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Studies of complex fragment emission in heavy ion reactions

Description: This report discusses the following topics: High energy photon production in a HI collision; the mechanism for the disassembly of excited {sup 16}O projectiles into four alpha particles; the disassembly of excited {sup 28}Si projectiles; large pre-fission multiplicities from temperature; dependent friction and fission barriers; multiplicity correlations; molecular beam induced fusion; dwarf ball and wall; mini wall; and computer and local data acquisition systems.
Date: September 4, 1991
Creator: Charity, R.J. & Sobotka, L.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integrated system for production of neutronics and photonics calculational constants. Volume 10, Revision 1. Neutron-induced interactions: tabulated experimental data

Description: We provide, on microfiche records, tabulated values for data points in the Experimental Cross-Section Information Library (ECSIL). The microfiche records also include corresponding bibliographic information and data indexes. ECSIL now contains 1,600,000 neutron-cross-section data points.
Date: July 4, 1976
Creator: MacGregor, M.H.; Cullen, D.E.; Howerton, R.J. & Perkins, S.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Data testing results for the ENDF/B-V Evaluated Neutron Data File. [20 spheres pulsed with 14-Mev neutrons]

Description: The ENDF/B-V Evaluated Neutron Data File has been tested for validity by comparing calculated and experimental values of k/sub eff/ for 66 critical assemblies and emission neutron spectra for 20 spheres that were pulsed with 14-MeV neutrons. 20 figures, 7 tables.
Date: July 4, 1980
Creator: Howerton, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On a Thermal Analysis of a Second Stripper for Rare Isotope Accelerator.

Description: This memo summarizes simple calculations and results of the thermal analysis on the second stripper to be used in the driver linac of Rare Isotope Accelerator (RIA). Both liquid (Sodium) and solid (Titanium and Vanadium) stripper concepts were considered. These calculations were intended to provide basic information to evaluate the feasibility of liquid (thick film) and solid (rotating wheel) second strippers. Nuclear physics calculations to estimate the volumetric heat generation in the stripp… more
Date: August 4, 2008
Creator: Momozaki, Y. & Nolen, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Further improvement in the precision of 233U measurements by accelerator mass spectrometry at the Lawrence Livermore National Laboratory.

Description: In response to sponsor interest in October 2005 we proposed two methods for enhancing the precision of {sup 233}U accelerator mass spectrometry (AMS) capabilities at the Lawrence Livermore National Laboratory (LLNL). In a previous report we evaluated the first method and demonstrated that by increasing sample loading by a factor of four coupled with performing four replicates of each sample, we could achieve measurement precision of {approx}1%. Recent modifications to our system have enabled us… more
Date: February 4, 2008
Creator: Tumey, S. J.; Brown, T. A.; Hamilton, T. F. & Buchholz, B. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reply to Comment on "Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model"

Description: In their comment on our recent Letter [1] Dean et al. [2] criticize the calculations for the ground-state energy of {sup 40}Ca within the importance truncated no-core shell model (NCSM). In particular they address the role of configurations beyond the 3p3h level, which have not been included in the {sup 40}Ca calculations for large N{sub max} {h_bar}{Omega} model spaces. Before responding to this point, the following general statements are in order. For the atomic nucleus as a self-bound system… more
Date: January 4, 2008
Creator: Roth, R & Navratil, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spontaneous fission of /sup 259/Md

Description: The mass and kinetic energy distributions of fission fragments from the spontaneous fission of th newly discovered nuclide /sup 259/Md were obtained. /sup 259/Md was identified as the E. C. daughter of /sup 259/No, and was found to decay entirely (> 95%) by spontaneous fission with a 95-min half-life. From the kinetic energies measured for 397 pairs of coincident fragments, a mass distribution was derived that is symmetric with sigma = 13 amu. /sup 259/Md, together with /sup 258/Fm and /sup 259… more
Date: May 4, 1979
Creator: Hulet, E. K.; Wild, J. F.; Lougheed, R. W.; Baisden, P. A.; Landrum, J. H.; Dougan, R. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental level-structure determination in odd-odd actinide nuclei

Description: The status of experimental determination of level structure in odd-odd actinide nuclei is reviewed. A technique for modeling quasiparticle excitation energies and rotational parameters in odd-odd deformed nuclei is applied to actinide species where new experimental data have been obtained by use of neutron-capture gamma-ray spectroscopy. The input parameters required for the calculation are derived from empirical data on single-particle excitations in neighboring odd-mass nuclei. Calculated con… more
Date: April 4, 1985
Creator: Hoff, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pion and kaon interferometry of nuclear collisions

