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Electromagnetic and Hadron Calorimeters in the MIPP Experiment

Description: The purpose of the MIPP experiment is to study the inclusive production of photons, pions, kaons, and nucleons produced in π, K, and p interactions on various targets using beams from the Main Injector at Fermilab. The purpose of the calorimeters is to measure the production of forward-going photons and neutrons. The electromagnetic calorimeter consists of 10 lead plates interspersed with proportional chambers followed by the hadron calorimeter with 64 steel plates interspersed with scintillator. We collected data with a variety of targets with beam energies from 5 GeV/c up to 120 GeV/c. The energy calibration of both calorimeters with electrons, pions, kaons and protons is discussed. The performance of the calorimeters was tested on a neutron sample.
Date: October 1, 2006
Creator: Nigmanov, T. S.; Gustafson, H. R.; Longo, M. J. & Collaboration), D. Rajaram (MIPP
Partner: UNT Libraries Government Documents Department

Characteristics of the M-3 Neutral Beam at NAL

Description: We present here a summary of the properties of the M-3 neutral beam that might be of interest to other experimenters. We have determined the spectra and yields of neutrons, photons, and kaons. These data were taken in conjunction with experiments E-4 and E-230.
Date: January 1, 1974
Creator: Longo, M.J.; Ayre, C.A.; Burke, D.L.; Gustafson, H.R.; Jones, L.W.; Ramana Murthy, P.V. et al.
Partner: UNT Libraries Government Documents Department

Inelastic Neutron Cross Sections on Nuclei at FNAL

Description: Direct experimental measurements of the inelastic cross sections of neutrons on a variety of nuclei have been made at Fermi lab over the energy range from 50 to 350 GeV. These data may be used, together with nucleon-nucleon total cross sections measured through the same energy range, to justify and verify the interpretation of cosmic ray data on interaction mean free paths in air or iron in terms of nucleon-nucleon total cross sections at much higher energies.
Date: May 1, 1977
Creator: Jones, L.W.; /Michigan U. /Queen Mary, U. of London; Gustafson, H.R.; Longo, M.J.; Roberts, T.; Whalley, M. et al.
Partner: UNT Libraries Government Documents Department

Neutron - Proton Elastic Scattering from 70-GeV/c to 400-GeV/c

Description: The authors have measured neutron-proton elastic scattering cross sections for four-momentum transfers .17 {le} -t {le} 3.5(GeV/c){sup 2}. The logarithmic slope parameter is found to be consistent with existing proton-proton parameterizations. The data also exhibit a dip in the cross section near -t {approx} 1.4(geV/c){sup 2} for incident neutron momenta above 200 GeV/c. Differences between n-p and p-p cross sections are noted in the region .7 {le} -t {le} 1.4(GeV/c){sup 2}.
Date: March 1, 1978
Creator: DeHaven, C.E., Jr.; Ayre, C.A.; Gustafson, H.R.; Jones, L.W.; Longo, M.J.; Ramana Murthy, P.V. et al.
Partner: UNT Libraries Government Documents Department

An Experimental Test of Time-Reversal Invariance inthePhotodisintegration of the Deuteron

Description: We present data from a measurement of angular distributions of the reaction n + p {yields} {gamma} + d (1a) for neutrons with energies between 300 and 700 MeV. These data are compared with recent data for the inverse reaction {gamma} + d {yields} n + p (1b). Time-reversal invariance implies that apart from a normalization factor the angular distributions should be the same. We find an intriguing discrepancy in the vicinity of the well-known peak in the total cross section of reaction (1b) and apparent agreement elsewhere. The discrepancy occurs in the shape of the angular distributions and does not depend on the normalization of our data or those of the inverse reaction experiments.
Date: September 1, 1969
Creator: Schrock, B.L.; Detoeuf, J.-F.; Haddock, R.P.; Helland, J.A.; Longo, M.J.; Young, K.K. et al.
Partner: UNT Libraries Government Documents Department

Electromagnetic and hadron calorimeters in the MIPP experiment

Description: The purpose of the MIPP experiment is to study the inclusive production of photons, pions, kaons, and nucleons in {pi}, K, and p interactions on various targets using beams from the Main Injector at Fermilab. The function of the calorimeters is to measure the production of forward-going neutrons and photons. The electromagnetic calorimeter consists of 10 lead plates interspersed with proportional chambers. It was followed by the hadron calorimeter with 64 steel plates interspersed with scintillator. The data presented were collected with a variety of targets and beam momenta from 5 to 120 GeV/c. The energy calibration of both calorimeters with electrons, pions, kaons, and protons is discussed. The resolution for electrons was found to be 0.27/{radical}E, and for hadrons the resolution was 0.554/{radical}E with a constant term of 2.6%. The performance of the calorimeters was tested on a neutron sample.
Date: October 1, 2008
Creator: Nigmanov, T.S.; Gustafson, H.R.; Longo, M.J.; Park, H.K.; Rajaram, D.; U., /Michigan et al.
Partner: UNT Libraries Government Documents Department

