Use of Al analyzing power

1979 ◽  
Vol 57 (4) ◽  
pp. 505-507 ◽  
Author(s):  
M. A. M. Shahabuddin ◽  
L. Buja-Bijunas ◽  
W. R. Stott ◽  
J. C. Waddington
Keyword(s):  
Cross Section ◽  
Optical Model ◽  
Angular Distributions ◽  
Model Parameters ◽  
Analyzing Power

The [Formula: see text] Al cross section and analyzing power angular distributions were measured at Ep = 17.0 MeV. The fits to the cluster DWBA calculations have shown that the analyzing power can play an important role in the determination of the correct optical model parameters.

Vector analyzing powers for the reaction to a transitional nucleus 147Nd

1977 ◽  
Vol 55 (19) ◽  
pp. 1697-1703 ◽  
Author(s):  
O. Straume ◽  
G. Løvhøiden ◽  
D. G. Burke ◽  
J. C. Waddington
Keyword(s):  
Cross Section ◽  
Proportional Counter ◽  
Focal Plane ◽  
Optical Model ◽  
Mass Region ◽  
Angular Distributions ◽  
Model Parameters ◽  
Analyzing Powers ◽  
Dwba Calculation ◽  
Position Sensitive

The [Formula: see text] reaction has been studied using 17 MeV deuterons with a vector polarization of ~0.75 from the McMaster University tandem Van de Graaff accelerator. Measurements were made at 18 angles from 6° to 57.5° using a magnetic spectrograph equipped with a position-sensitive proportional counter in the focal plane. It was found that the [Formula: see text] reaction is a very powerful technique for spin determinations in this mass region as the vector analyzing powers have quite large magnitudes. A DWBA calculation with optical model parameters previously optimized to fit cross-section angular distributions was also successful in predicting the analyzing powers for states of known spin and parity. The measured analyzing powers made it possible to give unambiguous spin assignments for over 15 states for which spin information was previously conflicting, incomplete, or lacking.

scholarly journals Neutron inelastic cross section measurements on 54Fe

2020 ◽  
Vol 239 ◽  
pp. 01010
Author(s):  
Adina Olacel ◽  
Catalin Borcea ◽  
Marian Boromiza ◽  
Philippe Dessagne ◽  
Gregoire Henning ◽  
...  
Keyword(s):  
Cross Section ◽  
Optical Model ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Analysis Procedure ◽  
Model Parameters ◽  
Electron Linear Accelerator ◽  
Section Measurement ◽  
Data Analysis Procedure ◽  
Experimental Values

A 54Fe(n, n'γ) cross section measurement was performed at the Geel Electron LINear Accelerator of EC-JRC, Geel using the Gamma Array for Inelastic Neutron Scattering spectrometer and a 235U fission chamber for flux normalization. The experimental results are presented in comparison with talys 1.9 default and tuned calculations. The tuned calculation, implying modifications of the optical model parameters, improved significantly the description of the experimental values and led to interesting conclusions regarding the interaction of the 54Fe nucleus with neutrons. Since the results of these calculations were already presented extensively in a dedicated paper, the present article focuses on details related to the experimental particularities and data analysis procedure.

Evaluation of Optical Model Potential Using Neutron Induced Cross Section Reaction for Spherical Uranium-238 Isotope up to 20MeV

2015 ◽  
Vol 59 ◽  
pp. 26-34
Author(s):  
Iman Tarik Al-Alawy ◽  
Ronak Ikram Ali
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Optical Model ◽  
Threshold Energy ◽  
Model Potential ◽  
Model Parameters ◽  
Incident Neutron ◽  
Optical Model Potential

The evaluation are based on mainly on the calculations of the nuclear optical model potential and relevant parameters are collected and selected from References Input Parameter Library (RIPL) which is being developed under the international project coordinated by the International Atomic Energy Agency (IAEA). The analyzing of a complete energy range has done starting from threshold energy for each reaction. The cross sections are reproduced in fine steps of incident neutron energy with 0.01MeV intervals with their corresponding errors. The recommended cross sections for available experimental data taken from EXFOR library have been calculated for all the considered neutron induced reactions for U-238 isotopes. The calculated results are analyzed and compared with the experimental data. The optimized optical potential model parameters give a very good agreement with the experimental data over the energy range 0.001-20MeV for neutron induced cross section reactions (n,f), (n,tot), (n,el), (n,inl), (n,2n), (n,3n), and (n,γ) for spherical U-238 target elements.

Incident-energy dependence of angular distributions of cross section and analyzing power for theNi58(p⃗,He3)Co56reaction between 80 and 120 MeV

2015 ◽  
Vol 91 (2) ◽  
Author(s):  
J. J. van Zyl ◽  
A. A. Cowley ◽  
R. Neveling ◽  
E. Z. Buthelezi ◽  
S. V. Förtsch ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Cross Section ◽  
Incident Energy ◽  
Angular Distributions ◽  
Analyzing Power

scholarly journals Optical Model Potential Using CINDA Library for Neutron Induced Cross Section Reactions for Spherical Uranium-235,238 Isotopes

2015 ◽  
Vol 60 ◽  
pp. 66-73
Author(s):  
Iman Tarik Al-Alawy ◽  
Ronak Ikram Ali
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Optical Model ◽  
Threshold Energy ◽  
Model Potential ◽  
Model Parameters ◽  
Incident Neutron ◽  
Optical Model Potential

The calculation are based mainly on the nuclear optical model potential and relevant parameters are collected and selected from References Input Parameter Library (RIPL) which is being developed under the international project coordinated by the International Atomic Energy Agency (IAEA). The analyzing of a complete energy range has done starting from threshold energy for each reaction. The cross sections are reproduced in fine steps of incident neutron energy with 0.01MeV intervals with their corresponding errors. The recommended cross sections for available experimental data taken from CINDA library have been calculated for all the considered neutron induced reactions for spherical U-235 and U-238 isotopes. The calculated results are analyzed and compared with the experimental data. The optimized optical potential model parameters give a very good agreement with the experimental data over the energy range 0.001-20MeV for neutron induced cross section reactions (n,f), (n,tot), (n,el), (n,inl), (n,2n), (n,3n), and (n,γ) for spherical U-235 and U-238 target elements.

