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Schmidt, D.

California Univ., Livermore (USA). Lawrence Radiation Lab

California Univ., Livermore (USA). Lawrence Radiation Lab

AbstractAbstract

No abstract available

Primary Subject

Source

Feb 1971; 93 p; Thesis.

Record Type

Report

Report Number

Country of publication

Publication YearPublication Year

Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Schmidt, D.

Heidelberg Univ. (Germany, F.R.). Naturwissenschaftliche Gesamtfakultaet

Heidelberg Univ. (Germany, F.R.). Naturwissenschaftliche Gesamtfakultaet

AbstractAbstract

[en] The reactions studied at the Heidelberg MP-Emperor-tandem were the (HI,xn)-reactions

^{118}Sn(^{16}0,xnγ)sup(134-x)Ce and^{115}In(^{19}F,xnγ)sup(134-x)Ce as well as the elastic scattering of these projectiles. Measured were the reaction cross section over the angular distribution of the elastic scattering, the fusion cross sections, and the γ-multiplicities over the characteristic γ-lines of the evaporation residue nuclei. With that the distribution of the incident angular momenta which lead to the fusion should be discussed in comparison to the Sharp cutoff model. The results show at the smallest projectile energies a remarkably small contribution of the fusion to the total reaction cross section, which leads to a very flat angular momentum distribution. With increasing energy the fusion cross section grows faster than the reaction cross section so that the form of the distribution more and more approaches to a SCO-distribution which is finally at the highest energy practically reached. Furthermore it is to be mentioned the two reactions described above as well a reaction with a^{24}Mg beam earlier studied yield as independent measurements consistent results. (orig.)[de]

Die am Heidelberger MP-Emperor-Tandem untersuchten Reaktionen waren die (HI,xn)-Reaktionen ^{118}Sn(

^{16}0,xnγ)sup(134-x)Ce und

^{115}In(

^{19}F,xnγ)sup(134-x)Ce sowie die elastische Streuung dieser Projektile. Gemessen wurden der Reaktions-WQ ueber die Winkelverteilung der elastischen Streuung, der Fusions-WQ und die γ-Multiplizitaeten ueber die charakteristischen γ-Linien der Verdampfungsrestkerne. Damit sollte die Verteilung der Eingangs-Drehimpulse, die zur Fusion fuehren, im Vergleich zum Sharp-Cutoff-Modell diskutiert werden. Die Ergebnisse zeigen bei den kleinsten Projektil-Energien einen erstaunlich kleinen Anteil der Fusion am Gesamt-Reaktions-WQ, was zu einer sehr flachen Drehimpulsverteilung fuehrt. Mit zunehmender Energie waechst der Fusions-WQ schneller als der Reaktions-WQ, so dass sich die Form der Verteilung mehr und mehr einer SCO-Verteilung annaehert, die schliesslich bei der hoechsten Energie praktisch erreicht wird. Erwaehnen muss man noch, dass die beiden oben genannten Reaktionen sowie eine frueher untersuchte Reaktion mit

^{24}Mg-Strahl als voneinander unabhaengige Messungen konsistente Ergebnisse liefern. (orig.)

Original Title

Drehimpulsverteilungen in (HI,xn)-Reaktionen

Primary Subject

Source

1980; 81 p; Diss. (D.Sc.).

Record Type

Miscellaneous

Literature Type

Thesis/Dissertation; Numerical Data

Report Number

Country of publication

ANGULAR DISTRIBUTION, ANGULAR MOMENTUM, CERIUM ISOTOPES, DIFFERENTIAL CROSS SECTIONS, ELASTIC SCATTERING, ENERGY DEPENDENCE, EXCITATION FUNCTIONS, EXPERIMENTAL DATA, FLUORINE 19, FLUORINE 19 REACTIONS, FORM FACTORS, HEAVY ION FUSION REACTIONS, INDIUM 115, INDIUM 115 TARGET, INTEGRAL CROSS SECTIONS, INTERNAL CONVERSION RADIOISOTO, MEV RANGE 100-1000, MEV RANGE 10-100, MULTIPLICITY, NEUTRONS, PHOTONS

BARYONS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CROSS SECTIONS, DATA, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FLUORINE ISOTOPES, HADRONS, HEAVY ION REACTIONS, HOURS LIVING RADIOISOTOPES, INDIUM ISOTOPES, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, MASSLESS PARTICLES, MEV RANGE, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, NUCLEOSYNTHESIS, NUMERICAL DATA, ODD-EVEN NUCLEI, PARTICLE PROPERTIES, RADIOISOTOPES, SCATTERING, STABLE ISOTOPES, TARGETS, YEARS LIVING RADIOISOTOPES

Publication YearPublication Year

Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Schmidt, D.

