N. V. Zamfir

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The aim of this paper is to discuss and compare several architectural possibilities for implementing a simulator for (ultra) sound propagation in a controlled environment (e.g. using specified obstacles and signal sources). Although initially such sound propagation simulators were designed to assist the design of robotic "ears" of autonomous agents trying(More)
Quantum phase transitions in mesoscopic systems are studied. It is shown that the main features of phase transitions, defined for infinite number of particles, N--> infinity, persist even for moderate N approximately 10. A Landau analysis of first order transitions is done and a "critical" exponent at the spinodal point is defined. Two order parameters are(More)
Lifetimes of states in 150Nd were measured using the recoil distance method following Coulomb excitation of 150Nd by a 132 MeV 32S beam. The experiment was performed at the Yale Tandem accelerator, employing the SPEEDY gamma-ray detector array and the New Yale Plunger Device. Reduced transition probabilities in 150Nd are compared to the predictions of the(More)
The study of spherical-deformed ground–state phase transitions in finite nuclei as a function of N and Z is hindered by the discrete values of the nucleon number. A resolution of the integer nucleon number problem, and evidence relating to phase transitions in finite nuclei, are discussed from the experimental point of view and interpreted within the(More)
Low-energy excited states of 208 Ra were investigated using the 182 W(30 Si, 4n) reaction at the Wright Nuclear Structure Laboratory of Yale University. Fusion evaporation recoils were selected using the gas-filled spectrometer SASSYER. Delayed γ rays, following isomeric decays, were detected at the focal plane of SASSYER with a small array of three clover(More)
Evidence is presented to show that a group of nuclei, spanning a range of structures, corresponds to a previously proposed isolated region of regular behavior between vibrational and rotational structures that was never before observed empirically. Nuclei predicted to show such regular spectra correspond to Hamiltonian parameters that lie amidst those(More)
Zs. Podolyák, S. Al-Garni, R.F. Casten, J.R Cooper,* D.M. Cullen, A. Dewald, R. Krücken, H. Newman, J.N. Orce, C.J. Pearson, C. Ur, R. Venturelli, S. Vincent, C. Wheldon, P.M. Walker, F.R. Xu, A. Yamamoto, and N.V. Zamfir Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom A.W. Wright Nuclear Structure Laboratory, Department of(More)