Photoproduction of positive pions from 16O at medium energies

1980 ◽  
Vol 58 (8) ◽  
pp. 1151-1162 ◽  
Author(s):  
V. Devanathan ◽  
V. Girija ◽  
G. N. Sivarama Prasad
Keyword(s):  
Experimental Data ◽  
Nuclear Structure ◽  
Cross Sections ◽  
Impulse Approximation ◽  
Wave Functions ◽  
Fair Agreement ◽  
Free Nucleon ◽  
Distorted Wave ◽  
Distorted Wave Impulse Approximation ◽  
Γ Ray

The reaction 16O(γ,π+)16N has been studied in the distorted wave impulse approximation (DWIA) using the free-nucleon photopion amplitude. The nuclear distortion effects on the emitted pion and also the effect of nuclear structure are investigated in detail. The effect of nuclear distortion is found to be small at lower energies but is of great importance resulting in large absorption of pions around the (3,3) resonance. Using realistic nuclear wave functions, it is found that the DWIA yields cross sections in fair agreement with the experimental data at γ-ray energies above 230 MeV but higher values at lower energies.

Charge-Exchange Scattering of Pions on 14N

1971 ◽  
Vol 49 (13) ◽  
pp. 1826-1827 ◽  
Author(s):  
Arlene P. Maclin ◽  
J. M. Eisenberg
Keyword(s):  
Experimental Data ◽  
Shell Model ◽  
Charge Exchange ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Impulse Approximation ◽  
Wave Functions ◽  
Exchange Scattering ◽  
Low Amplitude ◽  
Model Formalism

Cross sections for the reaction 14N(π+,π0)14O are calculated near the (3, 3) resonance using the impulse approximation together with the Chew–Low amplitude in the framework of a two-hole shell model formalism. Various sets of wave functions are used and comparisons are made with existing experimental data and other theoretical calculations.

Λ-HYPERNUCLEAR PRODUCTION IN $(K_{{\rm{stop}}}^-, \pi)$ REACTIONS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 663-664
Author(s):  
VOJTĔCH KREJČIŘÍK ◽  
ALEŠ CIEPLY
Keyword(s):  
Impulse Approximation ◽  
Wave Functions ◽  
Distorted Wave ◽  
Production Rates ◽  
Microscopic Description ◽  
Present Contribution ◽  
Final State ◽  
Distorted Wave Impulse Approximation ◽  
Transition Amplitudes ◽  
The Impact

In the present contribution, we report on calculation of the Λ-hypernuclear production induced by the stopped kaon K-. We performed the calculation within the framework of the distorted wave impulse approximation and used chirally motivated transition amplitudes for the microscopic description of the elementary kaon-nucleon process. The sensitivity of the model to several effects was tested with a special attention paid to the impact caused by variations of the initial kaon and final state pion wave functions. The calculated production rates are reported for target nuclei from Lithium to Oxygen.

Polarization transfer in (p, n) reactions

1987 ◽  
Vol 65 (6) ◽  
pp. 557-565 ◽  
Author(s):  
T. N. Taddeucci
Keyword(s):  
Nuclear Structure ◽  
Impulse Approximation ◽  
Intermediate Energy ◽  
Polarization Transfer ◽  
Final States ◽  
High Excitation ◽  
Distorted Wave ◽  
Indiana University ◽  
Excitation Energies ◽  
Distorted Wave Impulse Approximation

Polarization-transfer studies for (p, n) reactions with normally polarized (N-type) beams have been pursued at the Indiana University Cyclotron Facility, Bloomington, IN, since 1983. A variety of targets having values of A ranging from 2 to 90 have been studied at 0° for bombarding energies between 80 and 200 MeV. Transitions to well-resolved final states in the lighter nuclei have yielded data that lend plausibility to distorted-wave impulse approximation interpretations of intermediate-energy nucleon–nucleus reactions. Measurements on heavier nuclei have revealed interesting nuclear-structure effects at high excitation energies.

scholarly journals Intensities in Complex Spectra of Highly Ionized Atoms

1984 ◽  
Vol 86 ◽  
pp. 44-44
Author(s):  
M. Klapisch ◽  
A. Bar-Shalom ◽  
A. Cohen
Keyword(s):  
Cross Sections ◽  
Wave Functions ◽  
Coupling Scheme ◽  
Distorted Wave ◽  
Intermediate Coupling ◽  
Potential Wave ◽  
Excitation Cross Sections ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Efficient Program

We describe a package of programs for the implementation of the collisional-radiative model to complex configurations. The number of levels taken into account may be several hundreds. The heart of the package is a very efficient program for excitation cross sections in the Distorted Wave framework, using the Relativistic Parametric Potential wave functions. The basic jj coupling scheme actually simplified the computations, enabling a useful factorization into radial and angular parts. Intermediate coupling and configuration interactions are accounted for. We computed ratios of intensities of 3d9 − 3d84s (E2) to 3d9 −3d84p (El) transitions as functions of ne and Te in Xe XXVIII and other Co-like spectra. The atomic model involves all the levels of configurations (3p6)3d9; −3d84s, −3d84p, −3d84d, −3d84f, and (3p5) −3d10, −3d94p. (275 levels) and all the transitions between them. Results compare very well with experimental spectra from TFR.

Analyzing powers for theC12(p→,p′)C12reaction at 120 MeV and a test of the distorted-wave impulse approximation

1981 ◽  
Vol 24 (5) ◽  
pp. 1834-1843 ◽  
Author(s):  
J. R. Comfort ◽  
G. L. Moake ◽  
C. C. Foster ◽  
P. Schwandt ◽  
C. D. Goodman ◽  
...  
Keyword(s):  
Impulse Approximation ◽  
Distorted Wave ◽  
Analyzing Powers ◽  
Distorted Wave Impulse Approximation
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