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Clustering aspects of nuclear structure and reactions

Description: Some aspects of clustering phenomena in nuclear structure and reactions are reviewed. Particular emphasis is placed on the relationship between cluster-like states and shape-isomeric states which arise as a result of shell effects in deformed potentials. Some recent evidence in favor of this connection is presented and discussed. 50 refs., 17 figs.
Date: January 1, 1986
Creator: Betts, R. R. & Rae, W. D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent developments in understanding the physics of laser produced plasmas

Description: The absorption of intense laser light by a plasma is known to produce a high energy component of electrons. Even though the hot electron pressure may be larger than the cold background pressure, the background temperature can control the self-consistent profile modification. Since temperatures in high intensity experiments seem to be similar for CO/sub 2/ and Nd glass lasers, the profile modification may be so severe for CO/sub 2/ and Nd glass lasers, the profile modification may be so severe f… more
Date: January 1, 1976
Creator: Bezzerides, B.; DuBois, D. F.; Forslund, D. W.; Kindel, J. M.; Lee, K. & Lindman, E. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Non-reactor neutron irradiation facility: the Argonne Intense Pulsed Neutron Source

Description: A new generation of neutron sources is just coming into existence with great promise for the future. These sources are based on neutron production by spallation from the interaction of high energy protons with a heavy metal target. Currently the highest flux facility of this type is the Intense Pulsed Neutron Source at Argonne National Laboratory. This machine is also unique in its dedication to both slow-neutron scattering and fast-neutron damage studies.
Date: October 1, 1983
Creator: Birtcher, R. C. & Scott, T. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Photoisomerization and photodissociation dynamics of reactive free radicals

Description: The photofragmentation pathways of chemically reactive free radicals have been examined using the technique of fast beam photofragment translational spectroscopy. Measurements of the photodissociation cross-sections, product branching ratios, product state energy distributions, and angular distributions provide insight into the excited state potential energy surfaces and nonadiabatic processes involved in the dissociation mechanisms. Photodissociation spectroscopy and dynamics of the predissoci… more
Date: August 24, 2000
Creator: Bise, Ryan T.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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New Benchmarks from Tokamak Experiments for Theoretical Calculations of the Dielectronic Satellite Spectra of Helium-like Ions

Description: Dielectronic satellite spectra of helium-like argon, recorded with a high-resolution X-ray crystal spectrometer at the National Spherical Torus Experiment, were found to be inconsistent with existing predictions resulting in unacceptable values for the power balance and suggesting the unlikely existence of non-Maxwellian electron energy distributions. These problems were resolved with calculations from a new atomic code. It is now possible to perform reliable electron temperature measurements a… more
Date: August 29, 2003
Creator: Bitter, M.; Gu, M.F.; Vainshtein, L.A.; Beiersdorfer, P.; Bertschinger, G.; Marchuk, O. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of LLNL-ALICE code contribution

Description: We summarize some of the areas of comparison with experimental data for which the ALICE code did poorly. We suggest some aspects which might be improved in the future. A crude accuracy factor is estimated as a predictive reliability based on the intercomparison exercise.
Date: March 24, 1994
Creator: Blann, M.
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Partner: UNT Libraries Government Documents Department
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Single particle effects in precompound decay reactions

Description: Precompound decay models generally rely on use of a partial state density (PSD) formula which is generated using an assumed equidistantly spaced set of single particle levels. This is a reasonable assumption for mid-shell nuclei; however it has been demonstrated that quite large errors may be introduced by making the equidistant spacing assumption for nuclei which have neutron or proton numbers near or at major shell closures. This work reviews the simple qualitative considerations of those dev… more
Date: September 1, 1986
Creator: Blann, M.; Komoto, T.; Reffo, G.; Fabbri, F. & Grimes, S.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reference documents for the proposal for a national synchrotron light source

Description: The spectra, angular distribution and polarization functions of synchrotron radiation are tabulated in parametric form. Numerous graphs of the functions are included which can be used for rapid estimation of photon flux as a function of the various parameters. The extended synchrotron radiation source is described and the exact, but unintegrable, equations are derived. Properties of this source depend upon at least nine parameters. An approximation of the source accurate enough for estimating f… more
Date: February 1, 1977
Creator: Blewett, J. P. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synchrotron radiation: its characteristics and applications

Description: It has been known for a century that charged particles radiate when accelerated and that relativistic electrons in the energy range between 100 MeV and several GeV and constrained to travel in circular orbits emit concentrated, intense beams with broad continuous spectra that can cover the electromagnetic spectrum from infrared through hard X-rays. Recently the possible applications of this radiation have been appreciated and electron synchrotrons and electron storage rings are now being used i… more
Date: January 1, 1977
Creator: Blewett, J. P.; Chasman, R. & Green, G. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent results from DORIS II

Description: This report contains a brief review of recent results from the ARGUS and Crystal Ball experiments at DORIS II, concentrating on UPSILON(1S) and UPSILON(2S) spectroscopy with a short foray into ..gamma gamma.. physics. 18 refs., 10 figs.
Date: January 1, 1985
Creator: Bloom, E.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Monte Carlo calculations of channeling radiation

