scholarly journals A STUDY OF THE πN SCATTERING DATA WITH JP = 3/2- AND A PROOF OF THE EXISTENCE OF THE N*(1700)

2014 ◽  
Vol 26 ◽  
pp. 1460061
Author(s):  
E. J. GARZON ◽  
JUJUN XIE ◽  
E. OSET
Keyword(s):  
Experimental Data ◽  
Complex Plane ◽  
Scattering Data ◽  
S Wave ◽  
Wave Data ◽  
Coupled Channels ◽  
Free Parameters ◽  
Coupled Channel ◽  
D Wave

Using an interaction extracted from the local hidden gauge Lagrangians and the coupled channels ρN (s-wave), πN (d-wave), πΔ (s-wave) and πΔ (d-wave), we look in the region of [Formula: see text] and we find two resonances dynamically generated which are naturally associated to the N*(1520)(3/2-) and N*(1700)(3/2-). The N*(1700)(3/2-) appears neatly as a pole in the complex plane. The free parameters of the theory are chosen to fit the πN (d-wave) data. The unitary coupled channel approach followed here, in connection with the experimental data, leads automatically to a pole in the 1700 MeV region and makes this second 3/2- resonance unavoidable.

scholarly journals COUPLED CHANNEL EFFECTS IN ππ S-WAVE INTERACTION

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1905-1909 ◽  
Author(s):  
F. Q. WU ◽  
B. S. ZOU
Keyword(s):  
Wave Scattering ◽  
Wave Interaction ◽  
Matrix Formalism ◽  
S Wave ◽  
Coupled Channels ◽  
Channel Effects ◽  
Scattering Phase ