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10. Long-term crop residue dynamics in no-till cropping systems under semi-arid conditions

Author

Cantero-Martinez, C., Westfall, D.G., Sherrod, L.A., and Peterson, G.A.

Subjects
Crop rotation -- Research, Cropping systems -- Research, Dry farming -- Research, Environmental issues, Research
Abstract

Crop residues are a valuable resource that is vitally important for maintaining and developing soil quality and productivity (Kumar and Goh, 2000). According to Lal (1995), the world production of [...]

Published
2006

11. Soil organic carbon pools after 12 years in no-till dryland agroecosystems

Author

Sherrod, L.A., Peterson, G.A., Westfall, D.G., and Ahuja, L.R.

Subjects
Soil biology -- Research, Soil chemistry -- Research, Soil science -- Research, Earth sciences
Abstract

Previous studies of no-till management in the Great Plains have shown that increased cropping intensity increased soil organic carbon (SOC). The objectives of this study were to (i) determine which soil C pools (active, slow, and passive) were impacted by cropping intensity after 12 yr of no-till across potential evapotranspiration (PET) and slope position gradients; (ii) relate C pool sizes to the levels found in total SOC; and (iii) determine C pool sizes relative to C levels found in a grass treatment (G). Cropping systems were wheat (Triticum aestivum)-fallow (WF), wheat-corn (Zea mays L.)-fallow (WCF), wheat-corn-millet (Panicum miliaceum)-fallow (WCMF), and continuous cropping (CC) at three PET sites in Colorado. Active C (Soil microbial biomass C [SMBC]); and slow pool C (particulate organic matter C; POM-C) increased as cropping intensity increased, dependent on PET. Passive C (mineral associated organic C [MAOC]) was strongly influenced by a site-by-slope position interaction but not by cropping system. Toeslope soils had 35% higher POM-C compared with summits and sideslopes. All C pools were strongly correlated with total SOC, with the variability decreasing as C pool turnover time increased. Carbon pool sizes in cropping systems relative to levels found in G were independently influenced by cropping system. The highest were found in the CC system, which had 91, 78, and 90% of the amounts of C found in the perennial G system in the active, slow, and passive C pools, respectively.

Published
2005

12. Cropping intensity enhances soil organic carbon and nitrogen in a no-till agroecosystem

Author

Sherrod, L.A., Peterson, G.A., Westfall, D.G., and Ahuja, L.R.

Subjects
Soils -- Carbon content, No-tillage -- Environmental aspects, Earth sciences
Abstract

Soil organic C (SOC) has decreased under cultivated wheat (Triticum aestivum)-fallow (WF) in the central Great Plains. We evaluated the effect of no-till systems of WF, wheat--corn (Zea Mays)-fallow (WCF), wheat-corn-millet (Panicum miliaceum)-fallow, continuous cropping (CC) without monoculture, and perennial grass (G) on SOC and total N (TN) levels after 12 yr at three eastern Colorado locations. Locations have long-term precipitation averages of 420 mm but increase in potential evapotranspiration (PET) going from north to south. Within each PET location, cropping systems were imposed across a topographic sequence of summit, sideslope, and toeslope. Cropping intensity, slope position, and PET gradient (location) independently impacted SOC and TN to a 5-cm soil depth. Continuous cropping had 35 and 17% more SOC and TN, respectively, than the WF system. Cropping intensity still impacted SOC and TN when summed to 10 cm with CC > than WF. Soil organic C and TN increased 20% in the CC system compared with WF in the 0- to 10-cm depth. The greatest impact was found in the 0- to 2.5-cm layer, and decreased with depth. Soil organic C and TN levels at the high PET site were 50% less than at the low and medium PET sites, and toeslope soils were 30% greater than summit and sideslopes. Annualized stover biomass explained 80% of the variation in SOC and TN in the 0- to 10-cm soil profile. Cropping systems that eliminate summer fallowing are maximizing the amount of SOC and TN sequestered.

Published
2003

13. Surface soil physical properties after twelve years of dryland no-till management

Author

Shaver, T.M., Peterson, G.A., Ahuja, L.R., Westfall, D.G., Sherrod, L.A., and Dunn, G.

Subjects
Soil science -- Research, No-tillage -- Research, Arid regions agriculture -- Research, Earth sciences
Abstract

Water is the principle limiting factor in dryland cropping systems. Surface soil physical properties influence infiltration and cropping systems under no-till management may affect these properties through residue addition. The objectives of this study were: (i) to determine how cropping intensity and topographic position affect soil bulk density, porosity, sorptivity, and aggregate stability in the surface 2.5 cm of soils at three eastern Colorado sites; and (ii) to relate these properties to crop residue returned to the soil surface. No-till cropping systems had been in place on three slope positions, at three sites, for 12 yr prior to this study. Wheat (Triticum aestivum L.)-corn (Zea mays L.)-fallow (WCF) and continuous cropping (CC) systems were compared with wheat-fallow (WF) on summit and toeslope positions at two sites (Sterling and Stratton), and at the third site (Walsh) wheat-sorghum [Sorghum bicolor (L.) Moench]-fallow (WSF) replaced WCF. Cropping systems (CC and WCF or WSF) that returned more crop residue decreased bulk density and increased total and effective porosities compared with WF. Site and slope positions that produced more crop residue also improved these properties. However, sorptivity developed no significant differences as a result of cropping system. Macroaggregates made up a higher percentage of total aggregates in CC and WCF or WSF compared with WF in proportion to residue added and were also a function of clay content of the soil at different sites and slope positions. These factors enhance the potential for greater infiltration and hence greater water availability for crops.

