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in subjects: "Mass Spectra"

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Studies of the /sup 32/S + /sup 182/W reaction

Fission-like products from the reaction /sup 32/S + /sup 182/W were measured over the entire angular range from theta = 10-170/sup 0/ and for bombarding energies of E/sub lab/ = 166, 177, 222, and 260 MeV using an array of eight Si detectors. From the measured energy and flight time the product mass was determined event-by-event by performing the appropriate corrections for the plasma delay and pulse height defect associated with Si detectors. The mass, angular, and total kinetic energy distrib… more

Date: January 1, 1986

Creator: Back, B. B.; Keller, J. G.; Worsham, A.; Glagola, B. G.; Henderson, D.; Kaufman, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

An experimental high energy physics program: Task A

This report discusses elementary particle experiments with the CLEO detector, design of the gas microstrip detectors, and research in astrophysics. (LSP)

Date: April 1, 1992

Creator: Gaidos, J. A.; Loeffler, F. J.; McIlwain, R. L.; Miller, D. H.; Palfrey, T. R.; Shibata, E. I. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Recent results of the study of photon-photon collisions

Results are reported on the production of two- and four-hadron final states, and on the formation of the eta, eta' and f mesons in photon-photon collisions. 14 refs., 13 figs.

Date: August 1, 1985

Creator: Sens, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of heavy quark production with the Mark II at PEP

The methods adopted by the Mark II collaboration to study heavy quark production at PEP are described. Two complementary techniques are used: D* tagging using the decay chain D*/sup +/. D/sup 0/..pi../sup +/, D/sup 0/ ..-->.. K/sup -/..pi../sup +/, and inclusive lepton tagging using the characteristic p/sub T/ distributions to distinguish contributions from b and c quarks. These techniques are used to derive information about heavy quark fragmentation and about the weak coupling of heavy quarks. more

Date: October 1, 1983

Creator: Abrams, G.; Amidei, D.; Baden, A.; de la Vaissiere, C.; Gidal, G.; Gold, M. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Particle identification at an asymmetric B Factory

Particle identification systems are an important component of any detector at a high-luminosity, asymmetric B Factory. In particular, excellent hadron identification is required to probe CP violation in B{sup 0} decays to CP eigenstates. The particle identification systems discussed below also provide help in separating leptons from hadrons at low momenta. We begin this chapter with a discussion of the physics motivation for providing particle identification, the inherent limitations due to int… more

Date: September 1, 1991

Creator: Coyle, P.; Eigen, G.; Hitlin, D.; Oddone, P.; Ratcliff, B.; Roe, N. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Discovery of /sup 260/Md and the decay properties of /sup 258/Fm, /sup 258m,g/Md, and /sup 259/Md

We have discovered a new neutron-rich isotope, /sup 260/Md, from /sup 18/O and /sup 22/Ne bombardments of /sup 254/Es. We observed a spontaneous-fission (SF) activity with a 32-day half-life in electromagnetically separated mass-260 fractions from these bombardments and we have measured the mass and kinetic energy distributions of this SF activity. The mass distribution was symmetric with the principal energy peak at 234-MeV total kinetic energy (TKE), similar to previous observations for heavy… more

Date: August 1, 1985

Creator: Lougheed, R. W.; Hulet, E. K.; Dougan, R. J.; Wild, J. F.; Dupzyk, R. J.; Henderson, C. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Review of CERN heavy-ion physics

Results from the heavy-ion experiments at the CERN SPS are reviewed in the context of possible formation and identification of a quark-gluon plasma (QGP).

Date: November 1, 1991

Creator: Odyniec, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of S = 0 dibaryon resonances and candidates

Experimental data concerning S = O dibaryon resonances are reviewed, with an emphasis on the nucleon-nucelon system. Structures observed in the ..gamma..d channel, the ..pi..d elastic scattering, pp ..-->.. ..pi..d channel, and other channels are discussed. Experimental data are compared with various theories. The short-range forces can be represented by dibaryon resonances. Further measurements to clarify the understanding of dibaryons are also discussed. 53 refs., 24 figs.

Date: April 18, 1985

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

New particle searches at CDF

We present results from searches for the top quark, supersymmetric particles, and new gauge bosons at the Collider Detector at Fermilab (CDF). 8 refs., 6 figs.

