Unit:
Κατεύθυνση ΦυσικοχημείαLibrary of the School of Science
Author:
Ασημακοπούλου Αγγελική
Supervisors info:
Γεώργιος Σουλιώτης Αναπλ. Καθηγητής ΕΚΠΑ
Original Title:
Πλήρης δυναμική περιγραφή της αντιδράσεως θρυμματισμού (spallation) που επάγεται από πρωτόνιο υψηλής ενέργειας με τη χρήση του μοντέλου CoMD (Constrained Molecular Dynamics)
Translated title:
Full dynamic description of spallation reaction induced by high energy proton with the CoMD (Constrained Molecular Dynamics) model
Summary:
This thesis is a contribution to the study of proton – induced spallation
reactions on 238U, 208Pb, 181Taand197Auat intermediate and high excitation
energies. Proton-induced fission cross sections were calculated using the CoMD
model. It is a microscopic theoretical model, which describes the full dynamics
of the process. The code implements an effective interaction with a
nuclear-matter compressibility of K=200 (soft EOS) with several forms of the
density-dependence of the nucleon symmetry potential. In addition, CoMD imposes
a constraint in the phase space occupation for each nucleon, restoring the
Pauli principle at each time step of the collision. Proper choice of the
surface parameters of the effective interaction has been made to describe
fission. A comparison of ourcalculations with available experimental data from
the literature showed satisfactory agreement. It appears that the microscopic
code CoMD is able to describe the complicated N-body dynamics of the
fission/spallation process. The calculations of cross sections and the ratio of
fission to residue cross section as a function of the proton energy gave us the
opportunity to give estimates for unmeasured nuclides.
Keywords:
Spallation, Cross section, Spallation neutrons, ATW, ADS
Number of index pages:
1-9
