Unit:
Κατεύθυνση Χημεία-ΦυσικοχημείαLibrary of the School of Science
Supervisors info:
Γεώργιος Α. Σουλιώτης, Αναπληρωτής καθηγητής, Τμήμα Χημείας, Σχολή Θετικών Επιστημών, ΕΚΠΑ.
Original Title:
Μελέτη ενεργών διατομών και γωνικακών κατανομών ισοτόπων πλούσιων σε νετρόνια από αντιδράσεις σε ενέργεια 15 MeV/νουκλεόνιο
Translated title:
Study of cross sections and angular distributions of neutron rich isotopes from reactions at 15 MeV/nucleon
Summary:
In this work, recent efforts to study the production cross-sections as well as the angular distributions, of neutron-rich isotopes from the interaction of a 86Kr beam at 15MeV/nucleon with targets of 64Ni and 124Sn are presented. Experimental data on the differential cross sections at two angles (4 and 7 degrees) were obtained from the previous work of our group with the MARS spectrometer at the Cyclotron Institute of Texas A&M University. The experimental data are compared with model calculations based on a two-step approach in which the dynamical stage of the collision is described with either the phenomenological Deep-Inelastic Transfer model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The de-excitation of the hot heavy projectile-like fragments is performed with the Statistical Multifragmentation Model (SMM). The calculations provide an overall fair description of the experimental data and indicate further improvements and extensions in the models.
We also calculated and compared production cross sections of neutron-rich nuclides from collisions of the stable 86Kr beam and the radioactive 92Kr beam (15MeV/nucleon) with targets of 124Sn and 238U, and we demonstrate that the multinucleon transfer mechanism leads to extremely neutron-rich nuclides in the mass region of A∼90-120, toward and beyond the astrophysical r-process path. In the near future, we wish to experimentally investigate such reactions with the MAGNEX spectrometer at LNS/INFN, Catania, and with the KOBRA spectrometer at RISP/IBS, Korea. In conjunction with our recent work our continued progress in the study of multinucleon transfer reactions using heavy-ion beams at 15MeV/nucleon, combined with the enhanced capabilities of present and upcoming low-energy accelerator facilities worldwide, enable new opportunities in the neutron-rich rare isotope research and may effectively contribute to the study of the r-process.
Main subject category:
Science
Keywords:
Heavy ion nuclear reactions, deep inelastic collisions, constrained molecular dynamics, cross section, radioactive beams, neutron drip-line.
