[en] A review of the current status on fusion reaction around Coulomb barrier is presented. The fusion l distribution measurements for ¹⁶O, ²⁸Si + ¹¹⁵In reactions using multielement BGO multiplicity setup is discussed in detail. The role of projectile deformation in enhancing the higher moments of the fusion l distribution around Coulomb barrier energies has been studied. (author). 26 refs., 5 figs

[en] The neutron induced compound nuclear cross sections are required for nuclear energy, national security and nuclear astrophysics applications. The renewed interest in nuclear energy has led to design of new reactor systems based on fast neutron induced fission. The transuranic nuclide produced in the nuclear fuel cycles by successive neutron capture, play prominent role in modeling processes that are relevant to generate energy. The fast-neutron induced reactions have also been proposed for the incineration of actinide materials, notably minor actinide isotopes which are produced in Th-U or U-Pu fuel cycles. Unfortunately, for a large number of reactions the relevant data cannot be directly measured in the laboratory, since the relevant nuclei are often too difficult to produce with currently available experimental techniques or too short-lived to serve as target in present day setups

[en] A brief outline of some of the recent experimental results and predictions of different theoretical models are discussed. Results of the measurements on fission fragment anisotropies in ¹⁰B, ¹¹B + ²³²Th reactions to investigate projectile ground state spin effect on fragment anisotropy at near and below barrier energies are also presented

[en] The effect of projectile structure on some aspects of heavy ion induced fusion and fusion-fission reaction dynamics will be presented. We discuss on representation of fusion barrier distribution extracted from large angle quasi-elastic scattering as an effective tool for investigating interplay of structure and dynamics in fusion reaction. Results on our investigation of projectile deformation and Coulomb reorientation effect on fusion barrier distribution in ¹⁶O + ¹¹⁵In and ²⁸Si + ¹¹⁵In reactions will be presented. We also discuss the effect of projectile structure in fusion-fission dynamics and the effect of projectile ground state spin on fission fragment anisotropies in ¹⁰B, ¹¹B + ²³²Th and ¹⁰B, ¹¹B + ²³⁷Np reactions. (author)

[en] Compound nuclear cross sections for reactions of neutrons and light charged particles with target nuclei across the isotopic chart, taking place at energies from several KeV to tens of MeV, are required for nuclear astrophysics, national security, and nuclear-energy applications. The trans-uranium nuclide produced in the nuclear fuel cycles by successive neutron capture, play prominent role in modeling processes that are relevant to generate energy. The fast-neutron induced reactions have also been proposed for the incineration of actinide materials, notably minor actinide isotopes which are produced in Th-U or U-Pu fuel cycles. Unfortunately, for a large number of reactions the relevant data cannot be directly measured in the laboratory, since the relevant nuclei are often too difficult to produce with currently available experimental techniques or too short-lived to serve as target in present day setups. The Surrogate reaction methods provide access to such nuclear data indirectly. In recent years, the surrogate reaction methods in various forms have been employed to get indirect estimate of the neutron induced fission reaction cross sections of many compound nuclear systems in actinide region, which are not accessible for direct experimental measurements. We have developed a new experimental technique known as hybrid surrogate ratio method and successfully employed to determine "2"3"3Pa(n,f), "2"3"4Pa(n,f), "2"3"9Np(n,f), and "2"4"0Np(n,f) compound nuclear cross sections in the equivalent neutron energy range 10.0 to 16.0 MeV by measuring the ratio of fission decay probabilities in ["2"3"2Th("6Li,α)"2"3"4Pa/ "2"3"2Th("6Li,d)"2"3"6U], ["2"3"2Th("7Li,α)"2"3"5Pa/ "2"3"2Th("7Li,t)"2"3"6U], ["2"3"8U("6Li,α)"2"4"0Np /"2"3"8U("6Li,d)"2"4"2Pu], and ["2"3"8U("7Li,α)"2"4"1Np / "2"3"8U("7Li,t)"2"4"2Pu] transfer reactions respectively. We have also determined "2"4"1Pu(n,f) cross section in the equivalent neutron energy range 11.0 MeV to 18.0 MeV using "2"3"8U("6Li,d)"2"4"2Pu and "2"3"2Th("6Li,d)"2"3"6U transfer reactions employing surrogate ratio method. In this talk, we start with a brief discussion on surrogate reaction methods and present some of the recent results on neutron induced fission cross section measurements carried out by our group and the possibility of extending the measurements for determining (n,γ), (n,2n) and (n,p) reaction cross-sections by surrogate reaction method will also be discussed. (author)

[en] A class of exact plane symmetric solutions of the Brans-Dicke vacuum field equations is obtained. This class, in the limit ω → infinity, is found to agree with Taub's (Ann. Math.; 53:472 (1951)) class of solutions. It has been observed that the non-static solution belonging to this class represents a plane-fronted wave. (author)

[en] A brief discussion of surrogate reaction methods has been made and some of the recent results on neutron induced fission cross section measurements have been presented. The validation of the EMPIRE-3.1. predictions on neutron induced cross sections corresponding to fission barriers used from Barrier Formula (BF) and RIPL-1 libraries have been discussed

[en] Providing reliable neutron induced compound nuclear cross section data for applications remains a formidable task, direct measurements have to be complemented by theoretical predictions and indirect methods. Surrogate nuclear reaction method, aims at determining cross sections for compound nuclear reactions on unstable targets by producing the compound nucleus via an alternative transfer reaction and observing the subsequent decay via particle evaporation or fission. Neutron induced fission cross section measurements for some of the unstable nuclei in U-Pu and Th-U fuel cycle and more recently (n,xp) cross sections for fusion reactor structural materials (⁵³Mn,⁵⁹Ni) by employing surrogate reaction method using ^6,7Li beams will be presented. Open questions and prospects will be considered. (author)

[en] It is shown that finding the solution of the Brans-Dicke field equations corresponding to a static spherically symmetric charged-dust distribution can be reduced to solving a generalized Schroedinger equation in one dimension

[en] A class of exact plane-symmetric interior solutions to the Brans-Dicke field equations has been presented for a physically reasonable equation of state