Published
2002

14. Inorganic carbon analysis by modified pressure-calcimeter method. (Division S-8--Nutrient Management & Soil & Plant Analysis)

Author

Sherrod, L.A., Dunn, G., Peterson, G.A., and Kolberg, R.L.

Subjects
Soils -- Carbon content, Earth sciences
Abstract

Soil organic C (SOC) analyses using high temperature induction furnace combustion methods have become increasing popular because of advances in instrumentation. Combustion methods, however, also include C from CaC[O.sub.3] and CaMg[(C[O.sub.3]).sub.2] found in calcareous soils. Separate analysis of the inorganic C (IC) must be done to correct C data from combustion methods. Our objective was to develop a efficient and precise IC method by modification of the pressure-calcimeter method. We modified the method by using Wheaton serum bottles (20-mL and 100-mL) sealed with butyl rubber stoppers and aluminum tear-off seals as the reaction vessel and a pressure transducer monitored by a digital voltmeter. Our gravimetric IC determination of six soils showed a strong correlation when regressed against IC from the modified pressure-calcimeter method (slope of 0.99, [r.sup.2] = 0.998). The method detection limit (MDL) was 0.17 g IC [kg.sup.-1] for the 20-mL serum bottles and the limit of quantification (LOQ) was 0.30 g IC [kg.sup.-1]. The 100-mL serum bottle had a MDL of 0.42 with a LOQ of 2.4 g IC [kg.sup.-1]. When using a 100-mL Wheaton serum bottle as the reaction vessel with a 0.50-g sample size, soils containing up to 120 g IC [kg.sup.-1], which represent a 100% CaC[O.sub.3] equivalent, can be analyzed within the V output range of the pressure transducer. Soil organic C determined by subtraction of IC from total C from combustion analysis correlated well with SOC determined by the Walkley-Black.

Published
2002

16. Influence of cropping intensity and nitrogen fertilizer rates on in situ nitrogen mineralization

Author

Kolberg, R.L., Westfall, D.G., and Peterson, G.A.

Subjects
Soils -- Nitrogen content, Biomineralization -- Research, Nitrogen fertilizers -- Environmental aspects, Cropping systems -- Research, Nitrogen in agriculture -- Research, Earth sciences
Abstract

Cycling of N through an agroecosystem can be managed more effectively if effects of N management and cropping sequence on soil N microbial processes are understood. Effects of cropping intensity and N fertilizer rate on net soil N mineralization were studied as well as their correlation with precipitation, air temperature and soil water content. Net soil N mineralization was measured by incubating undisturbed soil cores (15-cm depth) containing anion and cation exchange resins at their bottoms. Cores were incubated during each of five time periods (3-4 wk each) during the fallow phase (mid-April to mid-September) of two no-till cropping systems, wheat (Triticum aestivum L.)-fallow (WF) and wheat-corn (Zea mays L.)- fallow (WCF). Past N fertilizer applications were over four rates with total amounts applied during the previous 6 yr of 0, 95, 190, and 286 kg N [ha.sup.-1] in WF and 0, 134, 269, and 403 kg N [ha.sup.-1] in WCF. Soils were an Acidic Paleustoll at Sterling and an Aridic Argiustoll at Stratton in eastern Colorado. Total net N mineralization in WCF was half that in WF (22 vs. 43 kg N [ha.sup.-1]; 2-site average), probably due to greater immobilization as evidenced by nearly three times greater accumulation of crop residue on the soil surface after 6 yr of no-till management. Greater conservation of applied N and soil N can be expected in the more intensive WCF system. Total mineralized N increased with N rate by [approximately equal to] 0.2 kg [ha.sup.-1] for each kg [ha.sup.-1] of previously applied N. Precipitation in combination with air temperature and their interaction term gave the best prediction of average daily N mineralization at both sites.

Published
1999

19. Soil water storage in dryland cropping systems: the significance of cropping intensification

Author

Farahani, H.J., Peterson, G.A., Westfall, D.G., Sherrod, L.A., and Ahuja, L.R.

Subjects
Soil moisture -- Research, Arid regions agriculture -- Research, Cropping systems -- Research, Water-storage -- Research, Earth sciences
Abstract

