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Search Results: 1 - 10 of 1366 matches for " Rajeev Puri "
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The role of surface energy coefficients and nuclear surface diffuseness in the fusion of heavy-ions
Ishwar Dutt,Rajeev K. Puri
Physics , 2010, DOI: 10.1103/PhysRevC.81.047601
Abstract: We discuss the effect of surface energy coefficients as well as nuclear surface diffuseness in the proximity potential and ultimately in the fusion of heavy-ions. Here we employ different versions of surface energy coefficients. Our analysis reveals that these technical parameters can influence the fusion barriers by a significant amount. A best set of these parameters is also given that explains the experimental data nicely.
A systematic study of the fusion barriers using different proximity type potentials for $N = Z$ colliding nuclei : New extensions
Ishwar Dutt,Rajeev K. Puri
Physics , 2010, DOI: 10.1103/PhysRevC.81.044615
Abstract: By using 14 different versions and parametrizations of a proximity potential and two new versions of the potential proposed in this paper, we perform a comparative study of fusion barriers by studying 26 symmetric reactions. The mass asymmetry $\eta_{A}$ = $(\frac{A_{2}-A_{1}}{A_{2}+A_{1}}),$ however, is very large. Our detailed investigation reveals that most of the proximity potentials reproduce experimental data within $\pm$8% on the average. A comparison of fusion cross sections indicates that Bass 80, AW 95, and Denisov DP potentials have a better edge than other potentials. We also propose new versions of the proximity potential as well as Denisov parametrized potential. These new versions improve the agreement with the data.
Analytical parametrization of fusion barriers using proximity potentials
Ishwar Dutt,Rajeev K. Puri
Physics , 2010, DOI: 10.1103/PhysRevC.81.064608
Abstract: Using the three versions of proximity potentials, namely proximity 1977, proximity 1988, and proximity 2000, we present a pocket formula for fusion barrier heights and positions. This was achieved by analyzing as many as 400 reactions with mass between 15 and 296. Our parametrized formula can reproduced the exact barrier heights and positions within an accuracy of $\pm1%$. A comparison with the experimental data is also in good agreement.
Comparison of different proximity potentials for asymmetric colliding nuclei
Ishwar Dutt,Rajeev K. Puri
Physics , 2010, DOI: 10.1103/PhysRevC.81.064609
Abstract: Using the different versions of phenomenological proximity potential as well as other parametrizations within the proximity concept, we perform a detailed comparative study of fusion barriers for asymmetric colliding nuclei with asymmetry parameter as high as 0.23. In all, 12 different proximity potentials are robust against the experimental data of 60 reactions. Our detailed study reveals that the surface energy coefficient as well as radius of the colliding nuclei depend significantly on the asymmetry parameter. All models are able to explain the fusion barrier heights within $\pm10%$ on the average. The potentials due to Bass 80, AW 95, and Denisov DP explain nicely the fusion cross sections at above- as well as below-barrier energies.
On the balance energy and nuclear dynamics in peripheral heavy-ion collisions
Rajiv Chugh,Rajeev K. Puri
Physics , 2010, DOI: 10.1142/S0218301310016478
Abstract: We present here the system size dependence of balance energy for semi-central and peripheral collisions using quantum molecular dynamics model. For this study, the reactions of $Ne^{20}+Ne^{20}$, $Ca^{40}+Ca^{40}$, $Ni^{58}+Ni^{58}$, $Nb^{93}+Nb^{93}$, $Xe^{131}+Xe^{131}$ and $Au^{197}+Au^{197}$ are simulated at different incident energies and impact parameters. A hard equation of state along with nucleon-nucleon cross-sections between 40 - 55 mb explains the data nicely. Interestingly, balance energy follows a power law $\propto{A^{\tau}}$ for the mass dependence at all colliding geometries. The power factor $\tau$ is close to -1/3 in central collisions whereas it is -2/3 for peripheral collisions suggesting stronger system size dependence at peripheral geometries. This also suggests that in the absence of momentum dependent interactions, Coulomb's interaction plays an exceedingly significant role. These results are further analyzed for nuclear dynamics at the balance point.
Influence of the Range of Interaction on the Stability of the Nucleus propagating with Momentum Dependent Interactions
Supriya Goyal,Rajeev K. Puri
Physics , 2011,
Abstract: Influence of the Range of Interaction on the Stability of the Nucleus propagating with Momentum Dependent Interactions.
On the energy of vanishing flow for colliding nuclei leading to same compound nucleus
Supriya Goyal,Rajeev K. Puri
Physics , 2011,
Abstract: Our present studies has shown that the mass dependence of EVF show mass asymmetry independent behaviour. This is due the fact that with increase in asymmetry, the number of nucleon-nucleon collisions and repulsive Coulomb interactions decreases, therefore EVF increases. The increase in EVF with asymmetry is more for lighter nuclei as compared to heavier nuclei due to the further less magnitude of Coulomb repulsions in lighter nuclei as compared to heavier ones.
Study of formation of stable fragments in central heavy-ion collisions
Supriya Goyal,Rajeev K. Puri
Physics , 2011,
Abstract: We study the stability of fragments using microscopic binding energy criteria in heavy-ion collisions.
Analysis of Gaussian width of nucleons in semi-classical model
Supriya Goyal,Rajeev K. Puri
Physics , 2011,
Abstract: In the present study we find that nuclei having double width do not emit free nucleons for a long period of time necessary to study heavy-ion collisions. Also, the ground state properties of all the nuclei are also described well. In the low mass region, the obtained nuclei are less bound but stable. Heavy mass nuclei have proper binding energy and are stable
Transverse in-plane flow: a new probe of symmetry energy in Fermi energy region
Sakshi Gautam,Rajeev K. Puri
Physics , 2011,
Abstract: We study the sensitivity of transverse flow towards the different density dependence of symmetry energy in Fermi energy region. Our results show that transverse flow shows sensitivity to different density dependence of symmetry energy. The mechanism for sensitivity towards different density dependence of symmetry energy is also discussed.
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