DESCRIPTION OF SU(3) S-WAVE AND P-WAVE BARYONS

2003 ◽  
Vol 18 (02n06) ◽  
pp. 362-365
Author(s):  
MIKITO FURUICHI ◽  
KIYOTAKA SHIMIZU ◽  
Sachiko Takeuchi
Keyword(s):  
Quark Model ◽  
Excited States ◽  
Negative Parity ◽  
Nucleon Resonance ◽  
P Wave ◽  
Meson Exchange ◽  
Exchange Potential ◽  
Chiral Quark Model ◽  
S Wave ◽  
Quark System

We investigate the structure of the SU(3) octet and decuplet baryons employing a constituent chiral quark model. We study the ground, s-wave and p-wave excited states of the three-quark system with many range gaussian bases. The method, which we employ here, is shown to work quite well in describing the structure of the SU(3) s-wave and p-wave baryons. It is found that the mass differences between positive and negative parity states are well reproduced. It is also found that the pseudoscalar (ps) meson exchange potential plays a very important role in describing the mass of the nucleon resonance N*(1440) (roper). We also discuss how the semirelativistic approach works in the chiral quark model, and how to treat the potential terms in the semirelativistic approach.

scholarly journals Possible S-wave dibaryons in SU(3) chiral quark model

2000 ◽  
Vol 675 (1-2) ◽  
pp. 234-237 ◽  
Author(s):  
P.N. Shen ◽  
Q.B. Li ◽  
Z.Y. Zhang ◽  
Y.W. Yu
Keyword(s):  
Quark Model ◽  
Chiral Quark Model ◽  
S Wave

scholarly journals Gamma Ray Transitions following keV Neutron Capture in 2s-1d Shell Nuclei

1974 ◽  
Vol 27 (6) ◽  
pp. 759 ◽  
Author(s):  
MJ Kenny ◽  
PW Martin ◽  
LE Carlson ◽  
JA Biggerstaff
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Negative Parity ◽  
Mass Region ◽  
P Wave ◽  
S Wave

A Ge(Li) detector has been used to observe y-ray transitions after the capture of keV neutrons in natural samples of F, AI, Si, Sand Ar. Transitions to positive and negative parity states show that there are strong p-wave resonances as well as s-wave resonances in this mass region. The even-Z nuclei decay more by El transitions than by Ml. Odd-Z nuclei decay by strong Ml transitions.

scholarly journals Electron-capture and beta-decay modes with realistic nuclear structure calculations

2012 ◽  
Vol 20 ◽  
pp. 112
Author(s):  
P. G. Giannaka ◽  
T. S. Kosmas
Keyword(s):  
Excited States ◽  
Meson Exchange ◽  
Exchange Potential ◽  
Β Decay ◽  
Decay Modes ◽  
Nuclear Structure Calculations ◽  
Analytical Expressions ◽  
Structure Calculations ◽  
Gamow Teller

In this work, we concentrate on the e-capture and β-decay processes in isotopes that are important for searching the explosive nucleosynthesis in massive stars. To this aim, we improved our codes which use compact analytical expressions for the required reduced matrix elements of all basic multipole operators (isospin repre- sentation). The ground state of the nuclear isotopes chosen, is constructed in the context of the BCS method while their excited states are calculated by solving the QRPA equations, using as residual two-body interactions that of the Bonn C-D one-meson exchange potential. We focus on the role of the charged Gamow-Teller and Fermi transitions in Fe group nuclei that are the main constituents of the core in presupernovae formation.

ON NONLEPTONIC DECAYS OF THE Λ0-HYPERON IN THE EFFECTIVE QUARK MODEL WITH CHIRAL U(3)×U(3) SYMMETRY

2007 ◽  
Vol 22 (10) ◽  
pp. 1835-1847 ◽  
Author(s):  
A. YA. BERDNIKOV ◽  
YA. A. BERDNIKOV ◽  
M. FABER ◽  
A. N. IVANOV ◽  
V. A. IVANOVA ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Rest Frame ◽  
Laboratory Frame ◽  
Decay Rates ◽  
P Wave ◽  
Angular Distributions ◽  
S Wave ◽  
Nonleptonic Decays ◽  
Theoretical Results

Within the effective quark model with chiral U (3) × U (3) symmetry we calculate the S-wave and P-wave amplitudes and the partial widths of the nonleptonic decays of the Λ0-hyperon, Λ0 → pπ- and Λ0 → nπ0. The theoretical results agree well with the experimental data. The angular distributions of the decay rates in dependence on the polarizations of baryons are analyzed both in the laboratory frame and in the rest frame of the Λ0-hyperon.

scholarly journals P-WAVE ΛN-ΣN COUPLING AND THE SPIN-ORBIT SPLITTING OF $_\Lambda^9 {\rm{Be}}$