Soil and water conservation is essential to the sustainability of Great Plains dryland agriculture. We hypothesized that cropping intensification improves the efficient use of precipitation. We evaluated long-term observations of soil water at three locations in eastern Colorado for a range of pan evaporations (1050-1900 mm), soils, and cropping systems. Soils at various locations were mostly of the Argiustoll subgroup except for one Ustochrept and one Haplargid, both at the higher evaporation location. Normal precipitation at the three locations ranges from 400 to 425 mm [yr.sup.-1]. Systems included a 2-yr winter wheat (Triticum aestivum L.)-fallow (WF) and more intense 3-yr winter wheat-corn (Zea mays L.)-fallow and winter wheat-sorghum [Sorghum bicolor (L.) Moench]-fallow and 4-yr rotations. To quantify the effectiveness of the intensified systems at utilizing precipitation, we introduce the System-Precipitation-Storage Index (SPSI) and System-Precipitation-Use Index (SPUI). Mean SPSI values were 0.19 and 0.28 for 2- and 3-yr systems, respectively, meaning that the fallow periods in the 3-yr rotation were collectively 47% more efficient at storing precipitation than fallow in WF. Inclusion of a summer crop, such as corn or sorghum, increased the fraction of precipitation allocated to growing-season crop production (i.e., SPUI) from 0.43 in WF to 0.56 (i.e., an increase of 30%) in 3-yr systems. The gains in efficient use of precipitation with intensification resulted from (i) reducing the frequency of the inefficient fallow preceding wheat, and (ii) using water for transpiration that would otherwise be lost during fallow through soil evaporation, runoff, and deep percolation.

Published
1998

20. Carbon isotope ratios of Great Plains soils and in wheat-fallow systems

Author

Follet, R.F., Paul, E.A., Leavitt, S.W., Havorson, A.D., Lyon, D., and Peterson, G.A.

Subjects
Great Plains -- Environmental aspects, Radiocarbon dating -- Research, Soils -- Composition, Humus -- Research, Agriculture -- Canada, Earth sciences
Abstract

The purposes of this study were to improve knowledge of regional vegetation patterns of [C.sub.3] and [C.sub.4] plants in the North American Great Plains and to use [Delta]13C methodology and long-term research sites to determine contributions of small-grain crops to total soil organic carbon (SOC) now present. Archived and recent soil samples were used. Detailed soil sampling was in 1993 at long-term sites near Akron, CO, and Sidney, NE. After soil sieving, drying, and deliming, SOC and [Delta]13C were determined using an automated C/N analyzer interfaced to an isotope-ratio mass spectrometer. Yield records from long-term experimental sites were used to estimate the amount of [C.sub.3] plant residue C returned to the soil. Results from [Delta]13C analyses of soils from near Waldheim, Saskatchewan, to Big Springs, TX, showed a strong north to south decrease in SOC derived from [C.sub.3] plants and a corresponding increase from [C.sub.4] plants. The [Delta]13C analyses gave evidence that [C.sub.3] plant residue C (possibly from shrubs) is increasing at the Big Springs, TX, and Lawton, OK, sites. Also, [Delta]13C analyses of subsoil and topsoil layers shows evidence of a regional shift to more [C.sub.3] species, possibly because of a cooler climate during the past few hundreds to thousands of years. Data from long-term research sites indicate that the efficiency of incorporation of small-grain crop residue C was about 5.4% during 84 yr at Akron, CO, and about 10.5% during 20 yr at Sidney, NE. The 14C age of the SOC at 0- to 10-cm depth was 193 yr and at 30 to 45 cm was 4000 yr: 14C age of nonhydrolyzable C was 2000 and 7000 yr for these same two respective depths. Natural partitioning of the 13C isotope by the photosynthetic pathways of [C.sub.3] and [C.sub.4] plants provides a potentially powerful tool to study SOC dynamics at both regional and local scales.

Published
1997

21. Radiocarbon dating for determination of soil organic matter pool sizes and dynamics

Author

Paul, E.A., Follet, R.F., Leavitt, S.W., Halvorson, A., Peterson, G.A., and Lyon, D.J.

Subjects
Humus -- Analysis, Radiocarbon dating -- Research, Soils -- Composition, Earth sciences
Abstract

The size and turnover rate of the resistant soil organic matter (SOM) fractions were measured by 14C dating and 13C/12C measurements. This involved soils archived in 1948, and recent samples, from a series of long-term sites in the North American Great Plains. A reevaluation of C dates obtained in the 1960s expanded the study scope. The 14C ages of surface soils were modern in some native sites and near modern in the low, moist areas of the landscape. They were much older at the catena summits. The 14C ages were not related to latitude although this strongly influenced the total SOM content. Cultivation resulted in lower C contents and increased the 14C age by an average of 900 yr. The 10- to 20-cm depths from both cultivated and native sites were 1200 yr older than the 0- to 10-cm depth. The 90- to 120-cm depth of a cultivated site at 7015 yr before present (BP) was 6000 yr older than the surface. The nonhydrolyzable C of this depth dated 9035 yr BP. The residue of 6 M HCl hydrolysis comprised 23 to 70% of the total soil C and was, on the average, 1500 yr older. The percentage of nonhydrolyzable C and its 14C age analytically identify the amount and turnover rate of the old resistant soil C.

Published
1997

22. Evaluation of an in situ net soil nitrogen mineralization method in dryland agroecosystems

Author

Kolberg, R.L., Rouppet, B., Westfall, D.G., and Peterson, G.A.

