Elastische Streuung von Protonen an Bleikernen bei 19,2 GeV/c

1963 ◽  
Vol 18 (11) ◽  
pp. 1182-1184
Author(s):  
H. Going
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Proton Beam ◽  
Cross Section ◽  
Differential Cross ◽  
Forward Direction ◽  
Nuclear Scattering

The very well collimated 19,2 GeV/c CERN proton-beam hits a Pb-target. Small emulsions behind the target measure the angular distribution of scattered protons between 0.1° — 0.6°. This distribution yields a radius of interaction R=5.6 ·10-13 cm for Pb nuclei. The differential cross section for elastic nuclear scattering in the forward direction is found to be σ(0°) =2.15 ·105 barn/ster. These results are compared with those obtained by other authors.

Proton-proton scattering at 147 MeV

1952 ◽  
Vol 214 (1117) ◽  
pp. 262-272 ◽  
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Proton Beam ◽  
Cross Section ◽  
Differential Cross ◽  
Proton Scattering ◽  
Proton Proton ◽  
Absolute Differential ◽  
The Absolute ◽  
Limits Of Error

An external proton beam from the 110 in. Harwell cyclotron has been used to investigate proton-proton scattering at 147 MeV. The angular distribution of the scattering has been studied from 25 to 90° and found to be isotropic, within the limits of error. The absolute differential cross-section for scattering at 90° has been measured in two ways and found to be 4⋅94 ± 0⋅28 millibams. The results can also be used to find the 12 C( p , pn ) 11 C cross-section at 142 MeV.

SCATTERING AMPLITUDE ZERO IN dū→γH−

1988 ◽  
Vol 03 (12) ◽  
pp. 1199-1203 ◽  
Author(s):  
XIAO-GANG HE ◽  
H. LEW
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Higgs Bosons ◽  
Factorization Property ◽  
High Energies ◽  
Charged Higgs ◽  
Charged Higgs Bosons

In models with physical charged Higgs bosons, the angular distribution of dū→γH− exhibits a factorization property. The differential cross section has a zero at the scattering cos -1(-⅓) in the γH− C.M. frame. The processes [Formula: see text] are also studied. It is found, at high energies, that the contribution of the sea quarks are significant enough to wash the zero away.

scholarly journals Reactive Scattering of Oxygen Atoms With Bromine Molecules

1988 ◽  
Vol 9 (4-6) ◽  
pp. 265-276 ◽  
Author(s):  
N. C. Firth ◽  
N. W. Keane ◽  
D. J. Smith ◽  
R. Grice
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Rotational Motion ◽  
Correlation Time ◽  
Cross Correlation ◽  
Translational Energy ◽  
Reactive Scattering ◽  
Centre Of Mass

Reactive scattering of O atoms with Br2 molecules has been studied at an initial translational energy E~35 kJ mol−1 using cross-correlation time-of-flight analysis with resolution improved over previous measurements. The centre-of-mass differential cross section peaks in the forward and backward directions with a higher product translational energy for backward Scattering. The angular distribution traced at the peak of the product velocity distribution peaks more sharply in the forward than the backward direction but the angular distribution of product flux shows a distribution which is more nearly symmetrical about θ = 90°. The observed scattering is attributed to a triplet OBrBr complex intermediate with a lifetime which is shorter than the period of overall rotation of the axis of the heavy BrBr diatomic but which is long compared with the period of vibrational and rotational motion of the light O atom.

Angular distribution of the 3H(p,γ)4He reaction at proton energies below 1 MeV

1980 ◽  
Vol 58 (10) ◽  
pp. 1496-1499 ◽  
Author(s):  
W. Del Bianco ◽  
G. Kajrys
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Angular Range ◽  
Γ Rays ◽  
Γ Ray ◽  
Energy Dependent

The differential cross section of the 3H(p,γ)4He reaction has been measured at the proton energies Ep = 0.46, 0.50, 0.62, 0.77, and 0.93 MeV. A thin 3H–Ti target has been used and the γ-rays have been detected by a 12.7 cm diameter × 15.2 cm long NaI(Tl) crystal rotating over the angular range θL = 0 to 135°. The 3H(p,γ)4He reaction is found to proceed through E1, M1, and E2 transitions, E1 transitions being predominant. The ratio of the γ-ray flux at θL = 0 and 90° is energy dependent and decreases from 0.017 ± 0.003 at Ep = 0.46 MeV to 0.0078 ± 0.006 at Ep = 0.93 MeV.

scholarly journals Neutron-proton scattering at 156±3 MeV

1952 ◽  
Vol 213 (1114) ◽  
pp. 392-399 ◽  
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Proton Scattering ◽  
Centre Of Mass ◽  
Minimum Value

