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Search Results: 1 - 10 of 496450 matches for " H. M. Staudenmaier "
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ParFORM: recent development
M. Tentyukov,J. A. M. Vermaseren,H. M. Staudenmaier
Computer Science , 2005, DOI: 10.1016/j.nima.2005.11.142
Abstract: We report on the status of our project of parallelization of the symbolic manipulation program FORM. We have now parallel versions of FORM running on Cluster- or SMP-architectures. These versions can be used to run arbitrary FORM programs in parallel.
Meson production on complex nuclei by pi^- with the Crystal Ball detector
A. Starostin,B. M. K. Nefkens,H. M. Staudenmaier,for the Crystal Ball Collaboration
Physics , 2002,
Abstract: We report on preliminary results for the production of neutral mesons by 750 MeV/$c$ $\pi^-$ on complex nuclear targets (C, Al, Cu) and hydrogen. Our simultaneous measurement of $\pi^0$, $2\pi^0$, and $\eta$ final states allows an investigation of the nuclear final-state-interaction effects. The data show that nuclear absorption is mainly responsible for an observed change in the shape of the $2\pi^0$ invariant mass spectra. Our preliminary result for the $\sigma \to \gamma \gamma$ branching ratio is BR$(\sigma \to \gamma \gamma) < 3.6\times 10^{-3} \times \phi$ at 90% C.L. on a carbon target, where $\phi$ is the fraction of $2\pi^0$ produced via the $\sigma$ intermediate state.
ParFORM: Parallel Version of the Symbolic Manipulation Program FORM
M. Tentyukov,D. Fliegner,M. Frank,A. Onischenko,A. Retey,H. M. Staudenmaier,J. A. M. Vermaseren
Computer Science , 2004,
Abstract: After an introduction to the sequential version of FORM and the mechanisms behind, we report on the status of our project of parallelization. We have now a parallel version of FORM running on Cluster- and SMP-architectures. This version can be used to run arbitrary FORM programs in parallel.
Precision Pion-Proton Elastic Differential Cross Sections at Energies Spanning the Delta Resonance
M. M. Pavan,J. T. Brack,F. Duncan,A. Feltham,G. Jones,J. Lange,K. J. Raywood,M. E. Sevior,R. Adams,D. F. Ottewell,G. R. Smith,B. Wells,R. L. Helmer,E. L. Mathie,R. Tacik,R. A. Ristinen,I. I. Strakovsky,H-M. Staudenmaier
Physics , 2001, DOI: 10.1103/PhysRevC.64.064611
Abstract: A precision measurement of absolute pi+p and pi-p elastic differential cross sections at incident pion laboratory kinetic energies from T_pi= 141.15 to 267.3 MeV is described. Data were obtained detecting the scattered pion and recoil proton in coincidence at 12 laboratory pion angles from 55 to 155 degrees for pi+p, and six angles from 60 to 155 degrees for pi-p. Single arm measurements were also obtained for pi+p energies up to 218.1 MeV, with the scattered pi+ detected at six angles from 20 to 70 degrees. A flat-walled, super-cooled liquid hydrogen target as well as solid CH2 targets were used. The data are characterized by small uncertainties, ~1-2% statistical and ~1-1.5% normalization. The reliability of the cross section results was ensured by carrying out the measurements under a variety of experimental conditions to identify and quantify the sources of instrumental uncertainty. Our lowest and highest energy data are consistent with overlapping results from TRIUMF and LAMPF. In general, the Virginia Polytechnic Institute SM95 partial wave analysis solution describes our data well, but the older Karlsruhe-Helsinki PWA solution KH80 does not.