Description: Results of classical Monte Carlo calculations are presented for the radiation produced by ultra-relativistic positrons incident in a direction parallel to the (110) plane of Si in the energy range 30 to 100 MeV. The results all show the characteristic CR(channeling radiation) peak in the energy range 20 keV to 100 keV. Plots of the centroid energies, widths, and total yields of the CR peaks as a function of energy show the power law dependences of ..gamma../sup 1/ /sup 5/, ..gamma../sup 1/ /sup… more
Date: January 1, 1981
Creator: Bloom, S. D.; Berman, B. L.; Hamilton, D. C.; Alguard, M. J.; Barrett, J. H.; Datz, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of simulation with experiment in an RFQ

Description: The accelerator test stand (ATS) RFQ has provided an opportunity to compare the predictions of the RFQ beam-dynamics code PARMTEQ with actual operation of an RFQ. For this comparison, the code was adapted to simulate the measured operation parameters, which are somewhat different from those of the ideal design. A Monte Carlo code was written to provide input to PARMTEQ, based on measured input beam distributions. With these refinements, the code has given results that are in good agreement with… more
Date: January 1, 1985
Creator: Boicourt, G. P.; Sander, O. R. & Wangler, T. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SNM Movement Detection/Radiation Sensors and Advanced Materials Portfolio Review, CdMnTe (CMT) Gamma Ray Detectors

Description: The project goals are: (1) Develop CMT radiation detectors - Demonstrate feasibility (Phase 1 is complete) and Improve material properties and device performance; (2) This project will lead to novel radiation detectors - high detection efficiency, high energy-resolution, ambient-temperature operation, and low production cost; and (3) Such detectors are needed in areas of nonproliferation and national security for detection of SNM. Research highlights are: (1) We achieved our Phase-I goal - Demo… more
Date: June 2, 2009
Creator: Bolotnikov, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impact of $\tau$ polarization on the study of the MSSM charged Higgs bosons in top quark decays at the ILC

Description: The process of top quark pair production at the ILC with subsequent decays of one of the top quarks to a charged Higgs boson and b-quark is considered. The charged Higgs decays to tau leptons whose polarization is the opposite to those coming from W bosons. This difference is reflected in the energy distributions of the tau decay products in the top quark rest frame, which can be reconstructed at the ILC using the recoil mass technique. We present an analysis including spin correlations, backgr… more
Date: July 1, 2005
Creator: Boos, E.; Bunichev, V.; Carena, Marcela S. & Wagner, C. E. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Use of /sup 12/C(d,p)/sup 13/C and /sup 16/O(d,p)/sup 17/O reactions

Description: The use of nuclear reactions for depth profiling carbon and oxygen in solids is discussed. A general expression for the yield from a nuclear reaction is derived and used to extract depth profiles from the energy spectra by two methods. The first method compares data from a target of unknown composition with a target containing a known concentration of either carbon or oxygen. By dividing the yields from the samples for equal collision energies, a concentration profile within the analyzed sample… more
Date: January 1, 1977
Creator: Borders, J. A. & Harris, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The status of the solar neutrino problem

Description: Perhaps the most outstanding discrepancy between prediction and measurements in current particle physics comes from the solar neutrino problem, in which a large deficit of high-energy solar neutrinos is observed. Many Nonstandard Solar Models have been invoked to try to reduce the predicted flux, but all have run into problems in trying to reproduce other measured parameters (e.g., the luminosity) of the Sun. Other explanations involving new physics such as neutrino decay and neutrino oscillati… more
Date: December 1, 1993
Creator: Bowles, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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On inertial range scaling laws

Description: Inertial-range scaling laws for two- and three-dimensional turbulence are re-examined within a unified framework. A new correction to Kolmogorov`s k{sup {minus}5/3} scaling is derived for the energy inertial range. A related modification is found to Kraichnan`s logarithmically corrected two-dimensional enstrophy cascade law that removes its unexpected divergence at the injection wavenumber. The significance of these corrections is illustrated with steady-state energy spectra from recent high-re… more
Date: December 1, 1994
Creator: Bowman, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A wavenumber-partitioning scheme for two-dimensional statistical closures

Description: One of the principal advantages of statistical closure approximations for fluid turbulence is that they involve smoothly varying functions of wavenumber. This suggests the possibility of modeling a flow by following the evolution of only a few representative wavenumbers. This work presents two new techniques for the implementation of two-dimensional isotropic statistical closures that for the first time allows the inertial-range scalings of these approximation to be numerically demonstrated. A … more
Date: November 1, 1994
Creator: Bowman, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Isovector resonances in pion charge exchange

Description: The (..pi../sup + -/, ..pi../sup 0/) reactions as probes of isovector resonances are discussed. Experimental observation of the isovector monopole resonance is reported. Experimental results are presented for L = 0, 1, and 2 isovector resonances and are compared to random-phase approximation calculations.
Date: January 1, 1985
Creator: Bowman, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Matter in Extreme Conditions Instrument - Conceptual Design Report

Description: The SLAC National Accelerator Laboratory (SLAC), in collaboration with Argonne National Laboratory (ANL), Lawrence Livermore National Laboratory (LLNL), and the University of California at Los Angeles (UCLA), is constructing a Free-Electron Laser (FEL) research facility. The FEL has already met its performance goals in the wavelength range 1.5 nm - 0.15 nm. This facility, the Linac Coherent Light Source (LCLS), utilizes the SLAC 2-Mile Linear Accelerator (linac) and will produce sub-picosecond … more
Date: December 9, 2009
Creator: Boyce, R. F.; Boyce, R. M.; Haller, G.; Hastings, J. B.; Hays, G.; Lee, H. J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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