scholarly journals p-Wave Strength in the Low-energy 7Li(p,?0)8Be Cross Section

1995 ◽  
Vol 48 (5) ◽  
pp. 813 ◽  
Author(s):  
FC Barker
Keyword(s):  
Angular Distribution ◽  
Shell Model ◽  
Cross Section ◽  
Low Energy ◽  
P Wave ◽  
Model Calculations ◽  
Energy Data

Recent fits to low-energy 7Li(p, "Yo)8Be angular distribution and analysing power data suggested a large p-wave strength. It is shown that acceptable fits to the data can be obtained by attributing the p-wave Ml contributions to the tails of the 17 �64 and 18 �15 MeV 1+ levels of 8Be, with p-wave strengths much less than those obtained previously, but only if some of the spectroscopic amplitudes have signs opposite to those suggested by shell model calculations and/or a fit to higher-energy data.

scholarly journals 8Be Level Properties from the Low-energy 7Li(p, γo)8Be Cross Section

1996 ◽  
Vol 49 (6) ◽  
pp. 1081 ◽  
Author(s):  
FC Barker
Keyword(s):  
Shell Model ◽  
Cross Section ◽  
Low Energy ◽  
Cross Section Data ◽  
Model Calculations ◽  
R Matrix ◽  
Section Data ◽  
Extensive Data

R-matrix fits to 7Li(p, γo)8Be cross section data for Ep ≤ 1500 keV give reduced width amplitudes of the 1+ levels of 8Be at 17.64 and 18.15 MeV having signs in agreement with shell model calculations, contrary to previous fits to less-extensive data.

scholarly journals No-core shell model calculations of the photonuclear cross section of 10B

2019 ◽  
Vol 55 (12) ◽  
Author(s):  
M. K. G. Kruse ◽  
W. E. Ormand ◽  
C. W. Johnson
Keyword(s):  
Shell Model ◽  
Cross Section ◽  
Core Shell ◽  
Model Calculations

Nucleon capture by 3He and the production of solar hep-neutrinos: Cross-section measurements and shell-model calculations

1991 ◽  
Vol 526 (2) ◽  
pp. 265-291 ◽  
Author(s):  
R. Wervelman ◽  
K. Abrahams ◽  
H. Postma ◽  
J.G.L. Booten ◽  
A.G.M. Van Hees
Keyword(s):  
Shell Model ◽  
Cross Section ◽  
Model Calculations

scholarly journals Measurement of proton-distribution radii of neutron-rich nitrogen isotopes

2019 ◽  
Vol 223 ◽  
pp. 01003
Author(s):  
Soumya Bagchi ◽  
Rituparna Kanungo ◽  
Wataru Horiuchi ◽  
Gaute Hagen ◽  
Titus D. Morris ◽  
...  
Keyword(s):  
Shell Model ◽  
Cross Section ◽  
Nitrogen Isotopes ◽  
Drip Line ◽  
Neutron Skin ◽  
Neutron Halo ◽  
Mean Square ◽  
Neutron Drip Line ◽  
Model Calculations ◽  
Good Agreement

Measurement of root-mean-square radii of proton distributions of 17–22N from charge-changing cross section shows the emergence of thick neutron skin towards the neutron-drip line. Signature of N = 14 shell gap has been found in nitrogen isotopes along with the emergence of neutron halo in 22N. The measured radii are in good agreement with the shell model calculations.

