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.

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 Sub-Coulomb Stripping in the 124Sn(d,p)125Sn Reaction

1971 ◽  
Vol 24 (4) ◽  
pp. 793 ◽  
Author(s):  
DL Powell ◽  
PJ Dallimore ◽  
WF Davidson
Keyword(s):  
Optical Model ◽  
Angular Distributions ◽  
Model Parameters ◽  
Spectroscopic Factors

Angular distributions for the reaction 124Sn(d, p)125Sn leading to the unresolved ground and O� 026 MeV levels and to the 0'210, O� 936, 1 -257, 1� 362, and 1 . 540 MeV levels of 125Sn have been measured with deuteron energies of 5� 1 and 12-0MeV. Spectroscopic factors have been extracted using the DWBA theory. The dependence of the calculations on various assumptions of the theory has been studied by comparing the results at both energies. The sub-Coulomb data have been found to yield more reliable spectroscopic factors because of the lack of sensitivity to the optical model parameters used in the distorting potentials.

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.

Detailed study for 16O → 12C + α and 12C → 11B + p spectroscopic factors

2014 ◽  
Vol 23 (10) ◽  
pp. 1450061 ◽  
Author(s):  
Sh. Hamada ◽  
N. Burtebayev ◽  
N. Amangeldi
Keyword(s):  
Elastic Scattering ◽  
Excitation Function ◽  
Optical Model ◽  
Transfer Reaction ◽  
Spectroscopic Factor ◽  
Ion Beam ◽  
Angular Distributions ◽  
Model Potentials ◽  
Spectroscopic Factors ◽  
Double Folding

We have measured the angular distributions for 16 O elastically scattered on 12 C nuclei at energy 28 MeV and also for 12 C ion beam elastically scattered on 11 B target nuclei at energy 18 MeV. These measurements were performed in the cyclotron DC-60 INP NNC RK. Calculations were performed using both empirical Woods–Saxon and double folding optical model potentials. Both elastic scattering and transfer reaction were taken into consideration. We have extracted the spectroscopic factors for the configurations 16 O → 12 C + α and 12 C → 11 B + p and compared them with other calculated or extracted values at different energies from literature. The extracted spectroscopic factor for the configuration 12 C → 11 B + p from the current work is in the range 2.7–3.1, which is very close to Cohen–Kurath prediction. While for the configuration 16 O → 12 C + α, spectroscopic factors show fluctuation with energy which could be due to the well-known resonant-like behavior observed in 16 O + 12 C excitation function.

scholarly journals Thermonuclear Reaction Rates for Reactions Leading to N = 28 Nuclei

1995 ◽  
Vol 48 (1) ◽  
pp. 125
Author(s):  
A.J Morton ◽  
DG Sargood
Keyword(s):  
Statistical Model ◽  
Nuclear Reaction ◽  
Cross Sections ◽  
Optical Model ◽  
Reaction Rates ◽  
Reaction Cross ◽  
Model Parameters ◽  
Thermonuclear Reaction ◽  
Model Calculations ◽  
Reaction Cross Sections

Nuclear reaction cross sections derived from statistical-model calculations have been used in the calculation of thermonuclear reaction rates for 36 nuclei at temperatures that are representative of the interiors of evolving stars and supernovae as nucleosynthesis approaches the production of nuclei with N = 28. The statistical-model calculations used optical-model parameters in the particle channels which had been selected to give the best overall agreement between theoretical and experimental cross sections for reactions on stable target nuclei in the mass and energy ranges of importance for the stellar conditions of interest. The optical-model parameters used, and the stellar reaction rates obtained, are tabulated. Comparisons are made between these stellar rates and those from other statistical-model calculations in the literature.

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.

Cross Section Measurements for the Reactions 53Cr(p,g)54Mn, 53Cr(p,n)53Mn and 53Cr(p, p')53Cr

1981 ◽  
Vol 34 (1) ◽  
pp. 25 ◽  
Author(s):  
HJ Gardner ◽  
LW Mitchell ◽  
SR Kennett ◽  
MR Anderson ◽  
DG Sargood
Keyword(s):  
Statistical Model ◽  
Cross Section ◽  
Cross Sections ◽  
Proton Energy ◽  
Optical Model ◽  
Model Parameters ◽  
Model Calculations ◽  
Isobaric Analogue ◽  
Theory And Experiment

Cross sections have been measured for the reactions 53Cr(p, y)5 4Mn, 53Cr(p, n)53Mn and 53Cr(p, p/)53Cr over the proton energy range O'88-2'40 MeV. The results are compared with the predictions of statistical model, calculations with global optical model parameters, with particular reference to the role of isobaric analogue resonances. Satisfactory agreement between theory and experiment is achieved for all three reactions.

