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.

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.

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.

Systematic nonlocal optical model potential for nucleons

2015 ◽  
Vol 24 (01) ◽  
pp. 1550006 ◽  
Author(s):  
Yuan Tian ◽  
Dan-Yang Pang ◽  
Zhong-Yu Ma
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Model Potential ◽  
Nucl Phys ◽  
Angular Distributions ◽  
Model Calculations ◽  
Analyzing Powers ◽  
Optical Model Potential ◽  
Fitting Procedures ◽  
Scattering Cross Sections

Based on the Perey–Buck nonlocal optical model potential, F. Perey and B. Buck, Nucl. Phys. 32 (1962) 353, we obtain a new set of nonlocal optical model potential (NLOMP) parameters for proton and neutron scattering off nuclei. The experimental angular distributions of nucleon scattering off nuclei ranging from 27 Al to 208 Pb with incident energies around 10 MeV to 30 MeV are adopted in the fitting procedures. This NLOMP is energy independent. The chi-squares χ2 obtained in the fittings are comparable to those from the KD03 phenomenological local optical model potentials (OMP) A. Koning and J. Delaroche, Nucl. Phys. A 713 (2003) 231. Good agreement is found in comparisons between optical model calculations using this NLOMP and KD03 in their reproduction to the experimental angular distributions of elastic scattering cross-sections and analyzing powers.

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.

The cross-section and angular distribution of the D-D reactions below 50 keV

1953 ◽  
Vol 216 (1124) ◽  
pp. 57-65 ◽  
Keyword(s):  
Angular Distribution ◽  
Total Cross Section ◽  
Cross Section ◽  
Proportional Counter ◽  
Angular Distributions ◽  
Asymmetry Coefficient ◽  
Gas Target ◽  
The Asymmetry ◽  
The Cross ◽  
Bombarding Energy

A thin gas target was used and the particles from the reactions were detected by a proportional counter. The results show that the total cross-section for the two reactions is the same to within 1%, but that the angular distributions of the products are significantly different. The asymmetry coefficient for the reaction D( d , n ) 3 He is given by 0·31 + 0·0058 E , compared with 0·13 + 0·0047 E for reaction D( d , p ) 3 H, where E is the bombarding energy in kilovolts.

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.

A position-sensitive proportional counter for magnetic spectrographs with a bent focal plane

1974 ◽  
Vol 121 (3) ◽  
pp. 605-607 ◽  
Author(s):  
L. Cleemann ◽  
B. Schimmer ◽  
K.H. Lauterjung
Keyword(s):  
Proportional Counter ◽  
Focal Plane ◽  
Position Sensitive

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.

Single-proton states in 155Eu

1979 ◽  
Vol 57 (2) ◽  
pp. 271-285 ◽  
Author(s):  
D. G. Burke ◽  
G. Løvhøiden ◽  
O. Straume ◽  
E. R. Flynn ◽  
J. W. Sunier
Keyword(s):  
Cross Sections ◽  
Alpha Particles ◽  
Angular Distributions ◽  
Tandem Accelerator ◽  
Analyzing Powers ◽  
Rotational Bands ◽  
Nilsson Model ◽  
Scientific Laboratory ◽  
Position Sensitive ◽  
Photographic Emulsions

The [Formula: see text] reaction was studied using 17 MeV polarized tritons from the tandem Van de Graaff accelerator at the Los Alamos Scientific Laboratory. The alpha particles were analyzed using a Q3D magnetic spectrometer and detected with a helical-cathode position-sensitive counter. The overall resolution was ~ 18 keV FWHM. Some additional exposures, performed using unpolarized tritons on a thinner target, had a resolution of ~ 12 keV FWHM and were helpful in the interpretation of a number of multiplets. Measurements of the 154Sm(α,t)155Eu reaction were made using 25 MeV alpha beams from the McMaster University tandem accelerator. The triton spectra were analyzed with a magnetic spectrograph using photographic emulsions for detectors, yielding a resolution of ~ 10 keV FWHM. By comparing the measured angular distributions of [Formula: see text] cross sections and analyzing powers with DWBA predictions it was possible to assign spins and parities to many levels. The present results confirm earlier assignments of rotational bands based on the low-lying 5/2+[413], 5/2−[532], and 3/2+[411] orbitals. In addition, states at higher excitation have now been assigned to the 1/2+[411], 1/2+[420], and 7/2+[404] orbitals, and a 3/2+[422] band is tentatively proposed. The spectroscopic strengths can be explained reasonably well by the Nilsson model when pairing and Coriolis mixing effects are included.

(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
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