Measurement of $K^- p$ radiative capture to $γΛ$ and $γ Σ^0$ for $p_{K^-}$ between 514 and 750 MeV/$c$
S. Prakhov,P. Vancraeyveld,N. Phaisangittisakul,B. M. K. Nefkens,V. Bekrenev,W. J. Briscoe,L. De Cruz,D. Isenhower,N. Knecht,A. Koulbardis,N. Kozlenko,S. Kruglov,G. Lolos,I. Lopatin,A. Maru?i?,S. McDonald,Z. Papandreou,D. Peaslee,J. W. Price,J. Ryckebusch,M. Sadler,A. Shafi,A. Starostin,H. M. Staudenmaier,I. I. Strakovsky,I. Supek,T. Van Cauteren
Physics , 2009, DOI: 10.1103/PhysRevC.82.015201
Abstract: Differential cross sections for $K^-$ radiative capture in flight on the proton, leading to the $\gamma\Lambda$ and $\gamma\Sigma^0$ final states, have been measured at eight $K^-$ momenta between 514 and 750 MeV/$c$. The data were obtained with the Crystal Ball multiphoton spectrometer installed at the separated $K/\pi$ beam line C6 of the BNL Alternating Gradient Synchrotron. The results substantially improve the existing experimental data available for studying radiative decays of excited hyperon states. An exploratory theoretical analysis is performed within the Regge-plus-resonance approach. According to this analysis, the $\gamma\Sigma^0$ final state is dominated by hyperonresonance exchange and hints at an important role for a resonance in the mass region of 1700 MeV. In the $\gamma\Lambda$ final state, on the other hand, the resonant contributions account for only half the strength, and the data suggest the importance of a resonance in the mass region of 1550 MeV.
Measurement of $π^0 Λ$, $\bar{K}^0 n$, and $π^0 Σ^0$ production in $K^- p$ interactions for $p_{K^-}$ between 514 and 750 MeV/$c$
S. Prakhov,B. M. K. Nefkens,V. Bekrenev,W. J. Briscoe,N. Knecht,A. Koulbardis,N. Kozlenko,S. Kruglov,G. Lolos,I. Lopatin,A. Maru?i?,S. McDonald,D. Peaslee,N. Phaisangittisakul,J. W. Price,A. Shafi,A. Starostin,H. M. Staudenmaier,I. I. Strakovsky,I. Supek
Physics , 2008, DOI: 10.1103/PhysRevC.80.025204
Abstract: Differential cross sections and hyperon polarizations have been measured for $\bar{K}^0 n$, $\pi^0 \Lambda$, and $\pi^0 \Sigma^0$ production in $K^- p$ interactions at eight $K^-$ momenta between 514 and 750 MeV/$c$. The experiment detected the multiphoton final states with the Crystal Ball spectrometer using a $K^-$ beam from the Alternating Gradient Synchrotron of BNL. The results provide significantly greater precision than the existing data, allowing a detailed reexamination of the excited hyperon states in our energy range.
Toxicological Assessment of Noxious Inhalants
Kleinsasser, N. H.,Sassen, A. W.,Wallner, B. W.,Staudenmaier, R.
GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery , 2004,
Abstract: In the past centuries mankind has been exposed to various forms of air pollution not only at his occupational but also in his social environment. He mainly gets exposed with these pollutants through the respiratory organs and partially absorbs them into the body. Many of these airborne substances can be harmful for humans and some of them may account for tumorigenic effects.The following essay describes the main features of toxicological assessment of inhalative environmental and workplace xenobiotics. The essay also explains relevant characteristics and limit values of noxious compounds and gases and depicts modern testing methods. To this end, emphasis is given on methods characterizing the different stages of tumorigenic processes. Various test systems have been developed which can be used in vivo, ex vivo or in vitro. They are to a great part based on the evidence of changes in DNA or particular genes of cells. Among others they have highlighted the impact of interindividual variability on enzymatic activation of xenobiotics and on susceptibility of the host to tumor diseases.Unfortunately, for many inhalative environmental noxious agents no sufficient risk profiles have been developed. The completion of these profiles should be the goal of toxicological assessment in order to allow reasonable socioeconomic or individual-based risk reduction.
