Abstract
The d-t collisions have a minor reaction branch, of the order of 10−5, involving γ emission from the incident
state with the spin of 3/2+ to the final 3/2− and 1/2− states of the α-n system. Standard E1 treatment of such a
transition results in zero cross sections because of the spin conservation rule. For this reason, the first theoretical
work on d + t → α + n + γ [Phys. Rev. C 110, 014612 (2024)], described the E1 transition as coming from
the high-energy d-wave spin-1/2 state of the α-n partition of 5
He, coupled to the d-t component by tensor
interaction. However, the exact E1 operator contains a contribution from the usually neglected magnetization
current, represented by the nucleon spin operators, which can allow the E1 d + t → α + n + γ transition to
occur without passing via the d-wave spin-1/2 α-n channel. The present paper studies the magnetization-currentinduced E1 transition using several potential models of the d-t interaction. It was found that the strength of
this transition depends strongly on the choice of the d-t interaction model. With the optical folding potential,
correctly capturing the deuteron extended structure, this contribution is suppressed by three orders of magnitude,
thus validating its neglect in the previous work