Angular distributions of recoil products from some reactions induced in 65Cu and 197Au by protons of energy 30–85 MeV

1968 ◽  
Vol 46 (22) ◽  
pp. 3551-3563 ◽  
Author(s):  
M. K. Dewanjee ◽  
G. B. Saha ◽  
L. Yaffe
Keyword(s):  
Angular Distribution ◽  
Inelastic Scattering ◽  
Center Of Mass ◽  
Interaction Mechanism ◽  
Direct Interaction ◽  
Low Energy ◽  
Angular Distributions ◽  
Approximate Symmetry ◽  
Mass System ◽  
Model Calculations

Angular distributions of products formed in the reactions 65Cu(p,pn)64Cu, 197Au(p,pn)I96Au, and 197Au(p,p3n)194Au in the range of proton energy 30–85 MeV were studied. The angular distribution results of 64Cu and 196Au show forward peaking at low energy and sidewise peaking at higher energies. Approximate symmetry about 90° was observed for the angular distribution of 194Au in the center-of-mass system. The experimental results have been compared with (a) Monte Carlo evaporation calculations, (b) cascade–evaporation calculations at 85 MeV for 64Cu, and (c) inelastic scattering plus evaporation calculations.Good agreement was obtained with statistical theory calculations at low energy and inelastic scattering model calculations at higher energies. The comparisons indicate that the reactions proceed by the compound nucleus mechanism at lower energies and the direct interaction mechanism predominates at higher energies.

Ionization of atomic hydrogen by protons in the energy range 60 to 400 keV

1964 ◽  
Vol 277 (1368) ◽  
pp. 137-141 ◽  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Born Approximation ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Low Energy ◽  
Absolute Cross Section ◽  
Energy Data ◽  
Beam Technique ◽  
Good Agreement

Ionization of atomic hydrogen by protons has been investigated by means of the ‘crossed beam ’ technique in which a proton beam from a Van de Graaff accelerator was arranged to intersect a modulated beam of atomic hydrogen produced from a furnace source. The ratio of the cross-section for ionization of atomic hydrogen to that for molecular hydrogen was determined by comparing the signals due to electrons arising from the interaction region when the beam was mainly atomic and when the beam was entirely molecular. The absolute cross-section for ionization of atomic hydrogen by protons was determined from a knowledge of the molecular cross-section. The results are in good agreement with the Born approximation calculations of Bates & Grilling and in fair agreement with the recent low energy data of Fite, Stebbings, Hummer & Brackmann.

THE CAPTURE OF PROTONS BY DEUTERONS

1962 ◽  
Vol 40 (4) ◽  
pp. 402-411 ◽  
Author(s):  
G. M. Griffiths ◽  
E. A. Larson ◽  
L. P. Robertson
Keyword(s):  
Angular Distribution ◽  
Total Cross Section ◽  
Energy Dependence ◽  
Cross Section ◽  
Gamma Rays ◽  
Proton Energy ◽  
P Wave ◽  
S Wave ◽  
Proton Capture ◽  
The Cross

The cross section and angular distribution of gamma rays for the reaction D(p,γ)He3 have been measured for proton energies from 275 kev to 1.75 Mev. For 275-kev protons the total cross section is 0.97 ± 0.11 microbarns and for 985-kev protons it is 3.5 ± 0.38 microbarns. The angular distribution has the form (sin2θ+b) where b is small. b is found to increase with decreasing proton energy, contrary to some previous results from this laboratory, and the energy dependence of b and of the cross section suggests that the sin2 θ part of the cross section is due to the capture of p-wave protons and the b part is due to s-wave proton capture.

scholarly journals Calculation of the 13N(p, ?)14O Cross Section at Low Energies

1985 ◽  
Vol 38 (5) ◽  
pp. 657 ◽  
Author(s):  
FC Barker
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Shell Model ◽  
Cross Section ◽  
Energy Region ◽  
Model Calculations ◽  
R Matrix ◽  
Considerable Uncertainty ◽  
First Excited State ◽  
Low Energies

R-matrix formulae are used to calculate the 13N(p, ?) 140 cross section in the energy region of astrophysical interest. Values of the R-matrix parameters are determined by fitting experimental data in 14C and 14N as well as 140, and by making use of shell model calculations where necessary. With the presently available data, there is considerable uncertainty in the predicted cross section, but this could be reduced appreciably by a measurement of the lifetime of the first excited state of 14C. With the preferred channel radius of about 5 fm, the predicted cross section is lower than those found in two previous calculations, which are discussed in some detail.

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