Statistical properties of antisymmetrized molecular dynamics for non-nucleon-emission and nucleon-emission processes

Statistical properties of the antisymmetrized molecular dynamics (AMD) are classical in the case of nucleon emission processes, while they are quantum mechanical for the processes without nucleon emission. We first clarify that there coexist mutually opposite two statistics in the AMD framework: One is the classical statistics of the motion of wave packet centroids and the other is the quantum statistics of the motion of wave packets which is described by the AMD wave function. We prove the classical statistics of wave packet centroids by using the framework of the microcanonical ensemble of the nuclear system. We show that the quantum statistics of wave packets emerges from the classical statistics of wave packet centroids. It is emphasized that the temperature of the classical statistics of wave packet centroids is different from the temperature of the quantum statistics of wave packets. We then explain that the statistical properties of AMD for nucleon emission processes are classical because nucleon emission processes in AMD are described by the motion of wave packet centroids. When we improve the description of the nucleon emission process so as to take into account the momentum fluctuation due to the wave packet spread, the AMD statistical properties for nucleon emission processes change drastically into quantum statistics. Our study of nucleon emission processes can be conversely regarded as giving another kind of proof of the fact that the statistics of wave packets is quantum mechanical while that of wave packet centroids is classical.Comment: 20 pages, LaTeX with revtex and epsf, uuenocded postscript figures, postscript version available at http://pearl.scphys.kyoto-u.ac.jp/~ono

Comparison of dynamical multifragmentation models

Multifragmentation scenarios, as predicted by antisymmetrized molecular dynamics (AMD) or momentum-dependent stochastic mean-field (BGBD) calculations are compared. While in the BGBD case fragment emission is clearly linked to the spinodal decomposition mechanism, i.e. to mean-field instabilities, in AMD many-body correlations have a stronger impact on the fragmentation dynamics and clusters start to appear at earlier times. As a consequence, fragments are formed on shorter time scales in AMD, on about equal footing of light particle pre-equilibrium emission. Conversely, in BGBD pre-equilibrium and fragment emissions happen on different time scales and are related to different mechanisms

Spin Polarization and Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Devices

The magneto-Coulomb oscillation, the single electron repopulation induced by external magnetic field, observed in a ferromagnetic single electron transistor is further examined in various ferromagnetic single electron devices. In case of double- and triple-junction devices made of Ni and Co electrodes, the single electron repopulation always occurs from Ni to Co electrodes with increasing a magnetic field, irrespective of the configurations of the electrodes. The period of the magneto-Coulomb oscillation is proportional to the single electron charging energy. All these features are consistently explained by the mechanism that the Zeeman effect induces changes of the Fermi energy of the ferromagnetic metal having a non-zero spin polarizations. Experimentally determined spin polarizations are negative for both Ni and Co and the magnitude is larger for Ni than Co as expected from band calculations.Comment: 4 pages, 3 figures, uses jpsj.sty, submitted to J. Phys. Soc. Jp

PECALONARANGAN DALAM PERTUNJUKAN WAYANG KULIT RAMAYANA LAKON LAKSMANA HILANG OLEH DALANG DEWA RAI DI DESA PENINJOAN KANGIN, DENPASAR, KAJIAN BENTUK DAN FUNGSI