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Hamburg Univ. (Germany). Fachbereich 12 - Physik

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Hamburg Univ. (Germany). Fachbereich 12 - Physik

AbstractAbstract

[en] An analysis of the diffractive photoproduction of J/ψ and ψ' mesons is presented in this thesis which uses data collected by the H1 detector at the HERA collider. The data sample corresponds to an integrated luminosity of 36.6 pb

^{-1}. The analysis covers a kinematic range 40 GeV < W_{γp}< 150 GeV and Q^{2}< 1 GeV^{2}. Elastic meson production is measured up to vertical stroke t vertical stroke < 1.2 GeV^{2}. For proton dissociative events the analysis is restricted to vertical stroke t vertical stroke < 5 GeV^{2}. The statistics are increased with respect to the previously published measurement by not only detecting the J/ψ mesons via their decays into two muons, but also via their decays into two electrons. Measurements of the γp cross sections as function of W_{γp}for elastic and proton dissociative J/ψ production are presented. Both cross sections show a strong rise with increasing energy which is comparable within the errors. In addition, differential cross sections dσ / dt ∝ exp(-b vertical stroke t vertical stroke) as a function of vertical stroke t vertical stroke are measured. The extracted slopes b for elastic and proton dissociative J/ψ production are in agreement with older measurements. The statistical error is, however, reduced. The ψ' mesons are detected via the decay ψ'→ J/ψ π^{+}π^{-}and the direct leptonic decays. A measurement of the total quasi-elastic ψ' to J/ψ production ratio is presented. The quasi-elastic γp cross section is also determined. A parameterisation σ_{γp}∝ W_{γp}^{δ}of the energy dependence results in a value of δ = 1.12±0.27. In addition the t-dependences of the differential cross sections of elastic and proton dissociative ψ' production are compared to those of J/ψ production. The measured slopes are b_{el}= (4.71±0.93_{-0.69}^{+0.73}) GeV^{-2}for elastic and b_{pd}= (1.10±0.24_{-0.59}^{+0.55}) GeV^{-2}for proton dissociative production. The energy dependence and the t-dependence of the ψ' and J/ψ cross sections are comparable within the (big) statistical and systematical errors. (orig.)Original Title

Diffraktive Photoproduktion von Charmonium im H1-Detektor bei HERA

Primary Subject

Source

Jun 2001; 156 p; ISSN 1435-8085; ; Available from TIB Hannover: RR 8919(2001-029); Diss.

Record Type

Report

Literature Type

Thesis/Dissertation; Numerical Data

Report Number

Country of publication

BARYONS, BASIC INTERACTIONS, BOSONS, CATIONS, CHARGED PARTICLES, CHARMONIUM, CROSS SECTIONS, DATA, ELECTROMAGNETIC INTERACTIONS, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FUNCTIONS, GEV RANGE, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, INTERACTIONS, IONS, MATHEMATICAL MODELS, MESONS, NUCLEONS, NUMERICAL DATA, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PRODUCTION, PHOTON-BARYON INTERACTIONS, PHOTON-HADRON INTERACTIONS, PHOTON-NUCLEON INTERACTIONS, QUARKONIUM, VECTOR MESONS

Publication YearPublication Year

Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Schmidt, D.; Mannhart, W.

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] Differential cross sections of elastic and inelastic neutron scattering on

^{93}Nb were determined in the energy range from 7.10 MeV to 14.10 MeV at eight incident energies. The data were derived by comparing the net time-of-flight spectra with calculated spectra using a realistic Monte Carlo simulation. The time-of-flight measurement was accompanied by extensive and careful calibrations. The niobium cross sections have been normalized to hydrogen scattering. The disturbing breakup scattering fraction of the non-monoenergetic DD neutron source can be subtracted after having been calculated by a Monte Carlo simulation. The data for such a calculation are checked and adjusted using an additional pure breakup neutron source based on the^{4}He(d,np)^{4}He reaction. By proper subtraction of the breakup fractions, double-differential cross sections can be obtained for neutron emission energies down to 1.5 MeV. Partial inelastic cross sections could be determined for a number of low-lying levels or level groups of^{93}Nb. Angle-integrated cross sections were derived by fitting Legendre polynomial expansions to the measured angular distributions using least-squares methods. The results of this work have been compared with those of other authors and with the ENDF/B-VI evaluation. (orig.)Primary Subject

Source

Mar 2007; 62 p; ISSN 0936-0492; ; Available from TIB Hannover: RO 8345(56); Also available from: Wirtschaftsverlag NW, Verlag fuer neue Wissenschaft GmbH, Buergermeister-Smidt-Str. 74-76, 27568 Bremerhaven