Subjects
Biomineralization -- Analysis, Soils -- Nitrogen content, Agricultural systems -- Environmental aspects, Dry farming -- Management, Earth sciences
Abstract

Direct quantitative measurement of soil net N mineralization in agricultural soils under field conditions has not been widely used. A potential method of in situ net N mineralization was investigated in the fallow phase of a 3-yr no-till crop rotation at two sites. Undisturbed soil cores (5 by 15 cm) with anion- and cation-exchange resins (Sybron Ionac ASB-1P and C-249) at the bottom were incubated in situ. Nitrate-N plus N[H.sub.[4.sup.+]]-N extracted from soil was added to extracted amounts from resin bags to determine net N mineralized during each of three incubation periods (3-4 wk each). Total net N mineralization was 33.7 and 26.5 kg N [ha.sup.-1] during 84 and 75 d of incubation at Sterling and Stratton, respectively. Relative amounts of resin did not affect N captured but cores placed midway between old corn (Zea Mays L.) rows tended to accumulate more (P > F = 0.13) N than cores placed in rows. This in situ method appears to be a reliable method for measuring net N mineralization in the field; however, variation is large and many observations are required to obtain net N mineralization rates within an acceptable confidence interval.

Published
1997

23. Water storage efficiency in no-till dryland cropping systems

Author

McGee, E.A., Peterson, G.A., and Westfall, D.G.

Subjects
Arid regions -- Research, Irrigation -- Research, Cropping systems -- Research, Dry farming -- Research, Environmental issues, Research
Abstract

Conventionally tilled wheat-fallow (W-F) is the predominant cropping system in the semiarid Great Plains. The primary purpose of summer following has been to store water in the soil for the [...]

Published
1997

25. List of Contributors

Author

Alexander, R.B., primary, Baltensperger, David D., additional, Bannink, André, additional, Blumenthal, Jürg M., additional, Boers, P., additional, Brahana, J.V., additional, Burkart, Michael R., additional, Cabot, Perry E., additional, Cassman, Kenneth G., additional, Cutforth, Laurence B., additional, Delgado, Jorge A., additional, Grosso, S.J. Del, additional, Follett, Jennifer R., additional, Follett, Ronald F., additional, Goss, M.J., additional, Goulding, K.W.T., additional, Hartman, M.D., additional, Hatfield, J.L., additional, Hess, Philip J., additional, Hoffmann, C.C., additional, Hunter, W.J., additional, Jensen, J.P., additional, Joern, Brad C., additional, Kahn, Bruce M., additional, Keeney, D.R., additional, Kelly, John R., additional, Keough, C.A., additional, Kitchen, N.R., additional, Kronvang, B., additional, Lory, John A., additional, McMullen, L.D., additional, Manale, Andrew P., additional, Mason, Stephen C., additional, Mosier, A.R., additional, Nadelhoffer, K.J., additional, Nowak, Pete J., additional, Oenema, Oene, additional, Ojima, D.S., additional, Parton, W.J., additional, Pavlista, Alexander D., additional, Peterson, G.A., additional, Randall, G.W., additional, Sauer, T.J., additional, Schimel, D.S., additional, Shaffer, Marvin J., additional, Smith, R.A., additional, Sommer, Sven G., additional, Stoner, Jeffrey D., additional, and Velthof, Gerard L., additional

Published
2001
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26. Agroecosystem approach to soil and crop management research

Author

Peterson, G.A., Westfall, D.G., and Cole, C.V.

Subjects
Soil management -- Research, Agricultural research -- Economic aspects, Earth sciences
Abstract

The cause and effect which accompanies reductionism is determined by the use of advances in agronomic sciences. Though a large amount of research has been done in this field, the results have not been properly interpreted and applied. The results find applications in solving problems in landscape level researches. System approach to the study of soil and crop management is more advantageous to present methods which deal with agricultural problems. The problem is common to the one applied to the ecosystem of the great plains.

Published
1993

27. Soil attribute prediction using terrain analysis

Author

Moore, I.D., Gessler, P.E., Nielsen, G.A., and Peterson, G.A.

Subjects
Soil structure -- Research, Soil formation -- Analysis, Water -- Analysis, Earth sciences
Abstract

This study is based on the hypothesis that catenary soil development occurs in many landscapes in response to the way water moves through and over the landscape. Furthermore, terrain attributes can characterize these flow paths and, therefore, soil attributes. Significant correlations between quantified terrain attributes and measured soil attributes were found on a 5.4-ha toposequence in Colorado. Slope and wetness index were the terrain attributes most highly correlated with surface soil attributes measured at 231 locations on a 15.24-m grid. Individually, they accounted for about one-half of the variability in A horizon thickness, organic matter content, pH, extractable P, and silt and sand contents. This represents an incorporation of finer scale process-based information relating to soil formation patterns in the landscape. The computed and measured ranges of terrain and soil attributes, respectively, can be used to enhance an existing soil map, even when the exact form of the relationship is unknown. As a first approximation, a linear relationship was assumed and the interpolated predictions of A horizon thickness and pH compared reasonably well with the observed. Such techniques may also be applied as a first step in unmapped areas to guide soil sampling and model development.

Published
1993

30. Inclusive hadron photoproduction from longitudinally polarized protons and deuterons

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bültmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O.A., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Lorant, S.St., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., and Zihlmann, B.

Published
1999
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31. Measurement of the proton and deuteron spin structure functions g2 and asymmetry A2

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bültmann, S.L., Buenerd, M., Chupp, T.E., Churchwell, S., Court, G., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B., Reyna, D., Rochester, L.S., Rock, S.E., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Lorant, S.St., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., and Zihlmann, B.