Forward Neutron Production at the Fermilab Main Injector

Description: We have measured cross sections for forward neutron production from a variety of targets using proton beams from the Fermilab Main Injector. Measurements were performed for proton beam momenta of 58 GeV/c, 84 GeV/c, and 120 GeV/c. The cross section dependence on the atomic weight (A) of the targets was found to vary as A{sup a} where a is 0.46 {+-} 0.06 for a beam momentum of 58 GeV/c and 0.54 {+-} 0.05 for 120 GeV/c. The cross sections show reasonable agreement with FLUKA and DPMJET Monte Carlos. Comparisons have also been made with the LAQGSM Monte Carlo. The MIPP (Main Injector Particle Production) experiment (FNAL E907) [1] acquired data in the Meson Center beam line at Fermilab. The primary purposes of the experiment were to investigate scaling laws in hadron fragmentation [2], to obtain hadron production data for the NuMI (Neutrinos at the Main Injector [3]) target to be used for calculating neutrino fluxes, and to obtain inclusive pion, neutron, and photon production data to facilitate proton radiography [4]. While there is considerable data available on inclusive charged particle production [5], there is little data on neutron production. In this article we present results for forward neutron production using proton beams of 58 GeV/c, 84 GeV/c, and 120 GeV/c on hydrogen, beryllium, carbon, bismuth, and uranium targets, and compare these data with predictions from Monte Carlo simulations.
Date: October 1, 2010
Creator: Nigmanov, T.S.; U., /Michigan; Rajaram, D.; U., /Michigan; Longo, M.J.; U., /Michigan et al.
Partner: UNT Libraries Government Documents Department

Measurement of the asymmetry in the decay Antiomega+ ---> Antilambda K+ ---> anti-p pi+ K+

Description: The asymmetry in the {bar p} angular distribution in the sequential decay {bar {Omega}}{sup +} {yields} {bar {Lambda}}K{sup +} {yields} {bar p}{pi}{sup +}K{sup +} has been measured to be {bar {alpha}}{sub {Omega}}{bar {alpha}}{sub {Lambda}} = [+1.16{+-}0.18(stat){+-}0.17(syst)]x10{sup -2} using 1.89x10{sup 6} unpolarized {bar {Omega}}{sup +} decays recorded by the Hyper CP (E871) experiment at Fermilab. Using the known value of {alpha}{sub {Lambda}}, and assuming that {bar {alpha}}{sub {Lambda}} = -{alpha}{sub {Lambda}}, {bar {alpha}}{sub {Omega}} = [-1.81{+-}0.28(stat){+-}0.26(syst)]x10{sup -2}. A comparison between this measurement of {bar {alpha}}{sub {Omega}}{bar {alpha}}{sub {Lambda}} and recent measurements of {alpha}{sub {Omega}}{alpha}{sub {Lambda}} made by HyperCP shows no evidence of a violation of CP symmetry.
Date: January 1, 2006
Creator: Lu, L.C.; Burnstein, R.A.; Chakravorty, A.; Chen, Y.C.; Choong, W.S.; Clark, K. et al.
Partner: UNT Libraries Government Documents Department

Search for CP violation in hyperon decays.

Description: Direct CP violation in nonleptonic hyperon decays can be established by comparing the decays of hyperons and anti-hyperons. For {Xi} decay to {Lambda} {pi} followed by {Lambda} to p{pi}, the proton distribution in the rest frame of Lambda is governed by the product of the decay parameters {alpha}{sub {Xi}} {alpha}{sub {Lambda}}. The asymmetry A{sub {Xi}{Lambda}}, proportional to the difference of {alpha}{sub {Xi}}{alpha}{sub {Lambda}} of the hyperon and anti-hyperon decays, vanishes if CP is conserved. We report on an analysis of a fraction of 1997 and 1999 data collected by the Hyper CP (E871) collaboration during the fixed-target runs at Fermilab. The preliminary measurement of the asymmetry is {Alpha}{sub {Xi}{Lambda}} = [-7 {+-} 12(stat) {+-} 6.2(sys)] x 10{sup -4}, an order of magnitude better than the present limit.
Date: October 25, 2002
Creator: Zyla, Piotr; Chan, A.; Chen, Y.C.; Ho, C.; Teng, P.K.; Choong, W.S. et al.
Partner: UNT Libraries Government Documents Department

Examining CP symmetry in strange baryon decay

Description: Non-conservation of CP symmetry can manifest itself in non-lepton ichyperon decays as a difference in the decay parameter between the strange-baryon decay and its charge conjugate. By comparing the decay distribution in the {Lambda} helicity frame for the decay sequence {Xi}{sup -} {yields} {Lambda}{pi}{sup -}, {Lambda} {yields} p{pi}{sup -} with that of {bar {Xi}}{sup +} decay, E756 at Fermilab did not observe any CP-odd effect at the 10{sup -2} level. The status of a follow-up experiment, HyperCP (FNAL E871), to search for CP violation in charged {Xi}-{Lambda} decay with a sensitivity of 10{sup -4} is also presented.
Date: April 5, 2000
Creator: Luk, Kam-Biu; Collaboration, Fermilab E756; Collaboration, HyperCP; Burnstein, R.A.; Chakravorty, A.; Chan, A. et al.
Partner: UNT Libraries Government Documents Department