Radiative 3He-alpha reaction in Halo Effective Field Theory

Understand

In this work we study the radiative capture of ${\rm {}^3He}$ on ${\rm {}^4He}$ within the halo effective field theory (EFT) framework.

• At leading order the capture amplitude comprises the initial state $s$-wave strong and Coulomb interactions summed to all orders.
• At the same order in the expansion, leading two-body currents contribute as well.
• We find delicate cancelations between the various contributions, and the two-body current contributions can be replaced by appropriately enhancing the asymptotic normalizations of the $^7$Be ground and first excited state wave functions.