scholarly journals Angular Distributions in the Reactions 11B(d, p)12B and 11B(d, a)9Be

1965 ◽  
Vol 18 (5) ◽  
pp. 491 ◽  
Author(s):  
DG Sargood ◽  
GD Putt
Keyword(s):  
Reaction Mechanism ◽  
Nuclear Reactions ◽  
Angular Distributions ◽  
Distorted Wave ◽  
Direct Mechanism

In recent years considerable interest has centred on the reaction mechanism in nuclear reactions. At bombarding energies of above about 5 MeV, it has been apparent for many years that (d, p) and (d, n) reactions tend to be dominated by the direct stripping reaction. With the advent of distorted wave stripping theories such as those of Tobocman (1959) and Robson (1961), it now appears that those reactions may proceed by a direct mechanism even at very low bombarding energies. Robson and Weigold (1963) have satisfactorily analysed the angular distributions obtained in the reaction llB(d, p)12B at bombarding energies of 1�02 MeV and 700keV.

Analysing powers and differential cross sections of (3He,p) reactions on 6Li and 7Li at low energy

1995 ◽  
Vol 73 (1-2) ◽  
pp. 74-84 ◽  
Author(s):  
D. Baddou ◽  
C. Rioux ◽  
R. J. Slobodrian ◽  
J. M. Nelson
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Born Approximation ◽  
Low Energy ◽  
Angular Distributions ◽  
Differential Cross Sections ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Nucleon Transfer ◽  
Cluster Transfer

Angular distributions of the differential cross sections and analysing powers were measured at an energy of 4.6 MeV. The results are compared with the distorted wave Born approximation predictions for two-nucleon transfer and for a deuteron-cluster transfer. The agreement is qualitative at best, and a discussion of alternatives to improve it is presented.

scholarly journals Precision measurements on oxygen formation in stellar helium burning with gamma-ray beams and a Time Projection Chamber

2021 ◽  
Author(s):  
Robin Smith ◽  
Moshe Gai ◽  
Sarah Stern ◽  
Deran Schweitzer ◽  
Mohammad Ahmed
Keyword(s):  
Time Projection Chamber ◽  
Gamma Ray ◽  
Nuclear Reactions ◽  
Angular Distributions ◽  
Helium Burning ◽  
Low Energies ◽  
Important Input ◽  
Novel Method ◽  
Time Projection ◽  
First Time

Abstract Stellar Evolution theory relies on our knowledge of nuclear reactions, with the carbon/oxygen (C/O) ratio, at the end of helium burning, being the single most important input. However, the C/O ratio is still not known with sufficient accuracy, due to large uncertainties in the cross section for the fusion of helium with 12C to form 16O, denoted as the 12C(α,γ)16O reaction. We present initial results at moderately low energies using a novel method, which is significantly different from the experimental efforts of the past four decades. Precise angular distributions of the 12C(α,γ)16O reaction were obtained by measuring the inverse 16O(γ,α)12C reaction with gamma-beams and a Time Projection Chamber detector. These allowed us to measure, for the first time, the interference angle of the l = 1 and 2 partial waves contributing to this reaction (φ12), which agrees with predictions based on the unitarity of the scattering matrix.

Reaction mechanism of proton-induced pre-equilibrium α-particle emission from medium-mass nuclei at incident energies between 65 and 160MeV

2018 ◽  
Vol 27 (11) ◽  
pp. 1850091 ◽  
Author(s):  
S. S. Dimitrova ◽  
A. A. Cowley ◽  
E. V. Zemlyanaya ◽  
K. V. Lukyanov
Keyword(s):  
Reaction Mechanism ◽  
Composite Particle ◽  
Particle Emission ◽  
Angular Distributions ◽  
Medium Mass ◽  
Multistep Process ◽  
Equilibrium Emission ◽  
Analyzing Power

The intrinsic reaction mechanism of proton-induced composite particle pre-equilibrium emission is well known to be a statistical multistep process. However, until recently it was still not clear how important the competition between pickup and knockout is to produce a composite ejectile in the multistep sequence. An evaluation of recent ([Formula: see text]) results at incident energies from 65 to 160[Formula: see text]MeV and on representative target nuclei is presented. The virtue of analyzing power angular distributions to unravel the details of the reaction mechanism is discussed and future possible avenues of investigation are explored.

Time violating amplitudes in the (3He, p) reactions

1988 ◽  
Vol 66 (7) ◽  
pp. 612-617 ◽  
Author(s):  
Ali E. Khalil
Keyword(s):  
Reaction Mechanism ◽  
Time Reversal ◽  
Born Approximation ◽  
Interaction Strength ◽  
Direct Reaction ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Dwba Calculation ◽  
Hermitian Conjugate ◽  
The Difference

The difference between the polarization (P) of protons in the reaction (3He, [Formula: see text]) and the analyzing power (A) in the inverse reaction ([Formula: see text], 3He) has been calculated using a spin-independent isospin-independent, time reversal violating interaction in the form [α(r)[Formula: see text] + Hermitian conjugate]. The interaction strength is adjusted to be 1% of the time conserving optical potentials. A distorted-wave Born approximation (DWBA) calculation assuming a direct reaction mechanism has been performed. The relative values of the time violating amplitudes have no signatures for any measurable time violating effects.

Ejectile angular distributions in Boltzmann master equation theory of nuclear reactions

1997 ◽  
Vol 405 (3-4) ◽  
pp. 219-223 ◽  
Author(s):  
M. Cavinato ◽  
E. Fabrici ◽  
E. Gadioli ◽  
E. Gadioli Erba ◽  
E. Risi
Keyword(s):  
Master Equation ◽  
Nuclear Reactions ◽  
Angular Distributions
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