Direct determination of individual reaction cross sections for the two spin‐orbit states Ar+(2P3/2, 2P1/2)

1980 ◽  
Vol 73 (1) ◽  
pp. 586-588 ◽  
Author(s):  
Kenichiro Tanaka ◽  
Jean Durup ◽  
Tatsuhisa Kato ◽  
Inosuke Koyano
Keyword(s):  
Cross Sections ◽  
Direct Determination ◽  
Reaction Cross ◽  
Spin Orbit ◽  
Individual Reaction ◽  
Reaction Cross Sections

Nonequilibrium effects in α-particle induced reactions on gallium isotopes

1989 ◽  
Vol 67 (9) ◽  
pp. 870-875 ◽  
Author(s):  
I. A. Rizvi ◽  
M. K. Bhardwaj ◽  
M. Afzal Ansari ◽  
A. K. Chaubey
Keyword(s):  
Cross Sections ◽  
Residual Nucleus ◽  
Reaction Cross ◽  
Activation Technique ◽  
Individual Reaction ◽  
Reaction Channels ◽  
Stacked Foil Activation Technique ◽  
The Individual ◽  
Reaction Cross Sections

The stacked foil activation technique and Ge(Li) γ-ray spectroscopy have been employed for the determination of the excitation functions, up to 60 MeV, of six reactions, 69Ga(α,n), (α,2n), (α,3n), (α,p3n); 71Ga(α,n) and (α,4n). Since natural gallium used as the target has two odd-mass stable isotopes of abundance, 69Ga(60.1%) and 71Ga(39.9%), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of their theoretical cross sections. A preliminary theoretical comparison with the preequilibrium geometry-dependent hybrid (GDH) model has been done using an initial exciton number no = 4 (2n + 2p + 0h), and general agreement was found for all reactions at high energies.

Determination of (n, charged particle) reaction cross sections for frt-relevant materials

1986 ◽  
Vol 92 (1-4) ◽  
pp. 97-100 ◽  
Author(s):  
Syed M. Qaim ◽  
Robert Wölfle ◽  
Gerhard Stöklin ◽  
Mizanur Rahman ◽  
Sandor Sudar ◽  
...  
Keyword(s):  
Charged Particle ◽  
Cross Sections ◽  
Reaction Cross ◽  
Reaction Cross Sections

scholarly journals Chemical Reaction Kinematics

1968 ◽  
Vol 23 (12) ◽  
pp. 2080-2083 ◽  
Author(s):  
D. Hyatt ◽  
K. Lacmann
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Mass Spectrometer ◽  
Cross Sections ◽  
Impulse Approximation ◽  
Reaction Cross ◽  
Molecule Reaction ◽  
Polarization Theory ◽  
Reaction Cross Sections

A Bendix time of flight mass spectrometer has been modified to enable the determination of some ion-molecule reaction cross sections in the energy range 1 — 100 eV.In the reactions studiedX+ + D2 → XD++Dwhere X may be Ar, N2 or CO, the results obtained agree with the predictions of the polarization theory in the range below 10 eV despite the fact that no intermediate complex is formed at these energies. Between about 10—50 eV where spectator stripping occurs the cross section follows an approximate E-l dependence. Above these energies the results are consistent with a transition to a region in which knock-on processes predominate and where an impulse approximation treatment would be valid.

TOWARDS THE DETERMINATION OF THE π-p → f2(1270)n REACTION CROSS-SECTION

1993 ◽  
Vol 08 (25) ◽  
pp. 2343-2350 ◽  
Author(s):  
N. N. ACHASOV ◽  
G. N. SHESTAKOV
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Reaction Cross Section ◽  
Branching Ratios ◽  
Reaction Cross ◽  
Precise Estimation ◽  
The One ◽  
Reaction Cross Sections

In this letter, the necessity of a more precise estimation of the data on the reaction π-p → f2(1270)n → π0π0n is mentioned. The total cross-section σ(π-p → f2(1270)n) obtained from the data on the reaction π-p → π0π0n is shown to be approximately three times smaller than that following from the π-p → π+π-n data and also four times smaller than the prediction of the one-pion-exchange model. It is very important to resolve this disagreement because the results on the reaction π-p → f2(1270)n → π0π0n are used directly for the normalization of other reaction cross-sections and determination of branching ratios for some resonances.

Determination of (n,2n) Reaction Cross Sections for Some Nuclei with Asymmetry Parameter

2010 ◽  
Vol 29 (4) ◽  
pp. 387-394 ◽  
Author(s):  
İsmail Hakkı Sarpün ◽  
Hüseyin Ali Yalım ◽  
Rıdvan Ünal ◽  
Bekir Oruncak ◽  
Abdullah Aydın ◽  
...  
Keyword(s):  
Cross Sections ◽  
Asymmetry Parameter ◽  
Reaction Cross ◽  
Reaction Cross Sections

Chlorine atom spin–orbit branching ratios and total absolute reaction cross-sections for the H+DCl→HD+Cl reaction

2001 ◽  
Vol 340 (1-2) ◽  
pp. 71-76 ◽  
Author(s):  
Alexander Hanf ◽  
Almuth Läuter ◽  
Dhanya Suresh ◽  
Hans-Robert Volpp ◽  
Jürgen Wolfrum
Keyword(s):  
Chlorine Atom ◽  
Cross Sections ◽  
Branching Ratios ◽  
Reaction Cross ◽  
Spin Orbit ◽  
Absolute Reaction ◽  
Reaction Cross Sections

Analysis of the excitation function of alpha-particle-induced reactions on natural silver

1996 ◽  
Vol 74 (9-10) ◽  
pp. 618-625 ◽  
Author(s):  
H. B. Patel ◽  
M. S. Gadkari ◽  
Bhruna Dave ◽  
N. L. Singh ◽  
S. Mukherjee
Keyword(s):  
Cross Sections ◽  
Gamma Ray ◽  
Residual Nucleus ◽  
Reaction Cross ◽  
Activation Technique ◽  
Individual Reaction ◽  
Reaction Channels ◽  
Stacked Foil Activation Technique ◽  
The Individual ◽  
Reaction Cross Sections

Excitation functions of the reactions 107Ag[(α, n); (α, 2n); (α, αn); (α, α2n)] and,109Ag[(α, 2n); (α, 3n); (α, 4n); (α, α3n); (α, α4n)] were investigated up to 70 MeV by the stacked foil activation technique and Ge(Li) gamma-ray spectroscopy method. Since the natural silver used as the target has two odd mass stable isotopes of abundance 51.83% (107Ag) and 48.17% (109Ag), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of theoretical cross sections. The experimental cross sections were compared with the predictions of a pre-equilibrium hybrid model. The (α, xn) reactions are fairly well reproduced with initial exciton number n0 = 4(4p0h), whereas (α, αxn) reactions are underestimated in magnitude by a factor of five to six.

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