Calculations in the impulse approximation indicate that radiative Bhabha scattering at BESIII could produce tens of thousands of γn → π⁻p events on deuteron and beryllium targets, enabling precise neutron momentum distribution measurements.
Electromagnetic transition from the 4$^+$ to 2$^+$ resonance in $^8$Be measured via the radiative capture in $^4$He+$^4$He
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abstract
An earlier measurement on the 4$^+$ to 2$^+$ radiative transition in $^8$Be provided the first electromagnetic signature of its dumbbell-like shape. However, the large uncertainty in the measured cross section does not allow a stringent test of nuclear structure models. The present paper reports a more elaborate and precise measurement for this transition, via the radiative capture in the $^4$He+$^4$He reaction, improving the accuracy by about a factor of three. The {\it ab initio} calculations of the radiative transition strength with improved three-nucleon forces are also presented. The experimental results are compared with the predictions of the alpha cluster model and {\it ab initio} calculations.
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Exploring the neutron momentum distribution in nuclei through $\gamma n \to \pi^- p$ at an electron-positron collider
Calculations in the impulse approximation indicate that radiative Bhabha scattering at BESIII could produce tens of thousands of γn → π⁻p events on deuteron and beryllium targets, enabling precise neutron momentum distribution measurements.