$Nd\to{^3H}γ$ with Effective Field Theory

The cross section of neutron-deuteron radiative capture $n d\to {^3H}γ$ is calculated at energies relevant to Big-Bang nucleosynthesis ($20 \leq E \leq 200$ Kev) with pionless Effective Field Theory. At these energies, magnetic transition M1 gives the dominant contribution. The M1 amplitude is calculated up to next-to-next-to leading order(N$^2$LO) with insertion of three-body force. Results are in good agreement within few percent theoretical uncertainty in comparison with available calculated data below E=200 Kev.

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