Published
1999
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32. Threshold electrodisintegration of 3He

Author

Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA, Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan, Institute of Physics, Jagellonian University, PL-30059 Kraców, Poland, MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949, USA, Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA, Institut für Theoretische Physik II, Ruhr Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, College of Radiology, Teikyo University, Tokyo 173-8605, Japan, Department of Physics, University of Arizona, Tucson, Arizona 85721, USA, Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, Nogga, A, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA, Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan, Institute of Physics, Jagellonian University, PL-30059 Kraców, Poland, MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949, USA, Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA, Institut für Theoretische Physik II, Ruhr Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu 804-8550, Japan, College of Radiology, Teikyo University, Tokyo 173-8605, Japan, Department of Physics, University of Arizona, Tucson, Arizona 85721, USA, Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, and Nogga, A

Abstract

type:Journal Article, Cross sections were measured for the near-threshold electrodisintegration of 3He at momentum transfer values of q=2.4, 4.4, and 4.7 fm-1. From these and prior measurements the transverse and longitudinal response functions RT and RL were deduced. Comparisons are made against previously published and new nonrelativistic A=3 calculations using the best available nucleon-nucleon NN potentials. In general, for q<2 fm-1 these calculations accurately predict the threshold electrodisintegration of 3He. Agreement at increasing q demands consideration of two-body terms, but discrepancies still appear at the highest momentum transfers probed, perhaps due to the neglect of relativistic dynamics, or to the underestimation of high-momentum wave-function components., source:http://link.aps.org/abstract/PRC/v67/e064004, source:http://www.aps.org

Published
2017

38. Threshold Electrodisintegration of ^3He

Author

Hicks, R.S., Hotta, A, Churchwell, S, Jiang, X, Peterson, G.A, Shaw, J, Asavapibhop, B, Berisso, M.C., Bosted, P.E., Burchesky, P.E, Miskimen, R.A, Rock, S.E, Nakagawa, I, Tamae, T, Suda, T, Golak, J, Skibinski, R, Witala, H, Casagrande, F, Turchinetz, W, Cichocki, A, Wang, K, Glockle, W, Kamada, Hiroyuki, Kobayashi, T, and Nogga, A

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Cross sections were measured for the near-threshold electrodisintegration of ^3He at momentum transfer values of q=2.4, 4.4, and 4.7 fm^{-1}. From these and prior measurements the transverse and longitudinal response functions R_T and R_L were deduced. Comparisons are made against previously published and new non-relativistic A=3 calculations using the best available NN potentials. In general, for q, 9 pages, 7 figures, 1 table, REVTEX4, submitted to Physical Review C

Published
2003
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39. $ep\rightarrow ep\pi^0$ reaction studied in the $\Delta$(1232)mass region using polarization asymmetries

Author

Biselli, A.S., Adams, G.S., Amaryan, M.J., Smith, L.C., Burkert, V.D., Minehart, R., Kuhn, S.E., Dodge, G.E., Forest, T.A., Taiuti, M., Anciant, E., Anghinolfi, M., Asavapibhop, B., Asryan, G., Audit, G., Auger, T., Avakian, H., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bertozzi, W., Bianchi, N., Boiarinov, S., Bosted, P., Bouchigny, S., Bradford, R., Branford, D., Brooks, W.K., Bueltmann, S., Butuceanu, C., Calarco, J.R., Carman, D.S., Carnahan, B., Cetina, C., Ciciani, L., Cole, P.L., Coleman, A., Connelly, J., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J.P., De Sanctis, E., De Vita, R., Degtyarenko, P.V., Demirchyan, R., Denizli, H., Dennis, L., Dharmawardane, K.V., Djalali, C., Domingo, J., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Eckhause, M., Efremenko, Y.V., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Farhi, L., Fatemi, R., Feuerbach, R.J., Ficenec, J., Fissum, K., Freyberger, A., Frolov, V., Funsten, H., Gaff, S.J., Gai, M., Gavalian, G., Gavrilov, V.B., Gilad, S., Gilfoyle, G.P., Giovanetti, K.L., Girard, Pascal, Golovatch, E., Gordon, C.I.O., Griffioen, K., Guidal, M., Guo, L., Guillo, M., Gyurjyan, V., Hancock, D., Hardie, J., Heddle, D., Heimberg, P., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ito, M.M., Jenkins, D., Joo, K., Keith, C., Kelley, J.H., Khandaker, M., Kim, K.Y., Kim, K., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Klusman, M., Kossov, M., Kramer, L.H., Kuang, Y., Kuhn, J., Lachniet, J., Laget, J.M., Lawrence, D., Leskin, G.A., Loukachine, K., Major, R.W., Manak, J.J., Marchand, C., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mirazita, M., Miskimen, R., Mokeev, V., Morrow, S., Muccifora, V., Mueller, J., Murphy, L.Y., Mutchler, G.S., Napolitano, J., Nelson, S.O., Niccolai, S., Niculescu, G., Niczyporuk, B., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Ohandjanyan, M.S., Opper, A., Ossipenko, M., Park, K., Patois, Y., Peterson, G.A., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Preedom, B.M., Price, J.W., Protopopescu, D., Qin, L.M., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Rock, S., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabourov, K., Salgado, C.W., Sapunenko, V., Sargsyan, M., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Shaw, J., Shuvalov, S.M., Simionatto, S., Skabelin, A., Smith, E.S., Smith, T., Sober, D.I., Sorrell, L., Spraker, M., Stepanyan, S., Stoler, P., Taylor, S., Tedeschi, D., Thoma, U., Thompson, R., Todor, L., Tung, T.Y., Tur, C., Vineyard, M.F., Vlassov, A.V., Wang, K., Weinstein, L.B., Weller, H., Welsh, R., Weygand, D.P., Whisnant, S., Witkowski, M., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Zhang, B., Zhao, J., Zhou, Z., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
2003

