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in subjects: "Nuclear Reaction Kinetics"  
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Statistical fluctuations in heavy-ion collisions

Description: The relevance of the statistical equilibrium limit to the description of substantially relaxed degrees of freedom is discussed. Fluctuations are considered specifically in the following processes: the correlation between entrance-channel angular momentum and exit-channel kinetic energy; the sharing of the dissipated kinetic energy between the two fragments; the magnitude and the alignment of the fragment angular momentum including the effect of shell structure. It is found that statistical fluc… more
Date: February 1, 1982
Creator: Moretto, Luciano G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved resonance reaction rate calculation for lattice physics subsystem

Description: The resonance capture calculations of the HAMMER System and HAMBUR System are derived from a consistent statement of the integral slowing down equation and definitions of the resonance integral. The assumptions made in these treatments are explicitly stated, and and an attempt is made to estimate the possible error in the resonance integral arising from these assumptions. This analysis is made to pin-point those parts of the calculation that can be improved and updated. Based on the analysis of… more
Date: February 8, 1974
Creator: Finch, D.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tilting mode in nuclear reactions

Description: The relation between tilting relaxation and the reaction plane dynamics is discussed, providing an intuitive understanding of the expression for the cross section close to the beam direction, which has recently been derived. Second, the tilting relaxation time and the related wriggling relaxation time are discussed, based upon nucleon exchange transport (window friction). Finally, recent experimental information on the tilting mode relaxation is discussed, and the dynamics of the tilting mode i… more
Date: February 1, 1986
Creator: Dossing, T. & Randrup, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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[Reaction mechanism studies of heavy ion induced nuclear reactions]. [Dept. of Chemistry and Biochemistry, Univ. of Maryland, College Park, Maryland]

Description: Completed work is summarized on the topics of excitation energy division in deep-inelastic reactions and the onset of multifragmentation in La-induced reactions at E/A = 45 MeV. Magnetic fields are being calculated for the PHOBOS detector system, a two-arm multiparticle spectrometer for studying low-transverse-momentum particles produced at the Relativistic Heavy Ion Collider. The Maryland Forward Array is being developed for detection of the reaction products from very peripheral collisions; i… more
Date: February 1, 1993
Creator: Mignerey, A.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical benchmarking of SPEEDUP{trademark} against point kinetics solutions

Description: SPEEDUP{trademark} is a state-of-the-art, dynamic, chemical process modeling package offered by Aspen Technology. In anticipation of new customers` needs for new analytical tools to support the site`s waste management activities, SRTC has secured a multiple-user license to SPEEDUP{trademark}. In order to verify both the installation and mathematical correctness of the algorithms in SPEEDUP{trademark}, we have performed several numerical benchmarking calculations. These calculations are the firs… more
Date: February 1, 1993
Creator: Gregory, M. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[Reaction mechanism studies of heavy ion induced nuclear reactions]. Annual progress report, [January 1992--February 1993]

Description: Completed work is summarized on the topics of excitation energy division in deep-inelastic reactions and the onset of multifragmentation in La-induced reactions at E/A = 45 MeV. Magnetic fields are being calculated for the PHOBOS detector system, a two-arm multiparticle spectrometer for studying low-transverse-momentum particles produced at the Relativistic Heavy Ion Collider. The Maryland Forward Array is being developed for detection of the reaction products from very peripheral collisions; i… more
Date: February 1, 1993
Creator: Mignerey, A. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reaction rate sensitivity of 44Ti production in massive stars and implications of a thick target yield measurement of 40Ca(alpha,gamma)44Ti

Description: We evaluate two dominant nuclear reaction rates and their uncertainties that affect {sup 44}Ti production in explosive nucleosynthesis. Experimentally we develop thick-target yields for the {sup 40}Ca({alpha},{gamma}){sup 44}Ti reaction at E{sub {alpha}} = 4.13, 4.54, and 5.36 MeV using {gamma}-ray spectroscopy. At the highest beam energy, we also performed an activation measurement which agrees with the thick target result. From the measured yields a stellar reaction rate was developed that is… more
Date: February 16, 2010
Creator: Hoffman, R D; Sheets, S A; Burke, J T; Scielzo, N D; Rauscher, T; Norman, E B et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Numerical benchmarking of SPEEDUP[trademark] against point kinetics solutions

Description: SPEEDUP[trademark] is a state-of-the-art, dynamic, chemical process modeling package offered by Aspen Technology. In anticipation of new customers' needs for new analytical tools to support the site's waste management activities, SRTC has secured a multiple-user license to SPEEDUP[trademark]. In order to verify both the installation and mathematical correctness of the algorithms in SPEEDUP[trademark], we have performed several numerical benchmarking calculations. These calculations are the firs… more
Date: February 1, 1993
Creator: Gregory, M. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The equivalent fundamental-mode source

Description: In 1960, Hansen analyzed the problem of assembling fissionable material in the presence of a weak neutron source. Using point kinetics, he defined the weak source condition and analyzed the consequences of delayed initiation during ramp reactivity additions. Although not clearly stated in Hansen`s work, the neutron source strength that appears in the weak source condition corresponds to the equivalent fundamental-mode source. In this work, we describe the concept of an equivalent fundamental-mo… more
Date: February 1, 1997
Creator: Spriggs, G. D.; Busch, R. D.; Sakurai, Takeshi & Okajima, Shigeaki
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neutral pion production in nucleus-nucleus collisions at 158 and 200 GeV/nucleon

Description: Two years ago, at the 12th Winter Workshop on Nuclear Dynamics held here in Snowbird, the authors presented WA80 limits on direct photon production in 200-GeV {sup 32}S + Au collisions. It was found that the results were consistent (within 1{sigma}) with the absence of an excess of photons over those that can be accounted for by the two-photon decay branches of {pi}{sup 0} and {eta} mesons and by the small photon contributions from other radiative decays. They are in the process of finalizing t… more
Date: February 1, 1998
Creator: Plasil, F.; Collaboration, WA80 & Collaboration, WA98
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies of fluctuation processes in nuclear collisions. [Dept. of Physics, Tennessee Technological Univ. , Cookeville, Tennessee]

Description: Investigations of various aspects of heavy-ion collisions were carried out in the framework of the Boltzmann-Langevin Model (BLM). In a previous work, by projection the BLM onto a collective space, a memory-dependent collective transport model was reduced. This model was applied to thermal fission to investigate the influence of the memory effects on the fission dynamics. Some results of the calculations are presented. In addition a reduction of the relativistic BLM to a two-fluid model was car… more
Date: February 1, 1993
Creator: Ayik, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies of fluctuation processes in nuclear collisions. Progress report, March 1, 1992--February 28, 1993

Description: Investigations of various aspects of heavy-ion collisions were carried out in the framework of the Boltzmann-Langevin Model (BLM). In a previous work, by projection the BLM onto a collective space, a memory-dependent collective transport model was reduced. This model was applied to thermal fission to investigate the influence of the memory effects on the fission dynamics. Some results of the calculations are presented. In addition a reduction of the relativistic BLM to a two-fluid model was car… more
Date: February 1, 1993
Creator: Ayik, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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