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.

scholarly journals Reactive Scattering of Oxygen Atoms With Iodine Molecules

1988 ◽  
Vol 9 (4-6) ◽  
pp. 277-288 ◽  
Author(s):  
N. C. Firth ◽  
N. W. Keane ◽  
D. J. Smith ◽  
R. Grice
Keyword(s):  
Differential Cross Section ◽  
Energy Distribution ◽  
Cross Section ◽  
Cross Correlation ◽  
Minor Component ◽  
Translational Energy ◽  
Reactive Scattering ◽  
Centre Of Mass ◽  
A Minor ◽  
Forward Hemisphere

Reactive scattering of O atoms with I2 molecules has been studied at an initial translational energy E~43 kJ mol−1 using cross-correlation time-of-flight analysis with resolution improved overprevious measurements. The broad centre-of-mass differential cross section favours the backward hemisphere with a product translational energy distribution lying above the distribution observed at lower initial translational energy but below the microcannonical RRHO distribution. However, a minor component with very low product translational energy favours the forward hemisphere. The observed scattering is attributed to a strongly bent OII triplet complex intermediate with a lifetime shorter than the period of overall rotation of the axis of the heavy II diatomic but long compared with the period of vibrational and rotational motion of the light O atom.

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°.

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.

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.

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.

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