2009 ◽  
Vol 24 (11n13) ◽  
pp. 1031-1034 ◽  
Author(s):  
Y. FUJIWARA ◽  
M. KOHNO ◽  
Y. SUZUKI
Keyword(s):  
Quark Model ◽  
Scalar Meson ◽  
P Wave ◽  
Meson Exchange ◽  
Spin Orbit ◽  
Orbit Splitting ◽  
Full Account ◽  
Baryon Interaction ◽  
Spin Orbit Splitting ◽  
Orbit Potential

We reexamine the spin-orbit splitting of [Formula: see text] excited states in terms of the SU6 quark-model baryon-baryon interaction. The previous folding procedure to generate the Λα spin-orbit potential from the quark-model ΛN LS resonating-group kernel predicted three to five times larger values for ΔEℓs = Ex(3/2+) - Ex(5/2+) in the model FSS and fss2. This time, we calculate Λα LS Born kernel, starting from the LS components of the nuclear-matter G-matrix for the Λ hyperon. This framework makes it possible to take full account of an important P-wave ΛN-ΣN coupling through the antisymmetric LS(-) force involved in the Fermi-Breit interaction. We find that the experimental value, [Formula: see text], is reproduced by the quark-model G-matrix LS interaction with a Fermi-momentum around kF = 1.0 fm -1, when the model FSS is used in the energy-independent renormalized RGM formalism. On the other hand, the model fss2 gives too large splitting of almost 200 keV, owing to the uncanceled contribution of the scalar-meson exchange LS components.

ON NONLEPTONIC Σ+ → pπ0 DECAY IN THE EFFECTIVE QUARK MODEL WITH CHIRAL U(3) × U(3) SYMMETRY

2007 ◽  
Vol 22 (25) ◽  
pp. 4651-4666
Author(s):  
A. YA. BERDNIKOV ◽  
YA. A. BERDNIKOV ◽  
M. FABER ◽  
A. N. IVANOV ◽  
V. A. IVANOVA ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Partial Width ◽  
P Wave ◽  
Nonleptonic Decay ◽  
S Wave ◽  
Theoretical Results

Within the effective quark model with chiral U (3) × U (3) symmetry we calculate the S-wave and P-wave amplitudes of the nonleptonic decay Σ+ → pπ0, the partial width and the dynamical polarization of the proton in the dependence on the polarization of the Σ+-hyperon. The theoretical results agree well with the experimental data.

NEW HADRON STATES

2008 ◽  
Vol 17 (02) ◽  
pp. 283-322 ◽  
Author(s):  
SHI-LIN ZHU
Keyword(s):  
Quark Model ◽  
P Wave ◽  
Underlying Structure ◽  
S Wave ◽  
Charmed Mesons ◽  
Exotic Mesons ◽  
Hadron Spectroscopy ◽  
Threshold Enhancement ◽  
Dynamical Lattice ◽  
Decay Threshold

In the past four years we have witnessed the renaissance of the hadron spectroscopy. Many interesting new hadron states were discovered experimentally, some of which do not fit into the quark model easily. I will give a concise overview of these states and their possible interpretations. Topics covered in this review are: (1) candidates of new light hadrons including [Formula: see text] threshold enhancement, X(1835), X(1576), f0(1810), recent candidates of the 1-+ exotic mesons, Y(2175), [Formula: see text] threshold enhancement etc. (2) charmed mesons including p-wave non-strange charmed mesons, Dsj(2317) and Dsj(2460), recent candidates of higher excited charmed mesons, Dsj(2632) etc. (3) charmonium and charmonium-like states such as X(3872), Y(4260), X(3940), Y(3940), Z(3930) etc. The effect from the nearby S-wave open channels on the quark model spectrum above or near strong decay threshold is emphasized. Dynamical lattice simulations of DK and [Formula: see text] scattering and the extraction of their phase shifts may help resolve the underlying structure of Dsj(2317), Dsj(2460) and X(3872).

LIGHT BARYON SPECTRUM IN A CHIRAL QUARK MODEL

1999 ◽  
Vol 08 (02) ◽  
pp. 159-166 ◽  
Author(s):  
HONG CHEN ◽  
JIANJUN YANG
Keyword(s):  
Quark Model ◽  
Constituent Quark ◽  
Energy Levels ◽  
Constituent Quark Model ◽  
Meson Exchange ◽  
Chiral Quark Model ◽  
Baryon Spectrum ◽  
Light Baryon

The contribution due to the chiral meson exchange to the energy levels of the light baryons is studied in the constituent quark model. The effects of different dynamical ingredients are discussed and the results with and without the chiral meson exchange are compared. Our calculation accommodates all confirmed states and indicates that the chiral meson exchange is indeed necessary to resolve some outstanding problems.

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