Differential cross sections of the charge-exchange reaction pi- p --> pi0 n in the momentum range from 103 to 178 MeV/c
D. Mekterovi?,I. Supek,V. Abaev,V. Bekrenev,C. Bircher,W. J. Briscoe,R. V. Cadman,M. Clajus,J. R. Comfort,K. Craig,D. Grosnick,D. Isenhover,M. Jerkins,M. Joy,N. Knecht,D. D. Koetke,N. Kozlenko,A. Kulbardis,S. Kruglov,G. Lolos,I. Lopatin,D. M. Manley,R. Manweiler,A. Maru?i?,S. McDonald,B. M. K. Nefkens,J. Olmsted,Z. Papandreou,D. Peaslee,J. Peterson,N. Phaisangittisakul,S. N. Prakhov,J. W. Price,A. Ramirez,M. E. Sadler,A. Shafi,H. Spinka,S. Stanislaus,A. Starostin,H. M. Staudenmaier,I. Strakovsky,W. B. Tippens,S. Watson
Physics , 2009, DOI: 10.1103/PhysRevC.80.055207
Abstract: Measured values of the differential cross sections for pion-nucleon charge exchange, pi- p --> pi0 n, are presented for pi- momenta of 103, 112, 120, 130, 139, 152, and 178 MeV/c. Complete angular distributions were obtained by using the Crystal Ball detector at the Alternating Gradient Synchrotron at Brookhaven National Laboratory. Statistical uncertainties of the differential cross sections vary from 3% to 6% in the backward angle region, and from 6% to about 20% in the forward region with the exception of the two most forward angles. The systematic uncertainties are estimated to be about 3% for all momenta.
Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance
A. Shafi,S. Prakhov,I. I. Strakovsky,W. J. Briscoe,B. M. K. Nefkens,C. E. Allgower,R. A. Arndt,V. Bekrenev,C. Bennhold,M. Clajus,J. R. Comfort,K. Craig,D. Grosnick,D. Isenhower,N. Knecht,D. D. Koetke,A. Kulbardis,N. Kozlenko,S. Kruglov,G. Lolos,I. Lopatin,D. M. Manley,R. Manweiler,A. Marusic,S. McDonald,J. Olmsted,Z. Papandreou,D. Peaslee,N. Phaisangittisaku,J. W. Price,A. F. Ramirez,M. Sadler,H. Spinka,T. D. S. Stanislaus,A. Starostin,H. M. Staudenmaier,I. Supek,W. B. Tippens,R. L. Workman
Physics , 2004, DOI: 10.1103/PhysRevC.70.035204
Abstract: Differential cross sections for the process pi^- p -> gamma n have been measured at Brookhaven National Laboratory's Alternating Gradient Synchrotron with the Crystal Ball multiphoton spectrometer. Measurements were made at 18 pion momenta from 238 to 748 MeV/c, corresponding to E_gamma for the inverse reaction from 285 to 769 MeV. The data have been used to evaluate the gamma n multipoles in the vicinity of the N(1440) resonance. We compare our data and multipoles to previous determinations. A new three-parameter SAID fit yields 36 +/- 7 (GeV)^-1/2 X 10^-3 for the A^n_1/2 amplitude of the P_11.
Does the Sigma(1580)3/2- resonance exist?
Crystal Ball Collaboration,J. Olmsted,S. Prakhov,D. M. Manley,C. E. Allgower,V. S. Bekrenev,W. J. Briscoe,M. Clajus,J. R. Comfort,K. Craig,D. Grosnick,D. Isenhower,N. Knecht,D. D. Koetke,N. G. Kozlenko,S. Kruglov,A. A. Kulbardis,G. Lolos,I. V. Lopatin,R. Manweiler,A. Marusic,S. McDonald,B. M. K. Nefkens,Z. Papandreou,D. C. Peaslee,N. Phaisangittisakul,J. W. Price,A. F. Ramirez,M. Sadler,A. Shafi,H. Spinka,T. D. S. Stanislaus,A. Starostin,H. M. Staudenmaier,I. I. Strakovsky,I. Supek,W. B. Tippens
Physics , 2003, DOI: 10.1016/j.physletb.2004.02.070
Abstract: Precise new data for the reaction $K^- p \to \pi^0 \Lambda$ are presented in the c.m. energy range 1565 to 1600 MeV. Our analysis of these data sheds new light on claims for the $\Sigma(1580){3/2}^-$ resonance, which (if it exists with the specified quantum numbers) must be an exotic baryon because of its very low mass. Our results show no evidence for this state.
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