Study of the 48Ti(α,p)51V and 50Ti(3He,d)51V Reactions

1971 ◽  
Vol 49 (8) ◽  
pp. 1053-1065 ◽  
Author(s):  
P. N. Maheshwari ◽  
U. C. Gupta ◽  
C. St-Pierre
Keyword(s):  
Optical Model ◽  
Energy Levels ◽  
Angular Distributions ◽  
Model Parameters ◽  
Model Calculations ◽  
Angular Momenta ◽  
Rotator Model ◽  
Spectroscopic Factors ◽  
New Energy ◽  
Bombarding Energy

The reactions 48Ti(α,p)51V at ten bombarding energies between 8.25 and 10.75 MeV and 50Ti(3He,d)51V at 10 MeV bombarding energy have been studied. Energy levels of 51V up to 4.85 and 6.17 MeV have been observed by (α,p) and (3He,d) reactions respectively. The (α,p) reaction yielded many new energy levels. The angular distributions for deuterons were measured at lab angles between 15° and 120°, and compared with predictions of DWBA calculations using the TSALLY code from which the transferred angular momenta and spectroscopic factors were deduced. These experimental results are examined from the viewpoint of shell model and strong coupling rotator model calculations. The effect of changing various optical model parameters is also discussed.

(p, n) Cross Section and Proton Optical-Model Parameters in the 4- to 5.5-Mev Energy Region

1959 ◽  
Vol 115 (4) ◽  
pp. 925-927 ◽  
Author(s):  
Richard D. Albert
Keyword(s):  
Cross Section ◽  
Energy Region ◽  
Optical Model ◽  
Model Parameters

scholarly journals Differential Cross Sections for the 13C(3He, p0) and 15N(3He, p0) Reactions at 15 MeV

1975 ◽  
Vol 28 (3) ◽  
pp. 247 ◽  
Author(s):  
J Havloujian ◽  
G Ravalli ◽  
BM Spice
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Optical Model ◽  
Residual Nucleus ◽  
Angular Distributions ◽  
Model Parameters ◽  
Differential Cross Sections ◽  
Channel Parameters ◽  
Free Parameters ◽  
Bombarding Energy

The angular distributions of the ground state proton groups from 3He-induced reactions with 13C and BN targets have been measured at a bombarding energy of 15 MeV. The DWBA program DWUCK has been used to fit the differential cross sections with no free parameters. The optical model parameters for the proton-residual nucleus channel were taken from the literature, and the 3He-target nucleus channel parameters were obtained by fitting the 3He elastic scattering differential cross sections.

scholarly journals A simple angle integration method for the determination of capture reaction cross sections

2019 ◽  
Vol 24 ◽  
pp. 129
Author(s):  
V. Michalopoulou-Petropoulou ◽  
V. Lagaki ◽  
M. Axiotis ◽  
V. Foteinou ◽  
A. Lagoyannis ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Integration Method ◽  
Reaction Cross ◽  
Angular Distributions ◽  
Distribution Method ◽  
Hpge Detectors ◽  
Secondary Transitions ◽  
Reaction Cross Sections

In order to determine the cross section of a reaction by the angular distribution method, it is essential to calculate the angular distributions of all secondary transitions that lead to the ground state. This is achieved by analysing spectra from HPGe detectors at various detection angles, which is a time consuming process. In this work, a simpler angle integration method is presented that allows to determine cross sections of capture reactions by measuring spectra at fewer detection angles.

Comparative study of alpha + nucleus elastic scattering using different models

2015 ◽  
Vol 24 (01) ◽  
pp. 1550003 ◽  
Author(s):  
A. H. Al-Ghamdi ◽  
Awad A. Ibraheem ◽  
M. El-Azab Farid
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Optical Potential ◽  
Optical Model ◽  
Distribution Density ◽  
Cluster Structure ◽  
Nucleon Nucleon ◽  
Angular Distributions ◽  
Nucleon Interaction ◽  
Nucleon Nucleon Interaction

The alpha (α) elastic scattering from different targets potential over the energy range 10–240 MeV has been analyzed in the framework of the single-folding (SF) optical model. Four targets are considered, namely, 24 Mg , 28 Si , 32 S and 40 Ca . The SF calculations for the real central part of the nuclear optical potential are performed by folding an effective α–α interaction with the α-cluster distribution density in the target nucleus. The imaginary part of the optical potential is expressed in the phenomenological Woods–Saxon (WS) form. The calculated angular distributions of the elastic scattering differential cross-section using the derived semimicroscopic potentials successfully reproduce 36 sets of data all over the measured angular ranges. The obtained results confirm the validity of the α-cluster structure of the considered nuclei. For the sake of comparison, the same sets of data are reanalyzed using microscopic double-folded optical potentials based upon the density-dependent Jeukenne–Lejeune–Mahaux (JLM) effective nucleon–nucleon interaction.

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