Date: January 1, 1991

Creator: Kuhlmann, S.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A measurement of the Z boson resonance parameters at the SLC (Stanford Linear Center)

We have measured the resonance parameters of the Z boson using 480 hadronic and Leptonic Z decays collected by the Mark II Detector at the Stanford Linear Collider. We find the Mass to be 91.14 {+-} 0.12 GeV/c{sup 2}, and the width to be 2.42{sup +0.45}{sub {minus}0.35} GeV. If we constrain the visible width to its Standard Model value, we find a partial width to invisible decay modes corresponding to 2.8 {+-} 0.6 neutrino species with a 95% confidence level limit of 3.9. 9 refs., 1 fig., 4 tab… more

Date: November 1, 1989

Creator: Nash, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hybrid Simulations With Dynamical Quarks: Spectra, Screening and Thermodynamics

We summarize simulations made by the Argonne/University of Illinois group using the Hybrid algorithm to include dynamical staggered fermions. Recent work on the mass spectrum and screening effects due to the inclusion of four light flavors of dynamical quarks is presented. We also present a brief overview of what we have learned about the finite temperature chiral phase transition. 5 refs., 4 figs., 1 tab.

Date: November 18, 1987

Creator: Sinclair, D. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Pyrolysis mechanisms. Quarterly report, April-June 1981

The data acquisition system for fast pyrolysis studies is summarized and discussed, based on preliminary applications to fast scans and peak switching of the quadrupole mass spectrometer. The free-jet expansion phenomena of internal-state cooling and clustering are discussed in terms of their relevance to pyrolysis product sampling interpretation. Primary pyrolysis spectra are shown for cotton, wood, and steam-exploded extracted lignin. Both pulsed and steady-state pyrolysis were used to observ… more

Date: December 1, 1981

Creator: Milne, T.A. & Soltys, M.N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Influence of quasi-elastic channels on fusion

Experiments that measure the strength of different transfer reactions in heavy reaction systems at energies in the vicinity of the Coulomb barrier are discussed. A short discussion is given of experimental techniques that are available in this field and their advantages and shortfalls. The main features of the transfer reactions are summarized. Questions concerning the system dependence and energy dependence of the strongest reaction channels are addressed. A systematic picture of the strength … more

Date: March 1, 1986

Creator: Rehm, K.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Supercollider physics

The physics that can be explored with multi-TeV supercolliders is reviewed, including parton distributions, hadron jet production, the standard electroweak theory and minimal extensions to it, technicolor, supersymmetry, and compositeness. 19 refs., 11 figs. (LEW)

Date: March 1, 1985

Creator: Quigg, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of incomplete fusion for light heavy-ion systems using velocity distributions

Experimental results on incomplete fusion for light systems are discussed by studying the velocity distribution of fusion-like residues in the energy range of 6 to 20 MeV/nucleon. Original experimental work and results from other groups including the Hahn-Meitner Institute and the Argonne National Laboratory are also cited. Reactions between /sup 14/N, /sup 16/O, /sup 19/F, and /sup 20,22/Ne projectiles and /sup 24,26/Mg, /sup 27/Al, /sup 28/Si, /sup 40/Ca and /sup 58,60/Ni targets have been st… more

Date: March 1, 1986

Creator: Chan, Y.; Albiston, C.; Bantel, M.; Budzanowski, A.; DiGregorio, D.; Stokstad, R.G. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Identifying heavy Higgs bosons

Two techniques for identifying heavy Higgs bosons produced at SSC energies are discussed. In the first, the Higgs boson decays into ZZ, with one Z decaying into an e-pair or ..mu..-pair and the other into a neutrino pair. In the second, the production of the Higgs boson by WW fusion is tagged by detecting the quarks that produced the bremsstrahlung virtual W's. The associated Higgs decay is identified by one leptonic and one hadronic decay. Both methods appear capable of finding a heavy Higgs b… more

Date: June 1, 1986

Creator: Cahn, R.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Intermediate Vector Bosons in the Muon Channel

Description of the W{sup {plus minus}} and Z{sup 0} mass measurement in the muon decay channel, using 4.4 pb{sup {minus}1} of proton-antiproton collision data from the Fermilab Tevatron and CDF. A preliminary result of M{sub w} = 79.9 {plus minus} 0.4 {plus minus} 0.6 GeV/c{sup 2} is presented, and the published values of M{sub z} = 90.9 {plus minus} 0.3 {plus minus} 0.2 GeV/c{sup 2} and {Gamma}{sub z} = 3.8 {plus minus} 1.1 {plus minus} 1.0 GeV/c{sup 2} are described. 8 refs., 5 figs., 6 tabs.

