Physical Sciences and Mathematics Commons^™

Two-Fragment Correlation Functions With Directional Cuts For Central 36ar + 197au Collisions At E/A=50 Mev, T. Glasmacher, L. Phair, D. R. Bowman, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, R. T. De Souza, M. B. Tsang, F. Zhu

Faculty Publications

Two-fragment correlation functions observed in central collisions of Ar36+197Au at E/A=50 MeV are compared to many-body trajectory calculations. For the present reaction, ambiguities between source size and lifetime can be reduced by employing directional emission cuts and describing observed differences between longitudinal and transverse correlation functions. For fragments emitted above the Coulomb barrier, E/A≥6 MeV, many-body Coulomb-trajectory calculations with a surface emission model indicate emission from an extended source of short lifetime.

Two-Proton Correlation Functions For 36ar + 45sc At E/A=80 Mev, D. O. Handzy, M. A. Lisa, C. K. Gelbke, W. Bauer, F. C. Decowski, W. G. Gong, E. Gualtieri, S. Hannuschke, R. Lacey, T. Li, W. G. Lynch, C. M. Mader, Graham F. Peaslee, T. Reposeur, S. Pratt, A. M. Vander Molen, G. D. Westfall, J. Yee, S. J. Yennello

Faculty Publications

Impact-parameter filtered longitudinal and transverse two-proton correlation functions measured for 36Ar+ 45Sc collisions at E/A=80 MeV are compared to predictions of the BUU transport model. For a cut on large transverse energies, the overall trends of the measured correlated functions are rather well reproduced by calculations for central collisions. Systematic discrepancies become visible, however, for calculations with larger impact parameters.

Inter-Relations Of Solvable Potentials, Asim Gangopadhyaya, Prasanta K. Panigrahi, Uday P. Sukhatne

Physics: Faculty Publications and Other Works

Solvable Natanzon potentials in nonrelativistic quantum mechanics are known to group into two disjoint classes depending on whether the Schrödinger equation can be reduced to a hypergeometric or a confluent hypergeometric equation. All the potentials within each class are connected via point canonical transformations. We establish a connection between the two classes with appropriate limiting procedures and redefinition of parameters, thereby inter-relating all known solvable potentials.

Energy Dependence Of Multifragmentation In 84kr+197au Reactions, Graham F. Peaslee, M. B. Tsang, C. Schwarz, M. J. Huang, W. S. Huang, W. C. Hsi, C. Williams, W. Bauer, D. R. Bowman, M. Chartier, J. Dinius, C. K. Gelbke, T. Glasmacher, D. O. Handzy, M. A. Lisa, W. G. Lynch, C. M. Mader, L. Phair, M-C. Lemaire, S. R. Souza, G. Van Buren, R. J. Charity, L. G. Sobotka, G. J. Kunde, U. Lynen, J. Pochodzalla, H. Sann, W. Trautmann, D. Fox, R. T. De Souza, G. Peilert, W. A. Friedman, N. Carlin

Faculty Publications

The relationship between observed intermediate mass fragment and total charged particle multiplicities has been measured for Kr84 + Au197 collisions at energies between E/A=35 and 400 MeV. Fragment multiplicities are greatest for central or near-central collisions. For these collisions, fragment production increases up to E/A≊100 MeV, and then decreases at higher energies.

Time Scale For Proton Emission From Highly Excited Projectiles, R. J. Charity, L. G. Sobotka, G. Van Buren, F. A. Tibbals, J. Barreto, D. R. Bowman, M. Chartier, J. Dinius, D. Fox, C. K. Gelbke, D. O. Handzy, W. C. Hsi, P. F. Hua, A. S. Kirov, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, L. Phair, D. G. Sarantites, C. Schwarz, R. T. De Souza, M. B. Tsang, C. Williams

Faculty Publications

Highly fragmented exit channels produced by the decay of excited 24Mg projectiles were detected. The longitudinal velocity spectra of protons and alpha particles from such channels are offset. This offset is consistent with post-breakup Coulomb accelerations from the 197Au target nuclei implying that the protons were emitted within 3 X 10−22 s after the target-projectile separation.

Electromagnetic Dissociation Of 238u At 120 Mev/A, M. L. Justice, Y. Blumenfeld, N. Colonna, D. N. Delis, G. Guarino, K. Hanold, J. C. Meng, Graham F. Peaslee, G. J. Wozniak, L. G. Moretto

Faculty Publications

Electromagnetic fission cross sections of a 120 MeV/nucleon U238 beam incident on five targets, Be9, Al27, Cunat, Agnat, and Unat, have been extracted from measurements of projectile velocity fission fragments. The nuclear interaction contributions to the experimentally observed cross sections were determined by extrapolation from the Be target data using a geometrical scaling model and by an empirical decomposition of the fission charge distributions. The results are compared to model calculations in which electric quadrupole excitations have been included.

