scholarly journals Microscopic calculation of in-medium nucleon-nucleon cross sections

1993 ◽  
Vol 48 (4) ◽  
pp. 1702-1712 ◽  
Author(s):  
G. Q. Li ◽  
R. Machleidt
Keyword(s):  
Cross Sections ◽  
Nucleon Nucleon ◽  
Microscopic Calculation

Energy dependence of nucleon-nucleon inelastic total cross-sections

1987 ◽  
Vol 48 (11) ◽  
pp. 1901-1924 ◽  
Author(s):  
J. Bystricky ◽  
P. La France ◽  
F. Lehar ◽  
F. Perrot ◽  
T. Siemiarczuk ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
Nucleon Nucleon ◽  
Total Cross Sections

Dominance of nucleon-nucleon interactions inα+C12total reaction cross sections

1982 ◽  
Vol 26 (1) ◽  
pp. 301-303 ◽  
Author(s):  
R. M. DeVries ◽  
N. J. DiGiacomo ◽  
J. S. Kapustinsky ◽  
J. C. Peng ◽  
W. E. Sondheim ◽  
...  
Keyword(s):  
Cross Sections ◽  
Nucleon Nucleon ◽  
Reaction Cross ◽  
Nucleon Interactions ◽  
Reaction Cross Sections

Nucleon-antinucleon interaction in the new Tamm-Dancoff approximation

1960 ◽  
Vol 257 (1288) ◽  
pp. 59-73
Keyword(s):  
Integral Equation ◽  
Wave Function ◽  
Cross Sections ◽  
Nucleon Nucleon ◽  
Phase Shifts ◽  
Exchange Term ◽  
Total Cross Sections ◽  
Nucleon Wave Function ◽  
Usual Manner ◽  
Order Of Magnitude

The nucleon-antinucleon ( N-N ) problem is formulated in the new Tamm-Dancoff (NTD) approximation in the lowest order, and the integral equation for N-N̅ scattering derived, taking account of both the exchange and annihilation interactions. It is found convenient to represent the N-N̅ wave-function as a 4 x 4 matrix, rather than the usual 16 x 1 matrix for the nucleon-nucleon wave-function, and a complete correspondence is established between these two representations. The divergences associated with the annihilation interaction and their renormalization are discussed in detail in the following paper (Mitra & Saxena 1960; referred to as II). The integral equation with the exchange interaction alone, is then separated into eigenstates of T, J, L and S in the usual manner and the various phase shifts obtained. The results of II for the contribution of the annihilation term are then used to calculate the complete phase shifts from which the various cross-sections (scattering and charge exchange) are derived. The results indicate that while the exchange term alone gives too small values for the total cross-sections versus energy, inclusion of the annihilation interaction without renormalization effects makes the cross-sections nearly three times larger than those observed. On the other hand, inclusion of the finite effects of renormalization (which manifest themselves essentially as a suppression of the virtual meson propagator) brings down these cross-sections to the order of magnitude of the observed ones.

PIONIC FUSION AT SUBTHRESHOLD ENERGIES

2009 ◽  
Vol 24 (02n03) ◽  
pp. 539-543
Author(s):  
L. JOULAEIZADEH ◽  
J. BACELAR ◽  
M. ESLAMI-KALANTARI ◽  
I. GAŠPARIĆ ◽  
N. KALANTAR-NAYESTANAKI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Pion Production ◽  
Detection System ◽  
Nucleon Nucleon ◽  
Accelerator Facility ◽  
Production Threshold ◽  
Neutral Pions ◽  
Pion Production Threshold ◽  
Plastic Ball ◽  
Large Acceptance

In order to study the role of pions and clustering phenomena in nuclei, two experiments have been performed using the AGOR accelerator facility. In collisions of two nuclei a pion and a fused nucleus were produced. The examined reactions were 4He(3He, π0)7Be and 6Li(4He, π0)10B at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). Since the available energy is well below the pion production threshold in an elementary nucleon-nucleon process, a highly coherent mechanism is needed. We identified the reaction by measuring the fused system in the magnetic spectrometer and the produced neutral pions in the Plastic Ball detection system with large acceptance. Our experimental setup provided the exclusive cross sections by identifying all products in overdetermined kinematics. Here we present the preliminary results of the analysis for the second reaction. Angular distribution of neutral pions will be discussed.

Nucleon-nucleon phase variation and in-medium effects on elastic scattering cross sections

2020 ◽  
Vol 95 (9) ◽  
pp. 095301
Author(s):  
M Y H Farag ◽  
I I A Bashter ◽  
I A M Abdul-Magead ◽  
M M H El-Azony
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Phase Variation ◽  
Nucleon Nucleon ◽  
Medium Effects ◽  
Scattering Cross ◽  
Scattering Cross Sections

Microscopic Calculation of Absolute Values of Two-nucleon Transfer Cross Sections

2009 ◽  
Author(s):  
G. Potel ◽  
B. F. Bayman ◽  
F. Barranco ◽  
E. Vigezzi ◽  
R. A. Broglia ◽  
...  
Keyword(s):  
Cross Sections ◽  
Nucleon Transfer ◽  
Microscopic Calculation
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