Direct proton transfer on 46Ar supports the presence of a charge density bubble linked to a novel nuclear structure below 48Ca
Abstract
The 46Ar(3He,d)47K reaction was performed in inverse kinematics using a radioactive 46Ar beam produced by the SPIRAL1 facility at GANIL and a cryogenic 3He target. The AGATA-MUGAST-VAMOS setup allowed the coincident measurement of the γ rays, deuterons and recoiling 47K isotopes produced by the reaction. The relative cross sections towards the proton-addition states in 47K point towards a depletion of the π s1/2 shell. The experimental findings are in good agreement with ab initio calculations, which predict that 46Ar exhibits a charge density bubble associated with a pronounced proton closed-shell character.
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