1994 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie

Data Sets

The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 1994.

Tamias Rufus, Stephanie L. Burt, Troy L. Best

Canyonlands Research Bibliography

No abstract provided.

Vandalism Of Rock Art For Enhanced Photography, S. D. Chaffee, M. Hyman, M. W. Rowe

Canyonlands Research Bibliography

Direct radiocarbon dating of pictographs has recently become possible. The authors report here the deleterious effects on such dating of hydrocarbon contamination of a pictograph in southeastern Utah. In order to enhance contrast between a pictograph and its rock substrate, some photographers have wetted pictographs with kerosene or similar substances; such 'enhancement' renders radiocarbon dates useless. Some treatments proposed for rock art deterioration may cause similar problems.

1994 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group

Images

The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 1994.

Chesapeake Bay Atlas, Us Epa Monitoring Program Water Quality Data 1984-1991, Sarah E. Rennie, Bruce Neilson

Data

The original data is in the folder RAWDATA under the folder DOSISO. Within RAWDATA there are 3 subdirectories : TSOPH holds temperature, salinity, diss.O2 and pH. WQ9 h

olds Chl-A, PO4,TotalN, NH4, Nitrate, Si, TOC, TSS & TotalP WQ6 holds DissInorgN, NO2, Part.PHOS, Part.C, Part.N, and TDissN The original measurements are held in columnar ASCII text files suitable for importing into spreadsheets (columns separated by spaces, not tabs). The files are arranged in subdirectories by water year (October through September). The data is as it came from the US EPA Chesapeake Bay Program Office in Annapolis (CSC) in November 1992. …

Foliations Transverse To Fibers Of Seifert Manifolds, Ramin Naimi

Ramin Naimi

No abstract provided.

Graphical Event-Directed Scenario Behavioral Specifications For The Scenario-Based Engineering Process (Sep) Using A Domain Specific Software Architecture (Assa) Philosophy, Miao Xia

Computer Science and Engineering Theses

This thesis extends scenarios of a system into real-time event digraphs. A scenario is an event trace resulting from a particular thread of system execution. An event digraph is an event network. Multiple external stimuli result in a wave of execution in distributed and parallel architecture. A graph theoretic formal definition for event digraphs is developed with the finite sets of events and the scenario event order (SEO). A scenario language is developed from the event digraph. In modeling an event digraph, we introduce the frontier expansion mechanism which let the users and the developers go around the question if …

Azimuthal Correlations As A Test For Centrality In Heavy Ion Collisions, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, G. F. Lynch, Graham F. Peaslee, R. T. De Souza, M. B. Tsang, C. Williams, F. Zhu, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak

Faculty Publications

Azimuthal correlations of particles emitted in collisions between 197Au target nuclei and projectiles 36Ar (at and 129Xe (at have been measured with the MSU Miniball, a 4π phoswich array with a low detection threshold. Various impact parameter filters, based on the charge-particle multiplicity, transverse energy and midrapidity charge are tested by their ability to suppress collective motion as measured by the azimuthal correlations. The usefulness of a directivity cut in selecting central collisions for these systems is evaluated.

Observation Of Lifetime Effects In Two-Proton Correlations For Well-Characterized Sources, M. A. Lisa, C. K. Gelgke, P. Decowski, W. G. Gong, E. Gualtieri, S. Hannuschke, R. Lacey, T. Li, W. G. Lynch, Graham F. Peaslee, S. Pratt, T. Reposeur, A. M. Vander Molen, G. D. Westfall, J. Yee, S. J. Yennello

Faculty Publications

Differences between longitudinal and transverse two-proton correlation functions, consistent with finite lifetime effects, are observed for central Ar36+45Sc collisions at E/A=80 MeV. The correlations between two protons emitted with low total momenta are consistent with emission from a source of Gaussian radius r0≊4.7±0.3 fm and characteristic lifetime τ≊25±15 fm/c.

The Onset Of Nuclear Vaporization, M. B. Tsang, W. C. Hsi, W. G. Lynch, D. R. Bowman, C. K. Gelbke, M. A. Lisa, Graham F. Peaslee, G. J. Kunde, M. L. Begemann-Blaich, T. Hoffman, J. Hubele, J. Kempter, P. Kreutz, W. D. Kunze, V. Lindenstruth, U. Lynen, M. Mang, W. F.J. Müller, M. Neumann, B. Ocker, C. A. Ogilvie, J. Pochodzalla, F. Rosenberger, H. Sann, A. Schüttauf, V. Serfling, J. Stroth, W. Trautmann, A. Tucholski, A. Wörner, E. Zude, B. Zwieglinski, S. Aiello, G. Immé, V. Pappalardo, G. Raciti, R. J. Charity, L. G. Sobotka

Faculty Publications

Multifragmentation has been measured for Au197+197Au collisions at E/A=100, 250, and 400 MeV. The mean fragment multiplicity increases monotonically with the charged particle multiplicity at E/A=100 MeV, but decreases for central collisions with incident energy, consistent with the onset of nuclear vaporization. Molecular dynamics calculations follow some trends but underpredict the observed fragment multiplicities. Including the statistical decay of excited residues improves the agreement for peripheral collisions but worsens it for central collisions.

