High-angular-momentum structures in 64Zn

High-angular-momentum states in 64Zn were populated in the 40Ca( 28Si,4p) reaction at a beam energy of 122 MeV. Evaporated, light, charged particles were identified by the Microball, while γ rays were detected using the Gammasphere array. The main focus of this paper is on two strongly coupled, collective bands. The yrast band, which was previously known, has been linked to lower-lying states establishing the excitation energies and angular momenta of in-band states for the first time. The newly identified excited band decays to the yrast band but firm angular-momentum assignments could not be made. In order to interpret these structures cranked-Nilsson-Strutinsky calculations have been performed. The calculations have been extended to account for the distribution of nucleons within a configuration. The yrast collective band is interpreted as based on the π(f 7/2) -1(p 3/2f 5/2) 2(g 9/2) 1 ν(p 3/2f 5/2) 4(g 9/2) 2 configuration. There are several possible interpretations of the second band but it is difficult to distinguish between the different possibilities

Improving Internal Peptide Dynamics in the Coarse-Grained MARTINI Model: Toward Large-Scale Simulations of Amyloid- and Elastin-like Peptides

We present an extension of the coarse-grained MARTINI model for proteins and apply this extension to amyloid- and elastin-like peptides. Atomistic simulations of tetrapeptides, octapeptides, and longer peptides in solution are used as a reference to parametrize a set of pseudodihedral potentials that describe the internal flexibility of MARTINI peptides. We assess the performance of the resulting model in reproducing various structural properties computed from atomistic trajectories of peptides in water. The addition of new dihedral angle potentials improves agreement with the contact maps computed from atomistic simulations significantly. We also address the question of which parameters derived from atomistic trajectories are transferable between different lengths of peptides. The modified coarse-grained model shows reasonable transferability of parameters for the amyloid- and elastin-like peptides. In addition, the improved coarse-grained model is also applied to investigate the self-assembly of β-sheet forming peptides on the microsecond time scale. The octapeptides SNNFGAIL and (GV)4 are used to examine peptide aggregation in different environments, in water, and at the water–octane interface. At the interface, peptide adsorption occurs rapidly, and peptides spontaneously aggregate in favor of stretched conformers resembling β-strands

Doorway States in the Gamma Decay-out of the Yrast Superdeformed Band in 59Cu

The decay-out process of the yrast superdeformed band in Cu-59 has been investigated. The firm determination of spin, parity, excitation energy, and configuration of the states involved in this process constitutes a unique situation for a detailed understanding of the decay-out mechanism. A theoretical model is introduced that includes a residual interaction and tunneling matrix element between bands, calculated in the configuration-dependent cranked Nilsson-Strutinsky model. This interaction causes the decay to occur via a small number of observed doorway states

Evolution of Shapes in 59Cu

High-spin states in Cu-59 were populated using the fusion-evaporation reaction Si-28 + Ca-40 at a beam energy of 122 MeV. The Gammasphere Ge-detector array in conjunction with the 4pi charged-particle detector array Microball allowed for the detection of gamma-rays in coincidence with evaporated light particles. The resulting extensive high-spin decay scheme of Cu-59 is presented, which comprises more than 320 gamma-ray transitions connecting about 150 excited states. Their spins and parities have been assigned via directional correlations of gamma-rays emitted from oriented states. Average quadrupole moments of rotational bands have been determined from the analysis of residual Doppler shifts. Shell model calculations in the fp shell are invoked to study some of the low-spin states, while the experimental characteristics of the rotational bands are analyzed in the configuration-dependent cranked Nilsson-Strutinsky (CNS) approach

Evolution of shapes in \chem{^{59}Cu}

High-spin states in \chem{^{59}Cu} were populated using the fusion-evaporation reaction \chem{^{28}Si +{} ^{40}Ca} at a beam energy of 122 MeV. The Gammasphere Ge-detector array in conjunction with the 4$\pi$ charged-particle detector array Microball allowed for the detection of $\gamma$-rays in coincidence with evaporated light particles. The resulting extensive high-spin decay scheme of \chem{^{59}Cu} is presented, which comprises more than 320 $\gamma$-ray transitions connecting about 150 excited states. Their spins and parities have been assigned via directional correlations of $\gamma$-rays emitted from oriented states. Average quadrupole moments of rotational bands have been determined from the analysis of residual Doppler shifts. Shell model calculations in the $fp$ shell are invoked to study some of the low-spin states, while the experimental characteristics of the rotational bands are analyzed in the configuration-dependent cranked Nilsson-Strutinsky (CNS) approach

Systematic survey of Δ\DeltaI=4 bifurcation in A≈\approx150 superdeformed nuclei

Hydro-Québec has used a new approach for Reliability Assessment with a prototype called FIORD, a French acronym for a global reliability assessment system. What were the context and the reasons for these new developments? What's new in this approach? How does it work? What did it bring? In the context of recommending a distribution MV grid automation program, Hydro-Québec had to evaluate the benefits of various automation scenarios in order to compare the expected improvements with the present situation. The study had to cover the entire distribution MV grid, using input data representing correctly the present situation and simulation techniques which are sensitive to various scenarios according to the improvements brought by new technologies. In order to fulfill these requirements, a new global approach had to be introduced. The FIORD prototype is based on a new method for the calculation of outage duration for each delivery point: • Detailed simulation of the Outage / Restoration process • System modelling representing: protection, switching, monitoring, communication, remote control, etc. • Analysis and reasoning • Decision making and action In addition, each study covers a set of feeders – possibly a region or the whole distribution MV grid – where various scenarios are compared. In each scenario, automatic modifications of feeders' topology and equipment are brought according to designer's rules. This global approach allowed Hydro-Quebec to quantify the improvement of the reliability of its distribution MV grid due to 9 major scenarios. Such a study would have been impossible with the available reliability assessment tools: • 24300 studies would have been necessary with present software. • Restoration time for a delivery point would not have taken into account the particularities of each scenario. Therefore, the new global approach developed for FIORD is a technical Breakthrough. Upgrading existing tools in order to include FIORD's new approach becomes a necessity. Now, the new methodology developed for this prototype has to be incorporated into a commercial high quality software and benefit of all its valuable features

High-angular-momentum structures in 64 Zn

High-angular-momentum states in 64Zn were populated in the 40Ca( 28Si,4p) reaction at a beam energy of 122 MeV. Evaporated, light, charged particles were identified by the Microball, while γ rays were detected using the Gammasphere array. The main focu