ABSTRAK Kesenian wayang kulit sebagai salah satu seni pertunjukan wayang kulit tradisi, mendapat tempat yang sangat istimewa di hati masyarakat Bali. Pertunjukan wayang kulit Bali dijiwai oleh unsur-unsur kebudayaan masyarakat Hindu, maka pertunjukan wayang kulit Bali merupakan kesenian yang utameng lungguh yang sangat disakralkan oleh umat Hindu. Terdapat berbagai jenis bentuk pertunjukan wayang, salah satunya adalah wayang kulit Calonarang. Calonarang menggunakan sumber lakon ceritera Calonarang, sedangkan pecalonarangan menggunakan lakon selain ceritera Calonarang, namun masih bertemakan kekuatan magis (rwa bhineda). Pecalonarangan dalam bentuk pertunjukan wayang kulit, menggunakan berbagai macam sumber lakon. Pertunjukan wayang kulit tradisi konvensional menggunakan lakon dari epos Mahabharata dan epos Ramayana. Kedua sumber lakon ini, juga dimanfaatkan oleh seorang dalang pecalonarangan. Dewa Rai adalah seorang dalang dari Payangan Gianyar yang merupakan dalang wayang kulit Ramayana yang memasukkan unsur-unsur Calonarang dalam pertunjukannya, seperti dalam adegan pengerehan dan pengundangan. Dalam hal ini, menarik bagi penulis untuk mengkaji tentang Pecalonarangan dalam Pertunjukan Wayang Kulit Ramayana Lakon Laksmana Hilang oleh Dalang Dewa Rai di Desa Peninjoan Kangin, Denpasar. Secara umum penelitian ini bertujuan untuk mengetahui bentuk dan fungsi Pecalonarangan dalam Pertunjukan Wayang Kulit Ramayana Lakon Laksmana Hilang oleh Dalang Dewa Rai di Desa Peninjoan Kangin, Denpasar yang inovatif bernuansa mistik. Ruang lingkup penelitian ini dibatasi pada penyajian Bentuk, Fungsi Pecalonarangan dalam Pertunjukan Wayang Kulit Ramayana Lakon Laksmana Hilang oleh Dalang Dewa Rai di Desa Peninjoan Kangin, Denpasar. Landasan teori yang digunakan adalah teori estetika dan teori fungsi. Penelitian ini di rancang dalam bentuk penelitian kualitatif. Data dibedakan menjadi dua, yakni: data primer dan data sekunder. Sumber data dibedakan menjadi dua, yakni: (1) sumber data primer adalah sumber data yang berupa melihat langsung Pecalonarangan dalam Pertunjukan Wayang Kulit Ramayana Lakon Laksmana Hilang oleh Dalang Dewa Rai di Desa Peninjoan Kangin, Denpasar, yang sekaligus merupakan objek observasi, dan informan yaitu orang yang diwawancarai, dan (2) Sumber data sekunder adalah sumber data yang berupa buku-buku kepustakaan, surat kabar, jurnal, hasil penelitian sebelumnya. Bentuk-bentuk pecalonarangan meliputi; a) antawacana (dialog), b) tetikesan (gerak wayang), c) iringan, d) wayang, e) tata cahaya, d) sesajen. Fungsi yang terdapat pada Pecalonarangan dalam Pertunjukan Wayang Kulit Ramayana Lakon Laksmana Hilang oleh Dalang Dewa Rai di Desa Peninjoan Kangin, Denpasar, yakni: fungsi estetika, fungsi hiburan, fungsi promosi dan fungsi kreativitas. Kata kunci: Pecalonarangan, Wayang Kulit Ramayana, Bentuk dan Fungsi

Doping-driven Mott transition in La_{1-x}Sr_xTiO_3 via simultaneous electron and hole doping of t2g subbands

The insulator to metal transition in LaTiO_3 induced by La substitution via Sr is studied within multi-band exact diagonalization dynamical mean field theory at finite temperatures. It is shown that weak hole doping triggers a large interorbital charge transfer, with simultaneous electron and hole doping of t2g subbands. The transition is first-order and exhibits phase separation between insulator and metal. In the metallic phase, subband compressibilities become very large and have opposite signs. Electron doping gives rise to an interorbital charge flow in the same direction as hole doping. These results can be understood in terms of a strong orbital depolarization.Comment: 4 pages, 5 figure