The angular distribution for neutron-proton scattering at 156 ± 3 MeV has been determined for centre-of-mass scattering angles between 50 and 178°. The ratio σ(π) / σ (1/2 π ) is 5·0, and the minimum value of the differential cross-section occurs at an angle between 75 and 85°.

scholarly journals Deep Minimum and a Vortex for Positronium Formation in Low-Energy Positron-Helium Collisions

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 56
Author(s):  
Albandari W. Alrowaily ◽  
Sandra J. Ward ◽  
Peter Van Reeth
Keyword(s):  
Velocity Field ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Forward Direction ◽  
Positronium Formation ◽  
Deep Minimum ◽  
Range Theory ◽  
Effective Range Theory

We find a zero in the positronium formation scattering amplitude and a deep minimum in the logarithm of the corresponding differential cross section for positron–helium collisions for an energy just above the positronium formation threshold. Corresponding to the zero, there is a vortex in the extended velocity field that is associated with this amplitude when one treats both the magnitude of the momentum of the incident positron and the angle of the scattered positronium as independent variables. Using the complex Kohn variational method, we determine accurately two-channel K-matrices for positron–helium collisions in the Ore gap. We fit these K-matrices using both polynomials and the Watanabe and Greene’s multichannel effective range theory taking into account explicitly the polarization potential in the Ps-He+ channel. Using the fitted K-matrices we determine the extended velocity field and show that it rotates anticlockwise around the zero in the positronium formation scattering amplitude. We find that there is a valley in the logarithm of the positronium formation differential cross section that includes the deep minimum and also a minimum in the forward direction.

scholarly journals Nucleon Resonances in the Photoproduction γp → K∗+Λ

2018 ◽  
Vol 46 ◽  
pp. 1860032
Author(s):  
F. Huang ◽  
A. C. Wang ◽  
W. L. Wang ◽  
H. Haberzettl ◽  
K. Nakayama
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Cross Section Data ◽  
Section Data ◽  
Spin Observables ◽  
Effective Lagrangian ◽  
Reaction Amplitude

The differential cross-section data from the CLAS Collaboration for [Formula: see text] have been analyzed based on an effective Lagrangian approach. The [Formula: see text]-channel [Formula: see text], [Formula: see text], [Formula: see text] exchanges, the [Formula: see text]-channel [Formula: see text] and near-threshold [Formula: see text]’s exchanges, the [Formula: see text]-channel [Formula: see text], [Formula: see text], [Formula: see text] exchanges, and the generalized contact term are considered in constructing the reaction amplitude. It is found that by including the [Formula: see text] resonance, which is responsible for the shape of the angular distribution of [Formula: see text] near the [Formula: see text] threshold, and one of the [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] resonances, one can describe the cross-section data for this reaction reasonably well. More experimental data on spin observables are needed to further pin down the resonance contents and associated resonance parameters in this reaction.

scholarly journals Measurement of the angular distribution of neutrons scattered from deuterium below 3 MeV

2020 ◽  
Vol 239 ◽  
pp. 01016
Author(s):  
Elisa Pirovano ◽  
Ralf Nolte ◽  
Markus Nyman ◽  
Arjan Plompen
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Detection Method ◽  
Pulse Height ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
Legendre Expansion

The differential cross section of neutron scattering on deuterium was investigated in the energy range from 400 keV to 2.5 MeV using the recoil detection method, irradiating with monoenergetic neutrons a proportional counter filled with deuterated gases. Comparing simulations of the transport of neutrons and recoil nuclei in the detector to the experimental pulse-height distribution, it was possible to establish a procedure for the determination of the coefficients of the Legendre expansion of the n-d angular distribution.

scholarly journals Excitation of the 9·50 MeV (9/2+) State of 13C in Intermediate Energy Scattering Experiments

1982 ◽  
Vol 35 (1) ◽  
pp. 9
Author(s):  
L Rickus ◽  
SF Collins ◽  
KA Amos ◽  
BM Spicer ◽  
GG Shute ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Angular Distribution ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Cross Section ◽  
Differential Cross ◽  
Total Angular Momentum ◽  
Intermediate Energy ◽  
Large Asymmetry ◽  
Mev Protons

The differential cross section for the inelastic scattering of 135 MeV protons leading to the9/2+ (9·5 MeV) state in 13C has been measured. Microscopic DWBA analyses show that the angular distribution is well described by a pure (or nearly pure) 1p3/2 to 1d5/2 neutron transition with a total angular momentum transfer of 4, a description which is consistent with the previously observed large asymmetry in inelastic π+ and π- scattering to this state.

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