Absolute measurement of the GANIL beam energy

Abstract The energy of the GANIL cyclotron beam was measured on-line during the 208 Pb + 208 Pb elastic scattering experiment “Search for Color van der Waals Force in the 208 Pb + 208 Pb Mott scattering” with an absolute precision of 7 × 10 −5 at ∼ 1.0 GeV, which represents an improvement of one order of magnitude over previous absolute energy measurements. The energy was deduced from the time of flight between two beam-scanners, which only partially intercept the beam, situated on a straight line and separated by ∼ 48.0 m. It was found that the nominal beam energy was in good agreement with the present results.