Critical Level Statistics in Two-dimensional Disordered Electron Systems

The level statistics in the two dimensional disordered electron systems in magnetic fields (unitary ensemble) or in the presence of strong spin-orbit scattering (symplectic ensemble) are investigated at the Anderson transition points. The level spacing distribution functions $P(s)$'s are found to be independent of the system size or of the type of the potential distribution, suggesting the universality. They behave as $s^2$ in the small $s$ region in the former case, while $s^4$ rise is seen in the latter.Comment: LaTeX, to be published in J. Phys. Soc. Jpn. (Letter) Nov., Figures will be sent on reques

Delta degrees of freedom in antisymmetrized molecular dynamics and (p,p') reactions in the delta region

Delta degrees of freedom are introduced into antisymmetrized molecular dynamics (AMD). This is done by increasing the number of basic states in the AMD wave function, introducing a Skyrme-type delta-nucleon potential, and including $NN\leftrightarrow N\Delta$ reactions in the collision description. As a test of the delta dynamics, the extended AMD is applied to (p,p$'$) recations at $E_{\rm lab}=800$ MeV for a $^{12}$C target. It is found that the ratio and the absolute values for delta peak and quasielastic peak (QEP) in the $^{12}$C(p,p$'$) reaction are reproduced for angles \Theta_{\rm lab} \agt 40^\circ, pointing to a correct treatment of the delta dynamics in the extended AMD. For forward angles the QEP is overestimated. The results of the AMD calculations are compared to one-step Monte Carlo (OSMC) calculations and a detailed analysis of multi-step and delta potential effects is given. As important side results we present a way to apply a Gallilei invariant theory for (N,N$'$) reactions up to $E_{\rm lab} \approx 800$ MeV which ensures approximate Lorentz invariance and we discuss how to fix the width parameter $\nu$ of the single particle momentum distribution for outgoing nucleons in the AMD calculation.Comment: 28 pages, revtex, 12 figures included, figures are also available upon request as postscript files from the authors (e-mail: [email protected]), submitted to Phys. Rev.

ON THE LOW-TEMPERATURE ORDERING OF THE 3D ATIFERROMAGNETIC THREE-STATE POTTS MODEL

The antiferromagnetic three-state Potts model on the simple-cubic lattice is studied using Monte Carlo simulations. The ordering in a medium temperature range below the critical point is investigated in detail. Two different regimes have been observed: The so-called broken sublattice-symmetry phase dominates at sufficiently low temperatures, while the phase just below the critical point is characterized by an effectively continuous order parameter and by a fully restored rotational symmetry. However, the later phase is not the permutationally sublattice symmetric phase recently predicted by the cluster variation method.Comment: 20 pages with 9 figures in a single postscript file (compressed and uuencoded by uufiles -gz -9) plus two big figures in postscript file

Negative differential conductance and magnetoresistance oscillations due to spin accumulation in ferromagnetic double-island devices

Spin-dependent electronic transport in magnetic double-island devices is considered theoretically in the sequential tunneling regime. Electric current and tunnel magnetoresistance are analyzed as a function of the bias voltage and spin relaxation time in the islands. It is shown that the interplay of spin accumulation on the islands and charging effects leads to periodic modification of the differential conductance and tunnel magnetoresistance. For a sufficiently long spin relaxation time, the modulations are associated with periodic oscillations of the sign of both the tunnel magnetoresistance and differential conductance

Application of Correct-by-Construction Principles for a Resilient Risk-Aware Architecture

In this paper we discuss the application of correct-by-construction techniques to a resilient, risk-aware software architecture for onboard, real-time autonomous operations. We mean to combat complexity and the accidental introduction of bugs through the use of verifiable auto-coding software and correct-by-construction techniques, and discuss the use of a toolbox for correct-by-construction Temporal Logic Planning (TuLiP) for such a purpose. We describe some of TuLiP’s current functionality, specifically its ability to model symbolic discrete systems and synthesize software controllers and control policies that are correct-by-construction. We then move on to discuss the use of these techniques to define a deliberative goal-directed executive capability that performs risk-informed action-planning – to satisfy the mission goals (specified by mission control) within the specified priorities and constraints. Finally, we discuss an application of the TuLiP process to a simple rover resilience scenario