[en] A chemical separation method based on reversed-phase chromatography has been developed to separate the group five elements from the reaction products produced in the bombardment of ²⁴³Am with ⁴⁸Ca ions. Decontamination factors on the order of 10⁶ were achieved for group-three elements such as americium, and 10⁷ or more for selected reaction products as measured by gamma-ray spectrometry pre- and post-chemistry. Details of the chemical separation scheme are discussed and compared to previously reported results. (author)

No abstract available

[en] The production and study of superheavy elements is an important area of research in contemporary experimental nuclear physics. The heaviest element produced so far is Z=118 (one isotope with A=294) in the ⁴⁸Ca + ²⁴⁹Cf reaction with a production cross-section of 0.5 pico barns. Here we propose ²⁵⁰Cm(⁴⁸Ca, xn) and ^250-252Cf(⁴⁸Ca, xn) reactions for the synthesis of heavier isotopes of Z=116 and 118 with comparable theoretical production cross-sections. ²⁵⁰Cm, ²⁵⁰Cf, ²⁵¹Cf and ²⁵²Cf are feasible targets with half lives of 8300, 13.1, 898 and 2.6 years respectively

[en] The results of a detailed analysis performed on the data obtained in the ²⁴⁹Cf + ⁴⁸Ca bombardment is presented. This analysis is independent of the original data analysis performed in Dubna in which two possible decay chains were found. The first decay chain consisted of an evaporation residue implantation followed by two alpha decays and then a spontaneous fission. The second decay chain consisted of an evaporation residue implantation followed by an immediate spontaneous fission event. This analysis confirms that the two interesting events are present in the data. A summary of the two events will be given as well as a description of the analysis performed

No abstract available

[en] The emission of intermediate mass fragments (IMFs) emitted in peripheral to mid peripheral collisions of "4"8Ca on "1"1"2","1"2"4Sn targets at 45 A MeV has been studied. Kinematic evidence is provided for their dominant origin in a dynamic process, in which a transiently formed neck between projectile and target like fragments snaps quasi simultaneously in 2, 3 or 4 locations. This leads to aligned multi-chance fission-like process. Variations of the isotopic properties of these IMFs with the target A/Z ratio exhibit isoscaling-type behavior indicative of n/p mixing in the neck region. Relative probabilities are also consistent with ground state masses. (author)

[en] The synthesis of super heavy nuclei has received remarkable attention in recent years with the advancement of modern accelerators and suitable detectors. The heaviest element 118 was synthesized with the cross section of about 1 pb in fusion of ⁴⁸Ca with heaviest available target of ²⁴⁹Cf. Future progress for synthesis of super heavy element Z > 118 is going on, especially for the element Z = 120. To produce composite systems, two distinct nuclei must unite during the reaction known as fusion. When the incident energy is not very high and the system is not very light, i.e quantum tunneling over the Coulomb barrier, it is formed by the strong cancelling of the repellent Coulomb force and the attracting nuclear interaction. The relative velocity of the colliding nuclei is highly impacted by couplings to many nuclear intrinsic motions at energies close and below the Coulomb barrier. It is found that the life time of the produced isotopes decreases with increase in mass number of the projectile. The super heavy elements like Z=114-118 are synthesized with different projectile and actinide as a target. There are projectiles such as ⁴⁶Ti, ⁵⁴Cr, ⁶⁴Ni which can be used to synthesized super-heavy elements i.e, Z>118. Here we used ⁴⁶Ti as a projectile and ²⁵²Cf as a target to produce Z=120

[en] In heavy ion induced fusion reaction the first stage is the capture of the projectile in the entrance channel. Apart from the classical Newtonian evaluation, fluctuation-dissipation plays an important role in the process of capture. Before embarking into the full stochastic dynamics here we tested the deterministic part of the dynamics using Langevin equations

[en] In the present study, it is proposed N/Z dependence of Ebal as a probe of symmetry energy and its density dependence. The present study is carried within the framework of isospin-dependent quantum molecular dynamics (IQMD) model

[en] Searches for superheavy elements in terrestrial and meteoritic samples have been carried out using very sensitive neutron detectors. In samples of three meteorites a spontaneous fission activity has been detected, which may be explained as being due to the presence of a new spontaneously nuclide therein. This nuclide is likely to be a superheavy element whose concentration in the samples investigated is about 10^-14 g/g. Similar results have been obtained from other studies in which geothermal water rich in heavy metals was passed through anion-exchange resin to investigate the spontaneous fission activity of the latter. The average number of prompt spontaneous fission neutrons is estimated to be about 4. Possible methods of identifying this activity are considered. The results of experiments to synthesize superheavy elements by ⁴⁸Ca ion-induced reactions are under discussion. The investigation has been performed at the Laboratory of Nuclear Reactions, JINR. (author)