scholarly journals ISOSPIN DEPENDENCE OF THE η' MESON PRODUCTION IN NUCLEON-NUCLEON COLLISIONS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 458-461
Author(s):  
◽  
J. PRZERWA ◽  
P. MOSKAL ◽  
A. BUDZANOWSKI ◽  
E. CZERWIŃSKI ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Total Cross Section ◽  
Cross Section ◽  
Meson Production ◽  
Nucleon Nucleon ◽  
Preliminary Results ◽  
Isospin Dependence ◽  
Insight Into

A comparison of the close–to–threshold total cross section for the η' production in pp → ppη' and pn → pnη' reactions constitutes a tool to investigate the η' meson structure and the reaction mechanism in the channels of isospin I = 0 and I = 1 and may provide insight into the flavour-singlet (perhaps also into gluonium) content of the η' meson. In this contribution we present preliminary results of measurement of the quasi-free production of the η' meson in the proton-neutron collisions conducted using the COSY-11 facility.

STUDY OF THE η MESON PRODUCTION IN THE $\vec{d}+d\to{}^4He+\eta$ REACTION USING THE POLARIZED BEAM

2007 ◽  
Vol 22 (02n03) ◽  
pp. 523-527
Author(s):  
◽  
M. Lesiak ◽  
M. Abdel-Bary ◽  
A. Budzanowski ◽  
A. Chatterjee ◽  
...  
Keyword(s):  
Cross Section ◽  
Meson Production ◽  
Excess Energy ◽  
Unpolarized Cross Section ◽  
Preliminary Results ◽  
Polarized Beam

The measurement of the η meson production in [Formula: see text] reaction has been performed at the Big Karl magnetic spectograph at COSY synchrotron in Jülich. The vector and tensor polarized deuetron beam at the excess energy of Q=16 MeV was used. The preliminary results for the unpolarized cross section are presented here.

INFLUENCES OF THE ISOSPIN-DEPENDENCE OF IN-MEDIUM NUCLEON–NUCLEON CROSS-SECTION AND MOMENTUM DEPENDENT INTERACTION ON ISOSCALING PARAMETER

2008 ◽  
Vol 17 (04) ◽  
pp. 645-653 ◽  
Author(s):  
J. Y. LIU ◽  
HUAN FENG HAO ◽  
YONG ZHONG XING ◽  
WEI ZUO ◽  
XI GUO LEE
Keyword(s):  
Cross Section ◽  
Beam Energy ◽  
Neutron Number ◽  
Nucleon Nucleon ◽  
Quantum Molecular Dynamics ◽  
Central Collisions ◽  
Isotope Yield ◽  
Cross Section Formula ◽  
Isospin Dependence ◽  
Dependent Interaction

Influences of the isospin-dependent in-medium nucleon–nucleon cross-section [Formula: see text] and momentum-dependent interaction (MDI) on the isoscaling parameter α are investigated for two central collisions 40 Ca + 40 Ca and 60 Ca + 60 Ca . These collisions are with isospin dependent quantum molecular dynamics in the beam energy region from 40 to 60 MeV/nucleon. The isotope yield ratio R21(N, Z) for the above two central collisions depends exponentially on the neutron number N and proton number Z of isotopes, with an isoscaling. In particular, the isospin-dependent [Formula: see text] and MDI induce an obvious decrease of the isoscaling parameter α. The mechanism of the decreases of α by both [Formula: see text] and MDI are studied respectively.

PHOTOPRODUCTION OF π0π+ ON THE PROTON AND DEUTERON AT Eγ = 0.7 - 1.5 GeV

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1197-1204 ◽  
Author(s):  
A. MUSHKARENKOV ◽  
V. BELLINI ◽  
J. P. BOCQUET ◽  
L. CASANO ◽  
A. D'ANGELO ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Invariant Mass ◽  
Cross Section ◽  
Photon Energy ◽  
Mass Spectra ◽  
Photon Energy Range ◽  
Free Proton ◽  
Preliminary Results ◽  
Good Agreement

The preliminary results obtained by the GRAAL collaboration for the π0π+ photoproduction on the free and quasi-free proton (deuteron) at Eγ = 0.7-1.5 GeV are presented. The total cross section of the γp → π0π+n reaction and invariant mass spectra for the π+π0, π+n and π0n systems are presented in the photon energy range from 0.7 to 1.5 GeV. These results are in good agreement with the 2π-MAID calculations.

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