neutron) on T² × R³ whose stability requires the strong sector and breaks the proton-proton/neutron-neutron channels.

Primary registry anchor: IV.D528

Supporting items: IV.P166, IV.P330, IV.T254

1. I.K0 — Universe Postulate
2. IV.D12 — Particle Kind on T² fiber
3. IV.P166 — Neutron Minimality
4. IV.P330 — Quark composition: n = udd, p = uud
5. IV.D528 — Nuclear Structure as multi-defect bundle template
6. IV.T254 — Dual Magic Number Structure governs nuclear T²-shell binding

Numerical value: 3.3435837724e-27 ± 1.0e-36 kg

Calibration anchor: PG-P01-neutron

Calibration chain:

1. m_n (anchor)
2. m_p via IV.T142
3. B_d ≈ 2.224 MeV via strong-sector T²-binding
4. m_d = m_p + m_n − B_d/c² recovered in SI

Manuscript reference: manuscript-sources/book-04/part05/ch40-light-nuclei.tex

Status: Planned

Related glossary entries

• PG-P01-neutron τ-Neutron
• PG-Q01-mass Mass
• PG-O02-alpha-particle α-Particle (Helium-4 Nucleus)

Referenced by

• PG-O04-atomic-nucleus Atomic Nucleus