scholarly journals THE ISOSPIN DISTRIBUTION OF FRAGMENTS IN REACTIONS 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru, and 96Zr + 96Zr AT BEAM ENERGY 400 AMeV

2002 ◽  
Vol 17 (07) ◽  
pp. 375-385 ◽  
Author(s):  
QINGFENG LI ◽  
ZHUXIA LI

The isospin distribution of particles and fragments in collisions 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru and 96Zr + 96Zr at beam energy 400 AMeV is studied with isospin-dependent QMD model. We find that the rapidity distribution of differential neutron–proton counting in neutron rich nucleus–nucleus collisions at intermediate energies is sensitive to the isospin-dependent part of nuclear potential. The study of the N/Z ratio of nucleons, light charged particles (LCP) and intermediate mass fragments (IMF) shows that the isospin-dependent part of nuclear potential drives IMF to be more isospin symmetric and emitted nucleons to be more neutron rich. From the study of the time evolution of the isospin distribution in emitted nucleons, LCP and IMF we find that neutrons diffuse much faster than protons at the beginning and the final isospin distribution is a result of dynamical balance of symmetry potential and Coulomb force under the charge conservation.

The distributions in angle and energy for charged particles emitted from polycrystalline platinum bombarded with ions of hydrogen, sodium, potassium and some hydrocarbons, have been measured, in continuation of previous work (Cawthron, Cotterell & Oliphant 1969 a , b , parts I and II; 1970, part III) to lower energies. Composite spectra are presented, including ions of both signs. The flux of emitted charged particles, under hydrogen ion bombardment, is shown to contain approximately equal numbers of protons and H¯ ions, except at the lowest bombarding energies, where the latter apparently predominate. Scattering in all cases is shown to increase with bombarding energy over the range covered, the increase being near linear for hydrogen and very rapid for alkalimetal ions. In all cases the total emission of charged particles is very small at the lowest bombarding energies employed.


1993 ◽  
Vol 346 (4) ◽  
pp. 293-296 ◽  
Author(s):  
A. Badala ◽  
R. Barbera ◽  
A. Palmeri ◽  
G. S. Pappalardo ◽  
F. Riggi ◽  
...  

1996 ◽  
Vol 355 (1) ◽  
pp. 35-39 ◽  
Author(s):  
F. Lucarelli ◽  
N. Gelli ◽  
P. Blasi ◽  
M. Cinausero ◽  
E. Fioretto ◽  
...  

2017 ◽  
Vol 146 ◽  
pp. 04058
Author(s):  
Vincent Métivier ◽  
Charlotte Duchemin ◽  
Arnaud Guertin ◽  
Nathalie Michel ◽  
Férid Haddad

1995 ◽  
Vol 51 (6) ◽  
pp. 3492-3495 ◽  
Author(s):  
L. Beaulieu ◽  
M. Samri ◽  
B. Djerroud ◽  
G. Auger ◽  
G. C. Ball ◽  
...  

2005 ◽  
Vol 14 (02) ◽  
pp. 239-254
Author(s):  
L. AUDITORE ◽  
R. BARNÁ ◽  
D. DE PASQUALE ◽  
A. ITALIANO ◽  
A. TRIFIRÓ ◽  
...  

We study the 16 O +58 Ni deep inelastic reaction by using coincident charged techniques. Inclusive as well as exclusive data of the C , N , and O fully-damped fragments and their associated light charged particles ( p , d , t , and α-particles) have been collected at the IReS Strasbourg VIVITRON Tandem facility. The velocity distributions of the emitted protons and the associated multiplicity polar plots are analyzed by means of a model which describes simultaneously the nonequilibrium and the evaporative (equilibrated) components of a deep inelastic reaction mechanism. Estimates on polarization phenomena as well as the associated "decay times" of the reaction have been obtained. The hypothesis of a new "fan effect" is proposed for the proton sequential emission in the deep inelastic scattering of 16 O +58 Ni at 8.25 MeV/nucleon.


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