40. Exclusive electroproduction of $\phi$ mesons at 4.2 GeV - Corrected article Phys.Rev.C63,065205(2001)

Author

Lukashin, K., Smith, E.S., Adams, G.S., Anciant, E., Anghinolfi, M., Asavapibhop, B., Auger, T., Audit, G., Avakian, H., Ball, J., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bertozzi, W., Bianchi, N., Biselli, A., Boiarinov, S., Bonner, B.E., Bouchigny, S., Branford, D., Briscoe, W.J., Brooks, W., Burkert, V.D., Calarco, J.R., Carman, D.S., Carnahan, B., Ciciani, L., Clark, R., Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J., Degtyarenko, P.V., Dennis, L.C., De Sanctis, E., De Vita, R., Dhuga, K.S., Djalali, C., Dodge, G.E., Domingo, J., Doughty, D., Dragovitsch, P., Dytman, S., Eckause, M., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Fatemi, R., Feuerbach, R.J., Ficenec, J., Fissum, K., Forest, T.A., Freyberger, A., Funsten, H., Gaff, S., Gai, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K., Girard, Pascal, Griffioen, K.A., Guidal, M., Guillo, M., Gyurjyan, V., Hardie, J., Heddle, D., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ito, M.M., Jenkins, D., Joo, K., Kelley, J., Khandaker, M., Kim, W., Kim, K.Y., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Kramer, L.J., Kuhn, S E., Laget, J.M., Lawrence, D., Longhi, A., Manak, J.J., Marchand, C., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Muccifora, V., Mueller, J., Mutchler, G.S., Napolitano, J., Nelson, S., Niculescu, G., Niculescu, I., Niyazov, R.A., Opper, A., O'Rielly, G., O'Brien, J.T., Park, K., Paschke, K., Pasyuk, E., Peterson, G.A., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Qin, L.M., Raue, B.A., Reolon, A.R., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Sabourov, K., Salgado, C.W., Sapunenko, V., Schumacher, R.A., Serov, V., Sharabian, Y.G., Shaw, J., Simionatto, S., Skabelin, A., Smith, L.C., Sober, D.I., Stavinsky, A., Stepanyan, S., Stoler, P., Strakovsky, I.I., Taiuti, M., Taylor, S., Tedeschi, D., Thompson, R., Vineyard, M.F., Vlassov, A., Wang, K., Weller, H., Weinstein, L.B., Welsh, R., Weygand, D.P., Whisnant, S., Wolin, E., Yanik, L., Yegneswaran, A., Yun, J., Zhou, Z., Zhang, B., Zhao, J., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
2001

41. Electroproduction of the $\lambda$(1520) hyperon

Author

Barrow, S.P., Lukashin, K., Smith, E.S., Adams, G.S., Anciant, E., Anghinolfi, M., Asavapibhop, B., Auger, T., Audit, G., Avakian, H., Ball, J., Battaglieri, M., Beard, K., Bektasoglu, M., Bertozzi, W., Bianchi, N., Biselli, A., Boiarinov, S., Bonner, B.E., Bouchigny, S., Branford, D., Briscoe, W.J., Brooks, W., Burkert, V.D., Calarco, J.R., Carman, D.S., Carnahan, B., Ciciani, L., Clark, R., Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J., Degtyarenko, P.V., Dennis, L.C., De Sanctis, E., De Vita, R., Dhuga, K.S., Djalali, C., Dodge, G.E., Domingo, J., Doughty, D., Dragovitsch, P., Dytman, S., Eckause, M., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Fatemi, R., Feuerbach, R.J., Ficenec, J., Fissum, K., Forest, T.A., Freyberger, A., Funsten, H., Gaff, S., Gai, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K., Girard, Pascal, Griffioen, K.A., Guidal, M., Guillo, M., Gyurjyan, V., Hardie, J., Heddle, D., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ito, M.M., Jenkins, D., Joo, K., Kelley, J., Khandaker, M., Kim, W., Kim, K.Y., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Kramer, L.J., Kuhn, S E., Laget, J.M., Lawrence, D., Longhi, A., Manak, J.J., Marchand, C., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Muccifora, V., Mueller, J., Mutchler, G.S., Napolitano, J., Nelson, S., Niculescu, G., Niculescu, I., Niyazov, R.A., Opper, A., O'Rielly, G., O'Brien, J.T., Park, K., Paschke, K., Pasyuk, E., Peterson, G.A., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Qin, L.M., Raue, B.A., Reolon, A.R., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Sabourov, K., Salgado, C.W., Sapunenko, V., Schumacher, R.A., Serov, V., Sharabian, Y.G., Shaw, J., Simionatto, S., Skabelin, A., Smith, L.C., Sober, D.I., Stavinsky, A., Stepanyan, S., Stoler, P., Strakovsky, I.I., Taiuti, M., Taylor, S., Tedeschi, D., Thompson, R., Vineyard, M.F., Vlassov, A., Wang, K., Weller, H., Weinstein, L.B., Welsh, R., Weygand, D.P., Whisnant, S., Wolin, E., Yanik, L., Yegneswaran, A., Yun, J., Zhou, Z., Zhang, B., Zhao, J., Robert, Suzanne, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
2001

42. Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements

Author

Stepanyan, S., Burkert, V.D., Elouadrhiri, L., Adams, G.S., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Ball, J., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Berman, B.L., Bertin, P.Y., Bianchi, N., Biselli, A., Boiarinov, S., Bonner, B.E., Bouchigny, S., Branford, D., Briscoe, W.J., Brooks, W.K., Calarco, J.R., Carman, D.S., Carnahan, B., Cetina, C., Ciciani, L., Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J., Degtiarenko, P.V., Denizli, H., Dennis, L.C., De Sanctis, E., De Vita, R., Dharmawardane, K.V., Dhuga, K.S., Djalali, C., Dodge, G.E., Dore, D., Doughty, D., Dragovitsch, P., Dytman, S., Eckhause, M., Egiyan, H., Egiyan, K.S., Empl, A., Fatemi, R., Feldman, G., Feuerbach, R.J., Ficenec, J., Fissum, K., Forest, T.A., Freyberger, A.P., Funsten, H., Gaff, S., Gai, M., Garcon, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K., Girard, Pascal, Griffioen, K.A., Guidal, M., Guillo, M., Gyurjyan, V., Hadjidakis, C., Hardie, J., Heddle, D., Heimberg, P., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ito, M.M., Jenkins, D., Joo, K., Kelley, J., Khandaker, M., Kim, D.H., Kim, K., Kim, K.Y., Kim, W., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Kramer, L.H., Kuhn, S.E., Laget, J.M., Lawrence, D., Longhi, A., Lukashin, K., Manak, J.J., Marchand, C., Maximon, L., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Morand, L., Muccifora, V., Mueller, J., Murphy, L., Mutchler, G.S., Napolitano, J., Nelson, S., Niccolai, S., Niculescu, G., Niculescu, I., Niyazov, R.A., Opper, A., O'Rielly, G., O'Brien, J.T., Park, K., Pasyuk, E., Peterson, G.A., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Popa, I., Pozdniakov, S., Preedom, B.M., Price, J.W., Protopopescu, D., Qin, L.M., Raue, B.A., Reolon, A.R., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Sabourov, K., Salgado, C.W., Sapunenko, V., Schumacher, R.A., Serov, V., Shafi, A., Sharabian, Yu.G., Shaw, J., Simionatto, S., Skabelin, A., Smith, E.S., Smith, L.C., Sober, D.I., Stavinsky, A., Stoler, P., Strakovsky, I.I., Suleiman, R., Taiuti, M., Taylor, S., Tedeschi, D., Thompson, R., Todor, L., Vineyard, M.F., Vlassov, A., Wang, K., Weller, H., Weinstein, L.B., Welsh, R., Weygand, D.P., Whisnant, S., Wolin, E., Yanik, L., Yegneswaran, A., Yun, J., Zhao, J., Zhang, B., Zhou, Z., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Robert, Suzanne

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
2001

43. Photoproduction of phi(1020) mesons on the proton at large momentum transfer

Author

Anciant, E., Lukashin, K., Smith, E.S., Adams, G.S., Anghinolfi, M., Asavapibhop, B., Auger, T., Audit, G., Avakian, H., Ball, J., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bertozzi, W., Bianchi, N., Biselli, A., Boiarinov, S., Bonner, B.E., Bouchigny, S., Branford, D., Briscoe, W.J., Brooks, W., Burkert, V.D., Calarco, J.R., Carman, D.S., Carnahan, B., Ciciani, L., Clark, R., Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J., Degtyarenko, P.V., Dennis, L.C., de Sanctis, E., de Vita, R., Dhuga, K.S., Djalali, C., Dodge, G.E., Domingo, J., Doughty, D., Dragovitsch, P., Dytman, S., Eckause, M., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Fatemi, R., Feuerbach, R.J., Ficenec, J., Fissum, K., Forest, T.A., Freyberger, A., Funsten, H., Gaff, S., Gai, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K., Girard, Pascal, Griffioen, K.A., Guidal, M., Guillo, M., Gyurjyan, V., Hardie, J., Heddle, D., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ito, M.M., Jenkins, D., Joo, K., Kelley, J., Khandaker, M., Kim, W., Kim, K.Y., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Kramer, L.J., Kuhn, S E., Laget, J.M., Lawrence, D., Longhi, A., Manak, J.J., Marchand, C., Mcaleer, S., Mccarthy, J., Mcnabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Muccifora, V., Mueller, J., Mutchler, G.S., Napolitano, J., Nelson, S., Niculescu, G., Niculescu, I., Niyazov, R.A., Opper, A., O'Rielly, G., O'Brien, J.T., Park, K., Paschke, K., Pasyuk, E., Peterson, G.A., Philips, S., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Qin, L.M., Raue, B.A., Reolon, A.R., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Sabourov, K., Salgado, C.W., Sapunenko, V., Schumacher, R.A., Serov, V., Sharabian, Y.G., Shaw, J., Simionatto, S., Skabelin, A., Smith, L.C., Sober, D.I., Stavinsky, A., Stepanyan, S., Stoler, P., Strakovsky, I.I., Taiuti, M., Taylor, S., Tedeschi, D., Thompson, R., Vineyard, M.F., Vlassov, A., Wang, K., Weller, H., Weinstein, L.B., Welsh, R., Weygand, D.P., Whisnant, S., Wolin, E., Yanik, L., Yegneswaran, A., Yun, J., Zhou, Z., Zhang, B., Zhao, J., Robert, Suzanne, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS

