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1,266 Matching Results
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Production of e+e- Pairs Accompanied by Nuclear Dissociation in Ultra-peripheral Heavy Ion Collisions
We present the first data on e{sup +}e{sup -} pair production accompanied by nuclear breakup in ultra-peripheral gold-gold collisions at a center of mass energy of 200 GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order corrections to the pair production cross section should be enhanced. We compare the pair kinematic distributions with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED); the latter includes the photon virtuality. The cross section, pair mass, rapidity and angular distributions are in good agreement with both calculations. The pair transverse momentum, p{sub T}, spectrum agrees with the QED calculation, but not with the equivalent photon approach. We set limits on higher-order contributions to the cross section. The e{sup +} and e{sup -} p{sub T} spectra are similar, with no evidence for interference effects due to higher-order diagrams.
Date:
April 7, 2004
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Allgower, C.; Amonett, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Open Charm Yields in d+Au Collisions at sqrt(sNN) = 200 GeV
Mid-rapidity open charm spectra from direct reconstruction of D{sup 0}({bar D}{sup 0}) {yields} K{sup {-+}} {pi}{sup {+-}} in d+Au collisions and indirect electron/positron measurements via charm semileptonic decays in p+p and d+Au collisions at {radical}s{sub NN} = 200 GeV are reported. The D{sup 0}({bar D}{sup 0}) spectrum covers a transverse momentum (p{sub T}) range of 0.1 < p{sub T} < 3 GeV/c whereas the electron spectra cover a range of 1 < p{sub T} < 4 GeV/c. The electron spectra show approximate binary collision scaling between p+p and d+Au collisions. From these two independent analyses, the differential cross section per nucleon-nucleon binary interaction at mid-rapidity for open charm production from d+Au collisions at RHIC is d{sigma}{sub c{bar c}}{sup NN}/dy = 0.30 {+-} 0.04 (stat.) {+-} 0.09(syst.) mb. The results are compared to theoretical calculations. Implications for charmonium results in A+A collisions are discussed.
Date:
January 7, 2005
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
The University News (Irving, Tex.), Vol. 43, No. 9, Ed. 1 Wednesday, November 7, 2018
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
November 7, 2018
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Toward a More Rational Design of the Direct Synthesis of Aniline: A Density Functional Theory Study
This article uses plane-wave density functional theory calculations to investigate the direct amination of benzene catalyzed by a Ni(111) surface to explore the reaction intermediates and to understand the role of nickel in this reaction.
Date:
March 24, 2017
Creator:
Alsunaidi, Zainab H. A.; Cundari, Thomas R., 1964- & Wilson, Angela K.
Object Type:
Article
System:
The UNT Digital Library
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 159, Ed. 1 Sunday, July 7, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 7, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 15, No. 33, Ed. 1 Friday, February 7, 1890
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
February 7, 1890
Creator:
Garrett, O. H. P.
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 72, No. 14, Ed. 1 Friday, February 7, 1997
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
February 7, 1997
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 6, No. 1653, Ed. 1 Wednesday, July 7, 1909
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
July 7, 1909
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 6, No. 1731, Ed. 1 Thursday, October 7, 1909
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 1909
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Schulenburg Sticker (Schulenburg, Tex.), Vol. 57, No. 31, Ed. 1 Friday, March 7, 1952
Weekly newspaper from Schulenburg, Texas that includes local, state and national news along with extensive advertising.
Date:
March 7, 1952
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Mt. Pleasant Times Review (Mount Pleasant, Tex.), Vol. 61, No. 17, Ed. 1 Friday, September 7, 1934
Weekly newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
September 7, 1934
Creator:
Cross, G. W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 5, No. 1422, Ed. 1 Wednesday, October 7, 1908
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 1908
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 22, No. 83, Ed. 1 Wednesday, April 7, 1897
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
April 7, 1897
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner-Press (Brenham, Tex.), Vol. 32, No. 264, Ed. 1 Monday, February 7, 1916
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
February 7, 1916
Creator:
Shannon, Emmet
Object Type:
Newspaper
System:
The Portal to Texas History
Radiochemical analysis using Empore{trademark} Rad Disks.
A solid-phase extraction technique that isolates specific radionuclides (i.e., {sup 89/90}Sr, {sup 226/228}Ra, {sup 99}Tc) from surface, ground, and drinking waters is described. The analyte is isolated by pulling a sample through an appropriate Empore{trademark} Rad Disk with a vacuum, and the disk is subsequently assayed by a suitable counting technique. The method has both laboratory and field applications. Interferences are discussed.
Date:
June 7, 1999
Creator:
Smith, L. L.
Object Type:
Article
System:
The UNT Digital Library
The Ranger (San Antonio, Tex.), Vol. 66, No. 12, Ed. 1 Friday, December 7, 1990
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
December 7, 1990
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Banner-Press (Brenham, Tex.), Vol. 85, No. 26, Ed. 1 Tuesday, February 7, 1950
Daily newspaper from Brenham, Texas that includes local, state, and national news along with advertising.
Date:
February 7, 1950
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Leader. (Lampasas, Tex.), Vol. [22], No. 8, Ed. 1 Friday, January 7, 1910
Weekly newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
January 7, 1910
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 27, No. 86, Ed. 1 Saturday, June 7, 1902
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
June 7, 1902
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
The Fayette County Record (La Grange, Tex.), Vol. 28, No. 29, Ed. 1 Tuesday, February 7, 1950
Semiweekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 7, 1950
Creator:
Sulak, L. J.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 13, No. 185, Ed. 1 Saturday, October 7, 1916
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 1916
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 4, No. 929, Ed. 1 Thursday, March 7, 1907
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
March 7, 1907
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 6, No. 1601, Ed. 1 Friday, May 7, 1909
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
May 7, 1909
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The La Grange Journal (La Grange, Tex.), Vol. 69, No. 41, Ed. 1 Thursday, October 7, 1948
Weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 7, 1948
Creator:
Priebe, Charles W.
Object Type:
Newspaper
System:
The Portal to Texas History