摘要
We study in the framework of the Langevin model the influence of initial excitation energy(E*) of Hg compound nuclei(CNs) on the sensitivity of the excitation energy at scission(Esc*) to the nuclear friction strength(β).It is shown that the sensitivity is enhanced substantially with increasing E*.Moreover,we find that the significant sensitivity of Esc* to β at high E*is little affected by a marked difference in the neutron-to-proton ratio of a CN and in its size and fissility.Our findings suggest that,on the experimental side,a measurement of Esc* in energetic proton-induced spallation reactions can provide not only a sensitive but also a robust probe of nuclear dissipation in fission of highly excited nuclei.Further development of a suitable approach to spallation reaction is discussed.
We study in the framework of the Langevin model the influence of initial excitation energy (E*) of Hg compound nuclei (CNs) on the sensitivity of the excitation energy at scission (E^c) to the nuclear friction strength (fl). It is shown that the sensitivity is enhanced substantially with increasing E*. Moreover, we find that the significant sensitivity of E*c to fl at high E* is little affected by a marked difference in the neutron-to-proton ratio ofa CN and in its size and fissility. Our findings suggest that, on the experimental side, a measurement of E^c in energetic proton-induced spallation reactions can provide not only a sensitive but also a robust probe of nuclear dissipation in fission of highly excited nuclei. Further development of a suitable approach to spallation reaction is discussed.
基金
Supported by National Natural Science Foundation of China(NSFC) Projects (No.11075034)