Description: In the study complex reactions, the simple space-time interpretation of pion interferometry often breaks down due to strong correlations between spatial and momentum coordinates. In those cases, pion interferometry is still useful as a complementary test of specific dynamic models, but a refined formalism must be used, as discussed in the introduction. With this formalism, we show that recent NA35 data on O + Au {yields} {pi}{sup {minus}}{pi}{sup {minus}} + X at 200 AGeV are consistent with bot… more
Date: August 4, 1989
Creator: Gyulassy, M. & Padula, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental and evaluated nuclear plus interference cross sections for light charged particles

Description: Experimental and evaluated integral parameters derived from nuclear plus interference differential elastic scattering cross sections are presented for all projectile/target combinations of the particles p, d, t, /sup 3/He, and ..cap alpha... The data include reaction rates, average fractional energy losses per collision and per unit path length, and average laboratory scattering cosines. The resulting parameters are of potential use in analysis of charged-particle transport.
Date: July 4, 1980
Creator: Perkins, S.T. & Cullen, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Program GROUPIE (version 79-1): calculation of Bondarenko self-shielded neutron cross sections and multiband parameters from data in the ENDF/B format

Description: Program GROUPIE reads evaluated data in the ENDF/B format and uses these data to calculate Bondarenko self-shielded cross sections and multiband parameters. To give as much generality as possible, the program allows the user to specify arbitrary energy groups and an arbitrary energy groups and an arbitrary energy-dependent neutron spectrum (weighing function). To guarantee the accuracy of the results, all integrals are performed analytically; in no case is iteration or any approximate form of i… more
Date: July 4, 1980
Creator: Cullen, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integrated system for production of neutronics and photonics calculational constants. Volume 17, Part A, Rev. 1. Program linear (Version 78-1): linearize data in the evaluated nuclear data file/Version B (ENDF/B) format. [For CDC-7600]

Description: The computer code LINEAR converts evaluated cross sections in the ENDF/B format into a form that can be defined by applying linear--linear interpolation to energy and cross section parameters. The code also thins those sections already in that form. The main advantage of the code is that it eliminates the need for any subsequent code to consider anything but linear--linear data. 2 figures.
Date: July 4, 1978
Creator: Cullen, D.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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HLNC calibration and application to waste measurement

Description: This paper addresses problems of calibration and estimation of a parameter, p{sub o}, in high level neutron coincidence counting (HLNC) measurement. The presentation begins with a deductive approach, based on the generally accepted physical equations which are satisfied by the total and coincidence count rates. A new approach for the estimation of p{sub o} via measurement and a new calibration procedure consistent with the physical theory of coincidence counting measurement are presented. The a… more
Date: March 4, 1992
Creator: Lu, Ming Shih; Teichmann, T. & De Ridder, P. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The relativistic treatment of symmetric and asymmetric nuclear matter

Description: In the framework of relativistic nuclear field theory the authors discuss and compare the different approaches in the treatment of nuclear-many-problem with inclusion of two-body correlations. The equations are solved self-consistently in the full Dirac space, so avoiding the ambiguities in the choice of the effective scattering amplitude. The results are compared with the standard method, where one only determines the scattering amplitude for positive energy spinors. Furthermore they tested th… more
Date: November 4, 1993
Creator: Huber, H.; Weigel, M. K. & Weber, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ab Initio Nuclear Structure from Helium to Oxygen Final Report: 00-ERD-028

Description: Final report for a research program in theoretical nuclear physics to develop methods and computer programs to perform ab initio calculations for light nuclei ranging from Helium to Oxygen. The method employed is based effective interaction theory within the framework of the shell model. The principal accomplishments were: (1) participation in the validation of ab initio for {sup 4}He; the first study of A = 6 nuclei with the realistic, non-local CD-Bonn potential; (2) a study of ''intruder'' s… more
Date: February 4, 2003
Creator: Ormand, W E & Navratil, P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HLNC calibration and application to waste measurement

