119164485
Isospin effects in the disappearance of flow as a function of colliding geometry
We study the effect of isospin degree of freedom on the balance energy (E{sub bal}) as well as its mass dependence throughout the mass range 48-270 for two sets of isobaric systems with N/Z=1 and 1.4 at different colliding geometries ranging from central to peripheral ones. Our findings reveal the dominance of Coulomb repulsion in isospin effects on E{sub bal} as well as its mass dependence throughout the range of the colliding geometry. Our results also indicate that the effect of symmetry energy and nucleon-nucleon cross section on E{sub bal} is uniform throughout the mass range and throughout the colliding geometry. We also present the counterbalancing of nucleon-nucleon collisions and mean field by reducing the Coulomb and the counterbalancing of Coulomb and mean field by removing the nucleon-nucleon collisions.
119117570
Study of participant-spectator matter and thermalization in isospin asymmetric systems
We study the behavior of participant and spectator matter and thermalization in neutron rich systems at the energy of vanishing flow. Our study indicates that participant-spectator matter follows a similar behavior for neutron-rich systems and for systems lie on the stability line.
118386846
Collective flow and balance energy in asymmetric heavy-ion collisions
Heavy-ion collisions at intermediate energy provide a useful tool to determine the nuclear matter equation of state as well as in-medium nucleon-nucleon (nn) cross-section. One of the most promising phenomena that can be helpful in this context is the disappearance of transverse in-plane flow. At low incident energies, the dominance of attractive interactions results in the emission of particles into backward hemisphere which leads to negative transverse in-plane flow whereas at higher incident energies, the particles are emitted into forward hemisphere resulting in positive flow. As one goes from low incident energy to higher one there exist a particular energy at which the net transverse in-plane flow disappears. This energy is termed as the energy of vanishing flow (EVF) [1, 2]. Up to now, one has measured the energy of vanishing flow in the reactions of C+C, Ne+Al, Ar+Al, Ar+Al, Ar+Sc, Ar+V, Zn+Al, Ar+Ni, Zn+Ti, Ni+Ni, Fe+Fe, Zn+Ni, Kr+Nb, Nb+Nb, Xe+Sn, La+La, and Au+Au [3]. However most of the reactions studied are nearly symmetric. Since, the dynamics of heavy-ion reactions also depends on asymmetry of the reaction [4]. We therefore, aim to study the transverse in-plane flow as well as its disappearance for different colliding nuclei with varying asymmetry. We plan to address this question using quantum molecular dynamics (QMD) model [5].
115690807
On the study of momentum correlations in fragmentation in heavy-ion collisions
The role of momentum correlations in fragmentation is studied within the framework of quantum molecular dynamics model. Our study is carried out by imposing momentum cut in the clusterization algorithm. The study reveals a strong effect of momentum cut in the fragmentation pattern. A comparison with experimental data is also presented. Our theoretical results are in agreement with the experimental data.
64603470
Dependence of balance energy on isospin degrees of freedom
Using the isospin-dependent quantum molecular dynamics model we study the isospin effects on the disappearance of flow for the reactions of 58Ni+58Ni and 58Fe+58Fe as a function of impact parameter. We found good agreement between our calculations and experimentally measured energy of vanishing flow at all colliding geometries. Our calculations reproduce the experimental data within 5%(10%) at central (peripheral) colliding geometries.
55890103
Phase-space analysis of fragments formed in heavy-ion collisions
We study the effect of momentum-dependent interactions and a broader Gaussian on multifragmentation. We also look into the details of the fragment structure for a broader Gaussian and momentum-dependent interactions. We find that nucleons forming the fragments belong to the same region of the phase space.
121399825
Interaction between classical and quantum systems: A new approach to quantum measurement. III. Illustration
Following the approach to quantum measurement, proposed in an earlier paper, in which the apparatus is treated as a purely classical instrument to be described by the laws of classical mechanics we examine some simple experiments for the purpose of illustration. The Stern-Gerlach experiment is examined in detail, within our approach, and we see explicitly how the relevant information is transferred to the apparatus variables. We also examine a magnetic interferometer arrangement and a crossed-field arrangement. Consideration of these experiments leads us to the inclusion of an extra procedural step in our approach. This extra step is necessary so that an observer may measure the classical apparatus variables at will after the interaction is completed.
116787068
An Approach to Measurement in Quantum Mechanics
We consider an unconventional approach to the measurement problem in quantum mechanics — we treat the apparatus as a classical system, belonging to the macro-world.