Effect of source size and emission time on the p–p momentum correlation function in the two-proton emission process

更新时间:2023-05-28

【摘要】The effect of source size and emission time on the proton-proton（p-p） momentum correlation function(Cpp（q）) has been studied systematically.Assuming a spherical Gaussian source with space and time profile according to the function S（r,t）～exp（-r2/2 r02-t/τ） in the correlation function calculation code（CRAB）,the results indicate that one Cpp（q） distribution corresponds to a unique combination of source size r0 and emission time τ.Considering the possible nuclear deformation from a spherical nucleus,an ellipsoidal Gaussian source characterized by the deformation parameter ∈=ΔR/R has been simulated.There is almost no difference of Cpp（q） between the results of spherically and ellipsoidally shaped sources with small deformation.These results indicate that a unique source size r0 and emission time could be extracted from the p-p momentum correlation function,which is especially important for identifying the mechanism of twoproton emission from proton-rich nuclei.Furthermore,considering the possible existence of cluster structures within a nucleus,the double Gaussian source is assumed.The results show that the p-p momentum correlation function for a source with or without cluster structures has large systematical differences with the variance of r0 and τ.This may provide a possible method for experimentally observing the cluster structures in proton-rich nuclei.

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