[en] The use of 8 π and EUROGAM phase I multi-detectors for the study of high spin states of ¹⁴⁹ Gd nucleus has revealed unexpected new phenomenons about the superdeformation in this nucleus. The new excited bands confirm the omnipresence of twin bands phenomenon. A new multi-particle excitation (two protons and one neutron) has been discovered. Thanks to the second generation EUROGAM detector, unexpected discoveries such as C₄ symmetry, level interactions, complete backbending were obtained for the second potential well. The knowledge of interacting levels gives informations about the nucleon-nucleon residual interaction and could allow the determination of SD bands excitation energy. The complex processing and analysis of high multiplicity events has led to the development of new computing tools. An automatic band research program has been written for the discovery of new excited bands, and an exact method for the elimination of uncorrected events has been developed. The improvements of multi-detector performances should allow the discovery of more exceptional phenomenons and new anomalies in the SD bands. (J.S.). 222 refs., 86 figs., 38 tabs

[en] The lattice dynamics of fcc Yb at room temperature and atmospheric pressure has been studied by coherent inelastic scattering of neutrons. The phonon dispersion curves were determined along the [xi00], [xixi0], [xixixi], and [0xi1] symmetry directions. The dispersion curves of this divalent element bear a striking resemblance to those of ν-Ce. In particular, the shear moduli c⁴⁴ and (1/2)(c¹¹-c¹²) differ by approximately a factor of 4, which implies that fcc Yb (like ν-Ce) is very anisotropic regarding the propagation of elastic waves. The frequencies of the T¹[xixi0] branch for xi between approximately 0.5 and 0.7 are slightly above the velocity-of-sound line determined from the low-frequency measurements, an anomaly which may be related to the electronic structure of this divalent element. The data were used to evaluate the elastic constants, the phonon density of states, and the lattice specific heat

[en] Two partial snakes overcome the vertical depolarizing resonances in the AGS. But a new type of depolarizing intrinsic resonance from horizontal motion appeared. We reduce these using horizontal tune jumps timed to these resonances. We gain a factor of six in crossing rate with a tune jump of 0.05 in 100 (micro)s. Two quadrapoles, we described in 2009, pulse 42 times, the current matching beam energy. The power supplies for these quads are described in detail elsewhere in this conference. The controls for the Jump Quad system is based on a BNL designed Quad Function Generator. Two modules are used; one for timing, and one to supply reference voltages. Synchronization is provided by a proprietary serial bus, the Event Link. The AgsTuneJump application predicts the times of the resonances during the AGS cycle and calculates the power supply trigger times from externally collected tune and energy versus time data and the Low and High PS voltage functions from a voltage to current model of the power supply. The system was commissioned during runs 09 and 10 and is operational. Many beam effects are described elsewhere. The TuneJump system has worked well and has caused little trouble save for the perturbations in the lattice having such a large effect due to our need to run with the vertical tune within a few thousandths of the integer tune. As these problems were mostly sorted out by correcting the 6th harmonic orbit distortions which caused a large 18 theta beta wave. Also running with minimal chromaticity reduces emittance growth. There are still small beta waves which are being addressed. The timing of the pulses is still being investigated, but as each crossing causes minimal polarization loss, this is a lengthy process.

[en] Decay spectroscopy of the odd-proton nuclei ${}^{249}$Md and ${}^{251}$Md has been performed. High-K isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of 2.8(5) ms and an excitation energy $\ge <!--\; ???\; -->$ 910 keV was found in ${}^{249}$Md. In ${}^{251}$Md, an isomeric state with a half-life of 1.4(3) s and an excitation energy $\ge <!--\; ???\; -->$ 844 keV was found. Similarly to the neighbouring ${}^{255}$Lr, these two isomeric states are interpreted as 3 quasi-particle high-K states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen-Cooper-Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods-Saxon potential. The most probable candidates for the configurations of K-isomeric states in Md nuclei are proposed.

[en] The 3.8 km circumference Relativistic Heavy Ion Collider (RHIC) at BNL has been in operation since 2000. An electron-ion collider (eRHIC), which is in the design phase, plans to use one of the existing ion rings and new electron rings constructed in the existing tunnel to provide collisions of up to 21.2 GeV electrons with up to 100 GeV gold ions, 250 GeV polarized protons, as well as other species. Many new real-time systems will be required to satisfy the needs of eRHIC, including over 2000 beam position monitors, 1000 beam loss monitors, 18 current monitors, feedback systems, controls for about 10,000 power supplies, machine protection system, new beam timing systems, and more. The selected architecture must be flexible, expandable, cost-effective, reliable, and easy to maintain. Interface with existing and new accelerator timing systems is required, and compatibility with existing infrastructure and equipment must be maintained. Embedded modules based on the Xilinx Zynq gate array, with direct Ethernet connection and on-board Linux, housed in multi-slot chassis (VME, VXS, VPX, TCA, etc.) is under consideration. Preliminary design concepts for the architecture will be presented. (author)

[en] Biosynthetic human growth hormone (hGH) specifically ¹⁵N labelled in the leucine residues has been obtained by recombinant DNA technology, using ¹⁵N-labelled leucine and an E. coli strain that requires leucine. It is shown that, despite the possibility of minor transaminase activity, the labelling on the whole is specific, and that the two-dimensional ¹H-¹⁵N correlation NMR spectra of hGH can be greatly simplified by this methodology. (au)

[en] Algorithms are developed to analyze high-fold γ-ray coincidences. Performances of the programs have been tested in 3, 4 and 5 dimensions using events generated with a Monte Carlo simulation. (orig.)

No abstract available

[en] In order to cool the superconducting magnets in RHIC, its helium refrigerator distributes 4.5 K helium throughout the tunnel along with helium distribution for the magnet line recoolers, the heat shield, and the associated return lines. The worse case for failure would be a release from the magnet distribution line which operates at 3.5 to 4.5 atmospheres and contains the energized magnet but with a potential energy of 70 MJoules should the insulation system fail or an electrical connection opens. Studies were done to determine release rate of the helium and the resultant reduction in O₂ concentration in the RHIC tunnel and service buildings. Equipment and components were also reviewed for design and reliability and modifications were made to reduce the likelihood of failure and to reduce the volume of helium that could be released.

No abstract available