Transition From Complete To Incomplete Fusion In Asymmetric Heavy Ion Reactions, K. Hanold, L. G. Moretto, Graham F. Peaslee, G. J. Wozniak, D. R. Bowman, M. F. Mohar, D. J. Morrissey

Faculty Publications

Complex fragments with atomic numbers between those of the target and the projectile have been detected from the reactions of 26 and 31 MeV/nucleon Xe129+C, Al, Ti, and Cu. Angular distributions, cross sections, and velocity spectra of these fragments were extracted from the inclusive data. The velocity of the emitting source and Z-total distributions were reconstructed from the twofold coincidence data. These results are used to characterize the emission source of the complex fragments. The results are compared to a geometric incomplete fusion model calculation. Agreement between the model and the data is good.

Impact-Parameter-Selected Two-Proton Intensity Interferometry For 36ar + 45sc At E/A=80 Mev, M. A. Lisa, C. K. Gelbke, W. Bauer, P. Decowski, W. G. Gong, E. Gualtieri, S. Hannuschke, R. Lacey, T. Li, W. G. Lynch, C. M. Mader, Graham F. Peaslee, T. Reposeur, A. M. Vander Molen, G. D. Westfall, J. Yee, S. J. Yennello

Faculty Publications

The momentum dependence of the two-proton correlation function is studied for central and peripheral Ar36+45Sc collisions at E/A=80 MeV. Calculations with the Boltzmann-Uehling-Uhlenbeck transport theory reproduce well the measured momentum dependence of the correlation functions for central collisions, but underpredict the momentum dependence for peripheral collisions.

Sources And Emission Time Scales In E/A=50 Mev 129xe + Natcu Reactions, D. R. Bowman, Graham F. Peaslee, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto

Faculty Publications

Velocity distributions and fragment-fragment correlation functions have been measured as a function of charged particle multiplicity for Xe129+natCu collisions at E/A=50 MeV. With increasing multiplicity, the velocity distributions evolve from a pattern exhibiting targetlike and projectilelike sources to an anisotropic distribution centered near the projectile-target center-of-mass velocity. Emission times extracted from the correlation functions are consistent with the decay of a projectilelike source in low multiplicity collisions, but the time scale for fragment emission in the high multiplicity collisions is too short for a separation of sources to occur.

Synthesis Of N-Boc-3-Azabicyclo[3.3.0]Octan-7-One Via Reductive Pauson-Khand Cyclization And Subsequent Conversion To A Novel Diazatricyclic Ring System, Daniel Becker, Daniel L. Flynn

Chemistry: Faculty Publications and Other Works

An intramolecular reductive Pauson-Khand reaction of the hexacarbonyldicobalt complex of N-(tert-butyloxycarbonyl)allylpropargylamine under dry-state adsorption conditions directly afforded the saturated N-BOC-3-azabicyclo[3.3.0]octan-7-one when the reaction was performed under an inert atmosphere. This bicyclic ketone was converted in several steps to the novel octahydro-1-azeto[2′,3′:3,4]cyclopenta[1,2-C]pyrrole ring system as confirmed by single crystal X-ray analysis.

Studies Of The Solid-Phase Pauson-Khand Reaction Selective In-Situ Enone Reduction To 3-Azabicyclo[3.3.0]Oct-Anones, Daniel Becker, Daniel L. Flynn

Chemistry: Faculty Publications and Other Works

The Smit-Caple DSAC Pauson-Khand cyclization of a series of N-protected allyl propargyl amines in the absence of oxygen gave rise to formation of the saturated azabicyclo[3.3.0]octanones in excellent yields. Standard cyclization in air gave mixtures of saturated and unsaturated ketones.

Multifragment Emission In 36ar +197au And 129xe + 197au Collisions, W. Bauer, D. R. Bowman, N. Carlin, N. Colonna, R. T. De Souza, C. K. Gelbke, W. G. Gong, K. Hanold, Y. D. Kim, M. A. Lisa, W. G. Lynch, M. A. Mcmahan, L. G. Moretto, Graham F. Peaslee, L. Phair, M. B. Tsang, C. Williams, G. J. Wozniak, F. Zhu

Faculty Publications

Multifragment disintegrations observed in 36Ar+197Au and 129Xe+197Au collisions are compared with theoretical predictions.