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

BARYON REACTIONS, BARYONS, CROSS SECTIONS, DATA, DIFFERENTIAL CROSS SECTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FUNCTIONS, HADRON REACTIONS, HADRONS, INFORMATION, INTERMEDIATE MASS NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MEV RANGE, NEUTRONS, NIOBIUM ISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, ODD-EVEN NUCLEI, RADIOISOTOPES, SCATTERING, SPECTRA, STABLE ISOTOPES, TARGETS, YEARS LIVING RADIOISOTOPES

Publication YearPublication Year

Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Schmidt, D.; Boettger, R.

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] Neutron detection efficiencies of NE213 scintillation detectors were determined by comparison of the measured neutron time-of-flight spectrum of a

^{252}Cf source deposited in a parallel-plate, low-mass ionization chamber with its reference neutron energy distribution. Measurement conditions and parameters were systematically varied to study their influence on the efficiencies obtained. The efficiencies derived from the measurement were compared with well-established efficiencies of the detectors used. These efficiencies were calculated with a Monte Carlo code and corrected after comparison with a proton recoil telescope in neutron fluence measurements. Details of the measurement and the data analysis including the corrections needed are discussed. (orig.)Primary Subject

Source

Record Type

Report

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Country of publication

ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYONS, CALIFORNIUM ISOTOPES, DECAY, DETECTION, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-EVEN NUCLEI, FERMIONS, FISSION, HADRONS, HEAVY NUCLEI, ISOTOPES, MEASURING INSTRUMENTS, MEV RANGE, NEUTRONS, NUCLEAR DECAY, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, RADIATION DETECTION, RADIATION DETECTORS, RADIOISOTOPES, SCINTILLATION COUNTERS, SOLID SCINTILLATION DETECTORS, SPONTANEOUS FISSION RADIOISOTOPES, YEARS LIVING RADIOISOTOPES

Publication YearPublication Year

Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Schmidt, D.; Siebert, B.R.L.

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] The computational simulation of the deuteron breakup in a scattering experiment has been investigated. Experimental breakup spectra measured at 16 deuteron energies and at 7 angles for each energy served as the data base. Analysis of these input data and of the conditions of the scattering experiment made it possible to reduce the input data. The use of one weighted breakup spectrum is sufficient to simulate the scattering spectra at one incident neutron energy. A number of tests were carried out to prove the validity of this result. The simulation of neutron scattering on carbon, including the breakup, was compared with measured spectra. Differences between calculated and measured spectra were for the most part within the experimental uncertainties. Certain significant deviations can be attributed to erroneous scattering cross sections taken from an evaluation and used in the simulation. Scattering on higher-lying states in

^{12}C can be analyzed by subtracting the simulated breakup-scattering from the experimental spectra. (orig.)Primary Subject

Secondary Subject

Source

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

ANGULAR DISTRIBUTION, BREAKUP REACTIONS, CARBON 12, CARBON 12 TARGET, COMPUTERIZED SIMULATION, CROSS SECTIONS, DEUTERIUM, DEUTERIUM TARGET, DEUTERON REACTIONS, DEUTERONS, DIFFERENTIAL CROSS SECTIONS, ENERGY SPECTRA, FAST NEUTRONS, HELIUM 3, INELASTIC SCATTERING, MEV RANGE 01-10, MEV RANGE 10-100, MONTE CARLO METHOD, NEUTRON REACTIONS, NEUTRON SPECTRA, ONE-NUCLEON TRANSFER REACTIONS, PROTONS, QUASI-ELASTIC SCATTERING, THEORETICAL DATA

BARYON REACTIONS, BARYONS, CALCULATION METHODS, CARBON ISOTOPES, CATIONS, CHARGED PARTICLES, DATA, DIRECT REACTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, FERMIONS, HADRON REACTIONS, HADRONS, HELIUM ISOTOPES, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, HYDROGEN ISOTOPES, INFORMATION, IONS, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NEUTRONS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, ODD-ODD NUCLEI, SCATTERING, SIMULATION, SPECTRA, STABLE ISOTOPES, TARGETS, TRANSFER REACTIONS

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Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] At PTB, extensive Monte Carlo codes have been successfully used for realistic simulating fluence and scattering cross section measurements with fast neutrons. The SINENA code describes neutron production using a gas target as well as neutron detection with scintillation detectors. In addition, the detection processes in a proton recoil telescope can be simulated to determine neutron fluences. Besides neutron production and detection, the STREUER code simulates the neutron interaction processes within a scattering sample. In recent years, both codes have been extended and applied in numerous experiments. The reliability of the codes could be substantially improved by comparison with measurements under widely varying experimental conditions. The usage of the codes is described in a summarizing manner. The algorithm of the simulation, all input data needed and exemplary results of the simulation are described and presented in detail. (orig.)