Subjects
Quark, Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Momentum transfer, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Phi meson, 7. Clean energy, 01 natural sciences, Gluon, High Energy Physics - Experiment, Pomeron, Cross section (physics), High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

The cross section for $\phi$ meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer -t = 4 GeV^2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well described by Pomeron exchange. At large four-momentum transfer, above -t = 1.8 GeV^2, the data support a model where the Pomeron is resolved into its simplest component, two gluons, which may couple to any quark in the proton and in the $\phi$., Comment: 5 pages; 7 figures

Published
2000

44. Measurements of the $Q^2$ dependence of the proton and neutron spin structure functions $g^p_1$ and $g^n_1$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

he structure functions g1p and g1n have been measured over the range 0.014 < x < 0.9 and 1 < Q2 < 40 GeV2 using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q2 dependence of g1p (g1n) at fixed x is very similar to that of the spin-averaged structure function F1p (F1n). From a NLO QCD fit to all available data we find $\Gamma_1^p - \Gamma_1^n =0.176 \pm 0.003 \pm 0.007$ at Q2=5 GeV2, in agreement with the Bjorken sum rule prediction of 0.182 \pm 0.005.

Published
2000

45. Measurement of the deuteron spin structure function $g^{d}_1(x)$ for $1\ (GeV/c)^2 < Q^2 < 40\ (GeV/c)^2$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data obtained using lithium deuteride (6Li2H) as the target material. Extrapolations of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and the net quark polarization Delta Sigma.

Published
1999

46. Measurement of the proton and deuteron spin structure functions $g_{2}$ and asymmetry $A_{2}^{1}$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.K., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

48. Impact Of Intensive Cropping Systems On Physical Properties Of Surface Soils

Author

Peterson, G.A., Westfall, D.G., Sherrod, L.A., Shaver, T. M., Peterson, G.A., Westfall, D.G., Sherrod, L.A., and Shaver, T. M.

Abstract

The objective of this paper is to report the cumulative effects of cropping system intensification on the near surface soil physical properties (surface one inch of soil) within the Colorado dryland agroecoystem project, which has been in existence since 1986. Intensifying cropping systems from wheat-fallow to wheat-com-fallow to continuous cropping, increased crop residue return to the soil. Returning more residue to the soil surface: (I) decreased bulk density; (2) increased effective porosity; (3) increased sorptivity; (4) increased macro soil aggregation; and (5) appeared to improve potential water capture of the overall system. Increases in surface soil aggregation and effective porosity were linearly related to crop residue return. These data imply that long-term use of intensified cropping systems should result in improved soil physical conditions that will enhance overall system productivity.

Published
2002

50. Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

Author

Anthony, P.L., primary, Arnold, R.G., additional, Averett, T., additional, Band, H.R., additional, Benmouna, N., additional, Boeglin, W., additional, Borel, H., additional, Bosted, P.E., additional, Bültmann, S.L., additional, Court, G.R., additional, Crabb, D., additional, Day, D., additional, Decowski, P., additional, DePietro, P., additional, Egiyan, H., additional, Erbacher, R., additional, Erickson, R., additional, Fatemi, R., additional, Frlez, E., additional, Griffioen, K.A., additional, Harris, C., additional, Hughes, E.W., additional, Hyde-Wright, C., additional, Igo, G., additional, Johnson, J., additional, King, P., additional, Kramer, K., additional, Kuhn, S.E., additional, Lawrence, D., additional, Liang, Y., additional, Lindgren, R., additional, Lombard-Nelsen, R.M., additional, McKee, P., additional, McNulty, D.E., additional, Meyer, W., additional, Mitchell, G.S., additional, Mitchell, J., additional, Olson, M., additional, Penttila, S., additional, Peterson, G.A., additional, Pitthan, R., additional, Pocanic, D., additional, Prepost, R., additional, Prescott, C., additional, Raue, B.A., additional, Reyna, D., additional, Ryan, P., additional, Rochester, L.S., additional, Rock, S., additional, Rondon-Aramayo, O., additional, Sabatie, F., additional, Smith, T., additional, Sorrell, L., additional, Lorant, S.St., additional, Szalata, Z., additional, Terrien, Y., additional, Tobias, A., additional, Toole, T., additional, Trentalange, S., additional, Wesselmann, F.R., additional, Wright, T.R., additional, Zeier, M., additional, Zhu, H., additional, and Zihlmann, B., additional

Published
2003
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