Radiative proton capture on (6)He

Area of Science:

• Nuclear Physics
• Quantum Mechanics
• Astrophysics

Background:

• Investigating nuclear clustering is crucial for understanding nuclei far from stability.
• Halo nuclei, with their loosely bound nucleons, present unique opportunities to study nuclear structure.
• Radiative capture reactions provide a sensitive tool to probe these structures.

Purpose of the Study:

• To utilize proton radiative capture as a method to investigate nuclear clustering.
• To perform the first measurement of proton radiative capture on a halo nucleus, specifically Helium-6.
• To analyze the reaction products and energy distributions to infer information about nuclear clustering.

Main Methods:

• The experiment involved a 40 MeV proton beam impinging on a Helium-6 target.
• Detection of gamma rays and reaction products to identify capture channels.
• Analysis of event data to distinguish between direct capture, quasifree capture, and capture into the continuum.

Main Results:

• The strongest observed channel was the radiative capture of protons leading to the formation of Lithium-7.
• Events consistent with quasifree capture on a halo neutron, the alpha core, and Helium-5 were recorded.
• The data suggests the potential for describing some events through capture into the continuum of Lithium-7.

Conclusions:

• Proton radiative capture is a viable method for probing clustering in halo nuclei.
• The Helium-6(p,gamma) reaction provides insights into the cluster structure of Helium-6 and the formation of Lithium-7.
• Further theoretical analysis is needed to fully interpret the quasifree capture events and continuum contributions.