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The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV for the first time. No clear resonancelike behavior is observed in the excitation function for W γd = 2.38-2.61 GeV, where the d * (2380) dibaryon resonance observed at COSY is expected to appear. The measured excitation function is consistent with the existing theoretical calculation for this reaction. The upper limit of the total cross section is found to be 0.034 µb for the dibaryon resonance at W γd = 2.37 GeV (90% confidence level) in the γd → π 0 π 0 d reaction.

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Abstract:We have developed an event mixing technique to observe Bose-Einstein correlations (BEC) between two identical neutral pions produced in photo-induced reactions in the non-perturbative QCD energy region. It is found that the missing-mass consistency cut and the pion-energy cut are essential for the event mixing method to effectively extract BEC observables. A Monte Carlo (MC) simulation is used to validate these constraints and confirms the efficiency of this method. Our work paves the way for similar BEC studies at lower energies where the multiplicity of emitted bosons is limited.

Water/ice identification images throughout the thawing process of ice in a metal capillary by using a pulsed neutron source.

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