Description: This paper addresses problems of calibration and estimation of a parameter, p{sub o}, in high level neutron coincidence counting (HLNC) measurement. The presentation begins with a deductive approach, based on the generally accepted physical equations which are satisfied by the total and coincidence count rates. A new approach for the estimation of p{sub o} via measurement and a new calibration procedure consistent with the physical theory of coincidence counting measurement are presented. The a… more
Date: March 4, 1992
Creator: Lu, Ming Shih; Teichmann, T. (Brookhaven National Lab., Upton, NY (United States)) & De Ridder, P. M. (International Atomic Energy Agency, Vienna (Austria))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated system for production of neutronics and photonics calculational constants. Major neutron-induced interactions (Z less than or equal to 55): graphical, experimental data

Description: This report (vol. 7) presents graphs of major neutron-induced interaction cross sections in the Experimental Cross Section Information Library (ECSIL) as of July 4, 1976. It consists primarily of interactions where a single data set contains enough points to show cross-section behavior. In contrast, vol. 8 of this UCRL-50400 series consists of interactions where more than one data set is needed to show cross section behavior. Thus, you can find the total, elastic, capture, and fission cross sec… more
Date: July 4, 1976
Creator: Cullen, D. E.; Howerton, R. J.; MacGregor, M. H. & Perkins, S. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron Capture Gamma-Ray Libraries for Nuclear Applications

Description: The neutron capture reaction is useful in identifying and analyzing the gamma-ray spectrum from an unknown assembly as it gives unambiguous information on its composition. this can be done passively or actively where an external neutron source is used to probe an unknown assembly. There are known capture gamma-ray data gaps in the ENDF libraries used by transport codes for various nuclear applications. The Evaluated Gamma-ray Activation file (EGAF) is a new thermal neutron capture database of d… more
Date: November 4, 2010
Creator: Sleaford, B. W.; Firestone, R. B.; Summers, N.; Escher, J.; Hurst, A.; Krticka, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Compendium of Material Composition Data for Radiation Transport Modeling

Description: Introduction Meaningful simulations of radiation transport applications require realistic definitions of material composition and densities. When seeking that information for applications in fields such as homeland security, radiation shielding and protection, and criticality safety, researchers usually encounter a variety of materials for which elemental compositions are not readily available or densities are not defined. Publication of the Compendium of Material Composition Data for Radiation… more
Date: March 4, 2011
Creator: McConn, Ronald J.; Gesh, Christopher J.; Pagh, Richard T.; Rucker, Robert A. & Williams III, Robert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integrated system for production of neutronics and photonics calculational constants. Supplemental neutron-induced interactions (Z > 35): graphical, experimental data. [61,671 data points]

Description: This report (vol. 8) presents graphs of supplemental neutron-induced cross sections in the Experimental Cross Section Information Library (ECSIL) as of July 4, 1976. It consists of interactions where more than one data set is needed to show cross-section behavior. In contrast, vol. 7 of this UCRL-50400 series consists primarily of interactions where a single data set contains enough points to show cross-section behavior. Vol. 7 contains total, elastic, capture, and fission cross sections (along… more
Date: July 4, 1976
Creator: Cullen, D. E.; Howerton, R. J.; MacGregor, M. H. & Perkins, S. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Polarized proton beams in RHIC

Description: The polarized beam for RHIC is produced in the optically-pumped polarized H{sup -} ion source and then accelerated in Linac to 200 MeV for strip-injection to Booster and further accelerated 24.3 GeV in AGS for injection in RHIC. In 2009 Run polarized protons was successfully accelerated to 250 GeV beam energy. The beam polarization of about 60% at 100 GeV beam energy and 36-42% at 250 GeV beam energy was measured with the H-jet and p-Carbon CNI polarimeters. The gluon contribution to the proton… more
Date: October 4, 2010
Creator: Zelenski, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TARTNP: a coupled neutron--photon Monte Carlo transport code. [10-/sup 9/ to 20 MeV; in LLL FORTRAN]

Description: A Monte Carlo code was written that calculates the transport of neutrons, photons, and neutron-induced photons. The cross sections of these particles are derived from TARTNP's data base, the Evaluated Nuclear Data Library. The energy range of the neutron data in the Library is 10/sup -9/ MeV to 20 MeV; the photon energy range is 1 keV to 20 MeV. One of the chief advantages of the code is its flexibility: it allows up to 17 different kinds of output to be evaluated in the same problem.
Date: July 4, 1976
Creator: Plechaty, E. F. & Kimlinger, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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