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.

scholarly journals The 11B(3He,n0)13N Reaction

1977 ◽  
Vol 30 (2) ◽  
pp. 167 ◽  
Author(s):  
JR Davis ◽  
GU Din
Keyword(s):  
Elastic Scattering ◽  
Excitation Function ◽  
Cross Sections ◽  
Optical Model ◽  
Angular Distributions ◽  
Model Parameters ◽  
Direct Reaction ◽  
Reaction Component

The excitation function from 5�0 to 11� 5 MeV and angular distributions at 5� 2, 6� 5, 8� 0, 9�0, 10'0,11�0 and 12�0 MeV have been obtained for the "B(3He,no)13N reaction. "The data were analysed using an incoherent sum of Hauser-Feshbach and DWBA cross sections. Optical model parameters derived from elastic scattering experiments describe the direct reaction component reasonably well.

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.

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.

One-two step transfer observed in 16O+11B nuclear system

2015 ◽  
Vol 24 (06) ◽  
pp. 1550047 ◽  
Author(s):  
Sh. Hamada ◽  
N. Burtebayev
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Born Approximation ◽  
Optical Model ◽  
Ion Beam ◽  
Nuclear System ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Cluster Transfer ◽  
Spectroscopic Amplitude

The angular distribution measurements for 16O ion beam elastically scattered from 11 B target of thickness 32.9μg/cm2 at energy 22.4 MeV had been performed in the cyclotron DC-60 INP NNC RK. The previous measurements for 16 O +11 B nuclear system at energies 27, 30, 32.5 and 35 MeV showed an increase in the differential cross-section at backward angles due to the contribution of cluster transfer. Such transfer process could not be described in terms of optical model (OM); it could be described within the framework of distorted wave Born approximation method implemented in FRESCO code. Both one (5 Li ) and two-step transfer (proton transfer followed by Alpha transfer) were taken into considerations. We have extracted the spectroscopic amplitude (SA) for the configuration 16 O →11 B +5 Li .

The (3He,d) Reaction on 69Ga

1975 ◽  
Vol 53 (2) ◽  
pp. 117-122 ◽  
Author(s):  
J. P. Labrie ◽  
E. E. Habib ◽  
Z. Preibisz
Keyword(s):  
Born Approximation ◽  
Beam Energy ◽  
Incident Beam ◽  
Angular Distributions ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Model Calculations ◽  
Sum Rule ◽  
Pairing Model ◽  
Incident Beam Energy

Excited levels of 70Ge and proton holes in 69Ga have been investigated by means of the 69Ga (3He, d)70Ge reaction at an incident beam energy of 22.5 MeV. Angular distributions were measured and are compared with the prediction of the distorted-wave-Born-approximation (DWBA) theory in order to obtain the spectroscopic strengths of each level.The number of proton holes in 69Ga was obtained from the sum rule of the spectroscopic strengths. The vacancy probability UJ2 and the center of gravity energy EJ for the 2p3/2, 1f5/2, and 2p1/2 subshells are[Formula: see text]These are compared with the pairing model calculations.

NUCLEAR STRUCTURE OF 99Mo FROM THE (t,p) REACTION

2009 ◽  
Vol 18 (07) ◽  
pp. 1483-1496 ◽  
Author(s):  
M. A. RAHMAN ◽  
M. S. CHOWDHURY
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Born Approximation ◽  
Beam Energy ◽  
Nuclear Emulsion ◽  
Angular Distributions ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Model Predictions ◽  
Atomic Weapon

The 97 Mo (t,p)99 Mo reaction has been studied with the triton beam energy of 12 MeV obtained from tandem Van de Graaff accelerator at the Atomic Weapon Research Establishment, Aldermaston. Proton spectra were obtained at 12 different angles from 5° to 87.5° at an interval of 7.5° and were detected in nuclear emulsion plates. Angular distributions for transitions to 46 levels in the energy range from 0 to 2.054 MeV have been measured. Absolute differential cross-sections for the levels have been measured. The experimental angular distributions are compared with the distorted-wave Born approximation calculations (DWBA) to determine L and Jπ values. The present results are compared with the previous experimental results and model predictions.

scholarly journals A distorted wave Born approximation target strength model for Bering Sea euphausiids

2012 ◽  
Vol 70 (1) ◽  
pp. 204-214 ◽  
Author(s):  
Joy N. Smith ◽  
Patrick H. Ressler ◽  
Joseph D. Warren
Keyword(s):  
Bering Sea ◽  
Material Properties ◽  
Born Approximation ◽  
Target Strength ◽  
Model Parameters ◽  
Numerical Density ◽  
Strength Model ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Taper Function

Abstract Smith, J. N., Ressler, P. H., and Warren, J. D. 2013. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, 70:204–214. Acoustic surveys monitor euphausiid populations in the Bering Sea because of their importance as prey for walleye pollock and other organisms. Various scattering models exist to convert acoustic backscatter data to estimates of euphausiid numerical density or biomass, but a target strength (TS) model specific to Bering Sea euphausiids has not been available. This study parameterized a distorted wave Born approximation (DWBA) scattering model using physical (length and body shape) and material (density contrast, g, and sound speed contrast, h) properties measured from live euphausiids. All model parameters (length, shape, material properties, orientation) were evaluated for their effect on predicted TS. A polynomial function was used to describe animal shape and produced smaller TS estimates compared to a taper function, as is traditionally used in DWBA scattering models of euphausiids. Animal length was positively correlated with TS, but variations in other parameters (including material properties and orientation) also produced large changes in TS. Large differences in TS between estimates calculated using measured versus literature material property values caused large variations in acoustic estimates of euphausiid numerical densities (animals m−3) which emphasizes the importance of collecting site-specific g and h measurements when possible.

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