Aleksandra Kelić

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The production of light and intermediate-mass nuclides formed in the reaction 1 H+ 238 U at 1 GeV was measured at the Fragment Separator (FRS) at GSI, Darmstadt. The experiment was performed in inverse kinematics, shooting a 1 A GeV 238 U beam on a thin liquid-hydrogen target. 254 isotopes of all elements in the range 7≤Z≤37 were unambiguously identified,(More)
A new experimental approach is introduced to investigate the relaxation of the nuclear deformation degrees of freedom. Highly excited fissioning systems with compact shapes and low angular momenta are produced in peripheral relativistic heavy-ion collisions. Both fission fragments are identified in atomic number. Fission cross sections and fission-fragment(More)
Using available experimental data on fission barriers and ground-state masses, a detailed study of the predictions of different models concerning the isospin dependence of saddle-point masses is performed. Evidence is found that several macroscopic models yield unrealistic saddle-point masses for very neutron-rich nuclei, which are relevant for the(More)
As background experiments for the measurement of the spallation and fission products of uranium and lead, the reactions 238 U on lead, 238 U on titanium, 208 Pb on titanium at 1 A GeV, and 208 Pb on titanium at 0,5 A GeV were investigated in inverse kinematics at the Fragment Separator (FRS) at GSI. The use of the FRS, a high-resolution forward magnetic(More)
Comparing observational abundance features with nucleosynthesis predictions of stellar evolution or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the quality of the nuclear physics input utilized. We test the abundance features of r-process nucleosynthesis calculations for the dynamical(More)
Precise momentum distributions of identified projectile fragments, formed in the reactions 238U+Pb and 238U+Ti at 1A GeV, are measured with a high-resolution magnetic spectrometer. With increasing mass loss, the velocities first decrease as expected from previously established systematics, then level off, and finally increase again. Light fragments are on(More)
We report on a novel experimental approach for studying the dissipative spreading of collective motion in a metastable nuclear system, using, for the first time, highly fissile nuclei with spherical shape. This was achieved by fragmentation of 45 radioactive heavy-ion beams at GSI, Darmstadt. The use of inverse kinematics and a dedicated experimental setup(More)
Heavy neutron-rich nuclei were populated via the fragmentation of a E/A = 1 GeV P 208 82 b beam. Secondary fragments were separated and identified, and subsequently implanted in a passive stopper. By the detection of delayed gamma rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority(More)