Off-shell resonances in coupled channel problems

1979 ◽  
Vol 57 (6) ◽  
pp. 801-808 ◽  
Author(s):  
G. Pantis
Keyword(s):  
Nuclear Reactions ◽  
Bound State ◽  
Direct Reaction ◽  
Background Term ◽  
Separable Potentials ◽  
State Behaviour ◽  
Square Well ◽  
T Matrix ◽  
Coupled Channel ◽  
Channel Theory

The coupled channel theory of nuclear reactions is extended off the energy shell so that the T-matrix can be constructed to include both the direct reaction contribution and the contribution from the off-shell background scattering. This has been shown to be important for (d,p) stripping reactions to unbound states. Three soluble two-channel models with square well, δ-function, and separable potentials, are presented and the resonance and bound state behaviour is discussed in some numerical detail. The importance of the off-shell background term is also studied.

Accurate Three-Nucleon Bound-State Calculation with an Extended Separable Expansion of the Two-Body T -Matrix

1998 ◽  
Vol 23 (1-2) ◽  
pp. 53-73 ◽  
Author(s):  
Y. Koike ◽  
W. C. Parke ◽  
L. C. Maximon ◽  
D. R. Lehman
Keyword(s):  
Bound State ◽  
State Calculation ◽  
T Matrix ◽  
Separable Expansion ◽  
Bound State Calculation

ISOSPIN SYMMETRY BREAKING AND BRANCHING RATIO IN THE DEUTERON REACTIONS AT VERY LOW ENERGIES

2011 ◽  
Vol 20 (02) ◽  
pp. 576-581 ◽  
Author(s):  
A.I. KILIÇ ◽  
K. CZERSKI ◽  
P. HEIDE ◽  
A. HUKE ◽  
G. RUPRECHT ◽  
...  
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Branching Ratio ◽  
Target Material ◽  
Direct Reaction ◽  
Isospin Symmetry ◽  
Total Cross Sections ◽  
Theoretical Approaches ◽  
Low Energies ◽  
Isospin Symmetry Breaking

The target-material dependence of the neutron-proton branching ratio and breaking of the isospin symmetry in the the 2H(d, n)3He and 2H(d, p)3H reactions at very low deuteron energies have been investigated. Angular distributions and total cross sections of the proton and neutron mirror channels have been measured for nuclear reactions taking place in different metallic environments. For Sr , Li , Na targets, we have found a first evidence for an alteration of the neutron-proton branching ratio and angular anisotropy of the neutron channel. We discuss various theoretical approaches explaining isospin mixing effects both in gas and metallic target experiments including a deuteron polarization in the crystal lattice. Direct reaction contribution has been calculated within the zero range distorted wave Born approximation (DWBA).

scholarly journals Study of Deuteron Stripping Reaction by Coupled Channel Theory. I

1969 ◽  
Vol 41 (2) ◽  
pp. 391-418 ◽  
Author(s):  
Takashi Ohmura ◽  
Bunryu Imanishi ◽  
Munetake Ichimura ◽  
Mitsuji Kawai
Keyword(s):  
Deuteron Stripping ◽  
Coupled Channel ◽  
Channel Theory
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