Expansion Effects In Intermediate Energy Heavy-Ion Reactions, R. T. De Souza, D. Fox, W. A. Friedman, L. Phair, D. R. Bowman, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, F. Zhu

Faculty Publications

Transverse kinetic energy spectra of fragments in the reaction 36Ar + 197Au are used to probe the multifragmentation mechanism at intermediate energies. The mass dependence of the average transverse kinetic energy is examined in the context of the statistical decay of an expanding, emitting source. The role of source expansion during emission is explored. Results suggest the onset of volume emission at the highest incident energy.

Extraction Of The Multifragmentation Time Scale In Intermediate Energy Heavy-Ion Reactions, D. Fox, R. T. De Souza, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, F. Zhu

Faculty Publications

The spatial and temporal extent of a system decaying by multifragment emission is deduced. Two-particle intermediate mass fragment correlation functions measured for central Ar36+197Au collisions at E/A=50–110 MeV indicate a rapid decay, <75 fm/c, of the highly excited system. Furthermore, the behavior of the correlation function at large relative velocities suggests that considerable charge loss occurs prior to fragment emission.

Complex Fragment Production In 139la-Induced Reactions At 35, 40, 45, And 55 Mev/Nucleon, P. Roussel-Chomaz, N. Colonna, Y. Blumenfeld, B. Libby, Graham F. Peaslee, D. N. Delis, K. Hanold, M. A. Mcmahan, J. C. Meng, Q. C. Sui, G. J. Wozniak, L, G. Moretto, H. Madani, A. A. Marchetti, A. C. Mignery, G. Guarino, N. Santoruvo, I. Iori, S. Bradley

Faculty Publications

Complex fragment emission (Z>3) has been studied in the reactions of 35, 40, 45 and 55 MeV/u139La+X. Charge, angular, and energy distributions were measured inclusively and in coincidence with other complex fragments, and were used to extract source rapidities, velocity distributions, and cross sectins. Multifragment events increase with both bombarding energy and entrance-channel mass asymmetry. The excitation functions for multifragment events rise strongly with excitation energy. These excitation functions are independent of the target-projectile combination and bombarding energy suggesting, the formation of an intermediate nuclear system, whose decay properties depend mainly on its excitation energy and angular momentum.

1993 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie

Data Sets

The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 1993.

1993 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group

Images

The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 1993.

Revegetation Of Disturbed Semiarid Grassland In Canyonlands National Park, Susan B. Goldberg

Canyonlands Research Bibliography

A grassland restoration project was conducted in Canyonlands National Park on an area recently disturbed due to construction. Two native grasses (Oryzopsis hymenoides and Stipa comata) were seeded with 18 different soil treatments. Stipa density and relative mycorrhizal colonization were measured. None of the soil treatments resulted in significantly greater Stipa density than the control treatment of seeding only plus water. There was very little correlation between Stipa density and mycorrhizal colonization based on the treatments (r2= 0.011 p = 0.05). Three treatments produced 3 to 5 times the VAN colonization as the control including spring cryptobiotic soil crusts, with …

Intermediate Mass Fragment Emission As A Probe Of Nuclear Dynamics, D. R. Bowman, C. M. Mader, Graham F. Peaslee, W. Bauer, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto, W. A. Friedman

Faculty Publications

Element distributions and fragment multiplicity distributions have been measured for E/A=50 MeV Xe129+12C, Al27, V51, Cunat, Y89, and Au197 reactions using a low threshold 4π detector. Both distributions show a strong correlation with the detected charged particle multiplicity and a large degree of target independence. The measured distributions are compared with hybrid model calculations which incorporate important dynamical aspects in both the preequilibrium and statistical emission phases. Results of these calculations are in reasonable agreement with the data. However, uncertainties with regard to the compressibility of nuclear matter remain due to uncertainties in the coupling of the two models.

Impact Parameter Filters For 36ar + 197au Collisions At E/A = 50, 80 And 110 Mev, L. Phair, D. R. Bowman, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, R. T. De Souza, M. B. Tsang, F. Zhu

Faculty Publications

Collisions between 36Ar projectiles and 197Au target nuclei at have been studied with the MSU Miniball, a 4π phoswich array with a low detection threshold. Various impact-parameter filters, based upon total charged-particle multiplicity, transverse energy, midrapidity charge and multiplicity of emitted hydrogen nuclei, are compared and cross-correlated. The relative selectivity of each prescription for small impact-parameter collisions is evaluated by assessing the suppression of fast-particle emission at forward angles.