Date: December 1, 1989

Creator: Smith, David A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Meson and baryon correlation studies using the PEP-TPC/2. gamma. Facility

Results on vector meson, and strange and charmed-baryon production are presented for data taken during the period 1982--1986 using the TPC/2{gamma} detector at PEP. Vector mesons ({rho}{sup 0}, K{sup *} and {phi}) with 0, 1 and 2 strange quarks are used to obtain redundant measures of strange-quark suppression and of the vector to pseudoscalar ratio in hadronization. Measurements of the production rates of {Lambda}, {Xi}{sup {minus}}, {Omega} and {Xi}{sup *0} hyperons and for the {Lambda}{sub c… more

Date: March 1, 1991

Creator: Ronan, M.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Glueballs in the reaction. pi. /sup -/p. -->. phi phi n at 22 GeV/c

The current favorite candidate theory of strong interactions is Quantum Chromodynamics. In this theory, bound states of two or more gluons, called glueballs, must exist. Experimentally, the detection of glueballs (all of which are massive enough to decay quickly to ordinary q anti q hadrons) is complicated by the lack of any explicit signature. The calculation of the mass of the low-lying glueballs by lattice gauge methods and the MIT bag model at present give only a rough guide to experimental… more

Date: January 1, 1983

Creator: Love, W.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Jets in e/sup +/e/sup -/ annihilation

The properties of jets produced in e/sup +/e/sup -/ annihilation have been investigated using data taken with the Mark 1 detector at SPEAR. The momentum distributions parallel and perpendicular to the jet axis were measured for all charged tracks, for K/sup 0/'s, and for rho/sup 0/'s. The K/sup 0/ and rho/sup 0/ Pt/sup 2/ distributions are well fit by the form dn/dPt/sup 2/ = A exp(-B/sup +/ Pt/sup 2/) with B = 4.6 +/- 0.2 for K/sup 0/'s and 5 +/- 1 for rho/sup 0/'s. The charged particle Pt/sup… more

Date: August 1, 1980

Creator: Cooper, S.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Measurement of the decay UPSILON(2S). -->. pi. /sup 0/. pi. /sup 0/UPSILON(1S)

The hadronic transitions UPSILON(2S) ..-->.. ..pi../sup 0/..pi..UPSILON(1S) ..-->.. ..gamma gamma gamma gamma..l/sup +/l/sup -/ (l = ..mu.. or e) are investigated using the Crystal Ball detector. The analysis is based on 193,000 UPSILON(2S) events produced at the DORIS II e/sup +/e/sup -/ storage ring from November 1982 to February 1984. We observe 44 events with a muon pair and 46 events with an electron pair in the final state. The signals in both channels are relatively background free. Assu… more

Date: September 1, 1985

Creator: Gelphman, D.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Resonance ionization mass spectrometry of lead and bismuth mixtures

Resonance ionization of lead and bismuth has been demonstrated using an excimer laser pumped dye laser in three-photon, one-color ionization schemes, using a quadrupole mass spectrometer for detection.

Date: January 1, 1988

Creator: Fearey, B. L.; Miller, C. M.; Anderson, J. E.; Nogar, N. S. & Rowe, M. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Rare K sup + decays in flight: Latest results and future plans

E777 at the Brookhaven AGS has published a final branching ratio limit for the lepton family violating decay K{sup +} {yields} {pi}{sup +}{mu}{sup +}e{sup {minus}} of 2.1 {times} 10{sup {minus}10} (90% C.L.). New results based on approximately 500 events of the G.I. M. suppressed decay K{sup +} {yields} {pi}{sup +}e{sup +}e{sup {minus}} have yielded a branching ratio of (2.75 {plus minus} 0.23 {plus minus} 0.13) {times} 10{sup {minus}7} assuming a vector interaction with, a form factor = 0.105 … more

Date: January 1, 1991

Creator: Alliegro, C.; Zeller, M. E. (Yale Univ., New Haven, CT (United States)); Campagnari, C. (Chicago Univ., IL (United States)); Chaloupka, V.; Lubatti, H. J.; Zhao, T. (Washington Univ., Seattle, WA (United States)) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The dijet mass and angular distributions at CDF

The dijet mass and the jijet angular distribution, as measured in the CDF detector at the Fermilab Tevatron Collider, are compared to leading order (LO) and next-to-leading (NLO) order QCD calculations. 5 refs., 1 fig., 1 tab.

Date: September 1, 1991

Creator: Flaugher, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department