[en] A particularly interesting scenario occurs when the occupation of shape driving orbital at the Fermi surface removes axial symmetry and forces the nucleus to adopt a triaxial shape. Interesting feature of this mass region is the existence of regular M1 bands which have been considered to be a promising candidates of magnetic rotation. In several nuclei of the A ∼ 130 mass region M1 bands are known. In the present work, the phenomena in ¹³¹Ba is studied

[en] In the present work high spin states of ¹⁴⁰Sm have been populated through the ¹¹⁶Cd(²⁸Si,4n)¹⁴⁰Sm heavy ion fusion evaporation reaction at beam energy of 128.7 MeV provided by Pelletron Linac at TIFR, Mumbai. Target used in experiment was 1 mg/cm²¹¹⁶Cd on 6 mg/cm² gold backing. Compound nucleus recoil velocity was 1.9% velocity of light and recoil energy was 25 MeV. Indian National Gamma Array (INGA) consisting of nineteen Compton suppressed Clover detectors at angle of -23°, -40°, -65°, 90°, 65°, 40°, 23° were used to detect de-exciting gamma rays. Two and higher fold gamma-gamma coincidence list mode data were recorded in a fast digital data acquisition system based on Pixie-16 modules of XIA LLC. The data sorting routine MARCOS, developed at TIFR, sorts the time stamped data to generate Eγ - Eγ matrix and Eγ-Eγ-Eγ cube

[en] Particle induced X-ray emission (PIXE) is one of the most widely used ion beam techniques for the elemental analysis of solid materials. Simultaneous multi-element detection, non-destructive nature and sensitivity to mid and high Z elements down to trace levels are some of its attractive features. This paper presents the theoretical modelling of proton induced ionisation cross sections of the different levels of such toxic elements as As, Hg and Pb. The cross-sections are calculated in 0.5 - 2.5 MeV proton energy region by ISICS software. It is observed that the ionisation cross-sections increase with the increase in beam energy implying that the X-ray production is comparatively higher in the surface region of the materials. The above calculated cross section will be utilized and will be employed in the analysis of medicinal plants at FOTIA (BARC) with the help of NPD, BARC using PIXE technique. Importantly the samples would also be examined by NAA at DHRUVA Research Reactor at BARC for the purpose of cross validation

[en] In present work, the role of shell corrections, on the fragmentation potential or collective potential energy surface in the decay of medium and heavy mass compound nuclei (CN), respectively, ¹²⁴Ce* and ²⁴⁶Bk*, have been elucidated. It is relevant to mention here that the decay of these CN have been studied earlier, within DCM, with the effects of shell corrections included

[en] This paper proposes a compact model for carbon nanotube field effect transistor (CNTFET) based on surface potential and conduction band minima. The proposed model relates the I–V characteristics to chirality under quantum capacitance limit. C–V characteristics have been efficiently modelled for different capacitance models which are used to find the relationship between CNT surface potential and gate voltage. The role of different capacitances is discussed and it has been found that the proposed circuit compact model strictly follows quantum capacitance limit. The proposed model is efficiently designed for circuit simulations as it denies self-consistent numerical simulation. Furthermore, this compact model is compared with experimental results. The model has been used to simulate an inverter using HSPICE. (paper)

[en] The demand of light weight materials with better characteristics are growing day by day due to their demand in automobile and aerospace industry. Magnesium matrix composites have been developed as excellent materials in comparison to conventional cast materials. In the current study, magnesium-based composites have been successfully prepared using automatically controlled stir casting setup. Al₂O₃ particles were embedded in pure Mg matrix by varying the weight % from 3–12. Hardness testing was done on as cast samples. Wear tests were conducted on pin-on-disk under different loads conditions (1 kg–5 kg) and fixed sliding velocity (1 m s⁻¹). The hardness and wear resistance of as cast composites significantly improved in comparison to unreinforced magnesium and it further enhanced with the increase of reinforcement content upto 9 wt% but decreased with further addition. The enhancement in hardness and wear performance was attributed to the dispersion hardening owing to the addition of hard reinforced particles. It was observed that wear resistance decreased with the acceleration of applied load. The dominating wear mechanisms such as abrasion and oxidation were seen in as cast composites. (paper)

[en] We use concurrence as an entanglement measure and experimentally demonstrate the entanglement classification of arbitrary three-qubit pure states on a nuclear magnetic resonance quantum information processor. Computing the concurrence experimentally under three different bipartitions, for an arbitrary three-qubit pure state, reveals the entanglement class of the state. The experiment involves measuring the expectation values of Pauli operators. This was achieved by mapping the desired expectation values onto the local z magnetization of a single qubit. We tested the entanglement classification protocol on twenty-seven different generic states and successfully detected their entanglement class. Full quantum state tomography was performed to construct experimental tomographs of each state and negativity was calculated from them, to validate the experimental results.

[en] The carbon nanotube field effect transistor (CNTFET) is modelled for circuit application. The model is based on the transport mechanism and it directly relates the transport mechanism with the chirality. Also, it does not consider self consistent equations and thus is used to develop the HSPICE compatible circuit model. For validation of the model, it is applied to the top gate CNTFET structure and the MATLAB simulation results are compared with the simulations of a similar structure created in NanoTCAD ViDES. For demonstrating the circuit compatibility of the model, two circuits viz. inverter and SRAM are designed and simulated in HSPICE. Finally, SRAM performance metrics are compared with those of device simulations from Nano TCAD ViDES. (paper)

[en] An attempt has been made to under-stand the stability of the proton shell closure using the dynamical cluster decay (DCM). The decay of CN ²⁰³Bi* has been compared with decay of other compound nuclei having Z near and around proton shell closure Z=82

[en] The non-local nature of the correlations possessed by quantum systems may be revealed by experimental demonstrations of the violation of Bell-type inequalities. Recent work has placed bounds on the correlations that quantum systems can possess in an actual experiment. These bounds were limited to a composite quantum system comprising of a few lower-dimensional subsystems. In a more general approach, it has been shown that fewer body correlations can reveal the non-local nature of the correlations arising from a quantum mechanical description of nature. Such tests on the correlations can be transformed to a semi-definite program (SDP). This study reports the experimental implementation of a local measurement-based hierarchy on the nuclear magnetic resonance (NMR) hardware utilizing three nuclear spins as qubits. The protocol has been experimentally tested on tripartite pseudo-entangled states such as W state, GHZ state and a few graph states. In all the cases, the experimentally measured correlations were used to formulate the SDP, using linear constraints on the entries of the moment matrix. We observed that for each entangled state, the SDP failed to find a semi-definite positive moment matrix consistent with the experimental data. This implies that the observed correlations can not arise from local measurements on a separable state and are hence non-local in nature, and also confirms that the states being tested are indeed entangled.