Angular distributions from ( d, p ) and ( d, n ) nuclear reactions

1951 ◽  
Vol 208 (1095) ◽  
pp. 559-579 ◽  
Keyword(s):  
Excited States ◽  
Ground State ◽  
Nuclear Reactions ◽  
Energy Levels ◽  
Angular Distributions ◽  
Angular Momenta ◽  
First Excited State ◽  
Compound Nucleus Formation ◽  
Initial Nucleus

Experimental angular distributions from (d, p) and (d, n) nuclear reactions involve con­tributions from incident angular momenta much higher than is compatible with compound nucleus formation, and indicate that these reactions must proceed to a large extent by means of a stripping process. The angular distributions to be expected from a stripping process are calculated, and these are found to be very sensitive to the angular momenta which can be accepted by the initial nucleus, i.e. to the spins and parities of the energy levels involved. In any one case there is found excellent agreement between the experimental curve and just one of the possible theoretical curves, and if the spin and parity of the ground state of the initial nucleus is known, this allows of a determination of the spin and parity of the appropriate level of the final nucleus. In this way it is found, for example, that the ground state of 17 O has spin ⅝ or ⅜ and even parity, and that the first excited state of 17 O (0.88 MeV above ground) has spin ½ and even parity. Determinations are also made of the spins and parities of the ground states and several excited states of 13 C, 15 N and 28 Al. Families of theoretical curves for a variety of incident and outgoing energies are presented in order to facilitate further spin and parity determinations from future experimental results.

scholarly journals Experimental Investigation of the Hyperfine Structure of Neutral Praseodymium Spectral Lines and Discovery of New Energy Levels

2016 ◽  
Vol 9 (1) ◽  
pp. 7 ◽  
Author(s):  
Shamim Khan ◽  
Imran Siddiqui ◽  
Syed Tanweer Iqbal ◽  
Zaheer Uddin ◽  
G. H. Guthöhrlein ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Laser Excitation ◽  
Energy Levels ◽  
Spectral Lines ◽  
Wave Number ◽  
Experimental Investigations ◽  
Angular Momenta ◽  
New Energy ◽  
Fourier Transform Spectrum

Experimental investigations of Pr I spectral lines were performed by means of laser induced fluorescence spectroscopy, using a hollow cathode discharge lamp as source of free atoms. The wavelengths for the laser excitation were found by the help of a highly resolved Fourier transform spectrum. Altogether we excited 236 unclassified lines and analysed their hyperfine structure, which led, together with the measured wavelengths of the observed fluorescence lines, to the discovery of 32 new even parity and 38 odd parity fine structure energy levels. These levels allow to classify more than 670 spectral lines of Pr I. The wave number calibrated Fourier transform spectrum allowed us to determine the energies of most of these newly discovered levels with an uncertainty of 0.015 cm-1. Angular momenta, parity, and magnetic and electric hyperfine interaction constants (A and B) of the new levels were also determined.

The 44Ca(d,α)42K Reaction at 4.0 MeV

1974 ◽  
Vol 52 (9) ◽  
pp. 772-778 ◽  
Author(s):  
S. T. Lee ◽  
D. D. Long
Keyword(s):  
Excitation Function ◽  
Born Approximation ◽  
Optical Model ◽  
Angular Distributions ◽  
Model Parameters ◽  
Direct Reaction ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation

The angular distributions from the 44Ca(d,α)42K reaction were measured at Ed = 4.0 MeV in a range of angles from 40° to 160°. Based on the observation of forward peaking of the angular distributions and diminished fluctuations at 4 MeV in the excitation function, an analysis was carried out utilizing the distorted wave Born approximation. For the five strongly excited levels below 1.3 MeV, satisfactory fits were obtained using optical model parameters from the literature. The results, which were consistent with the spin assignments from other experiments, revealed no gross inadequacies of a direct reaction analysis at this energy which are not present at higher energies. For three levels in42K, the range of spins was tentatively reduced. In the case of the 1.113 MeV level, no previous assignments had been made.

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