Primary Subject

Source

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Report

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Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] Differential cross sections of elastic and inelastic neutron scattering on

^{14}N were determined in the energy range from 7.89 MeV to 13.85 MeV at 7 incident energies. The data were derived by comparing the net TOF spectra with calculated spectra using a realistic Monte Carlo simulation. The TOF measurement was accompanied by extensive and careful calibrations. The nitrogen cross sections have been normalized to hydrogen scattering. In addition to the elastic cross sections, 8 partial inelastic cross sections were measured at each energy attributed to excited levels or a level doublet of^{14}N. Angle-integrated cross sections were derived by fitting Legendre polynomial expansions to the measured angular distributions using least-squares methods. The results of this work have been compared with those of other authors and with the ENDF/B-VI evaluation. (orig.)Primary Subject

Source

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

BARYON REACTIONS, BARYONS, CROSS SECTIONS, DATA, DIFFERENTIAL CROSS SECTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY LEVELS, ENERGY RANGE, ENERGY-LEVEL TRANSITIONS, FERMIONS, FUNCTIONS, HADRON REACTIONS, HADRONS, INFORMATION, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NEUTRONS, NITROGEN ISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, ODD-ODD NUCLEI, SCATTERING, STABLE ISOTOPES, TARGETS

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Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] Differential cross sections of elastic and inelastic neutron scattering on elemental copper were determined in the energy range from 6.95 MeV to 14.18 MeV at eight incident energies. The data were derived by comparing the net time-of-flight spectra with calculated spectra using a realistic Monte Carlo simulation. The time-of-flight measurement was accompanied by extensive and careful calibrations. The copper cross sections have been normalized to hydrogen scattering. The disturbing breakup scattering fraction of the non-monoenergetic DD neutron source can be subtracted after having been calculated by a Monte Carlo simulation. The data for such a calculation are checked and adjusted using an additional pure breakup neutron source based on the

^{4}He(d,np)^{4}He reaction. By proper subtraction of the breakup fractions, double-differential cross sections can be obtained for neutron emission energies down to 1.5 MeV. Partial inelastic cross sections could be determined for a number of low-lying levels of the two copper isotopes. Angle-integrated cross sections were derived by fitting Legendre polynomial expansions to the measured angular distributions using least-squares methods. The results of this work have been compared with those of other authors and with the ENDF/B-VI evaluation. (orig.)Primary Subject

Source

Dec 2006; 81 p; ISBN 3-86509-601-8; ; ISBN 978-3-86509-601-2; ; ISSN 0936-0492; ; Available from TIB Hannover: RO 8345(52)

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

BARYON REACTIONS, BARYONS, COPPER ISOTOPES, CROSS SECTIONS, DATA, DIFFERENTIAL CROSS SECTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FUNCTIONS, HADRON REACTIONS, HADRONS, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, MEV RANGE, NEUTRONS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, ODD-EVEN NUCLEI, SCATTERING, SPECTRA, STABLE ISOTOPES, TARGETS

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Reference NumberReference Number

INIS VolumeINIS Volume

INIS IssueINIS Issue

Physikalisch-Technische Bundesanstalt, Braunschweig (Germany). Neutronenphysik

AbstractAbstract

[en] Differential cross sections of elastic and inelastic neutron scattering on elemental silicon were determined in the energy range from 7.89 MeV to 13.85 MeV at 10 incident energies. The data were derived by comparing the net TOF spectra with calculated spectra using a realistic Monte Carlo simulation. The TOF measurement was accompanied by extensive and careful calibrations. The silicon cross sections have been normalized to hydrogen scattering. In addition to the elastic cross sections, 11 partial inelastic cross sections were measured at each energy attributed to excited levels or level groups in

^{28}Si,^{29}Si and^{30}Si. Angle-integrated cross sections were derived by fitting Legendre polynomial expansions to the measured angular distributions using least-squares methods. The results of this work have been compared with those of other authors and with the ENDF/B-VI evaluation. (orig.)Primary Subject

Source

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

BARYON REACTIONS, BARYONS, CROSS SECTIONS, DATA, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, FERMIONS, HADRON REACTIONS, HADRONS, INFORMATION, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NEUTRONS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, NUMERICAL DATA, SCATTERING, SILICON ISOTOPES, STABLE ISOTOPES, TARGETS

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