Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (5): 52 doi: 10.1007/s41365-020-00759-w


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

Long Zhou1, 2 , De-Qing Fang 3,1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    University of Chinese Academy of Sciences, Beijing 100049, China
    Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China
  • Received:2020-02-16 Revised:2020-03-06 Accepted:2020-03-11
  • Contact: De-Qing Fang
  • Supported by:
    This work is partially supported by the National Key R&D Program of China (No. 2018YFA0404404), the National Natural Science Foundation of China (Nos. 11925502, 11935001, 11961141003, 11421505, 11475244, and 11927901), the Shanghai Development Foundation for Science and Technology (No. 19ZR1403100), the Strategic Priority Research Program of the CAS (No. XDPB09), and the Key Research Program of Frontier Sciences of the CAS (No. QYZDJ-SSW-SLH002).
PDF ShareIt Export Citation
Long Zhou, De-Qing Fang. Effect of source size and emission time on the p-p momentum correlation function in the two-proton emission process.Nuclear Science and Techniques, 2020, 31(5): 52     doi: 10.1007/s41365-020-00759-w

Abstract: 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( r2/2r20 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  = ∆R/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 two-proton 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.

Key words: Two-proton emission, p-p momentum correlation function, Source size, Emission time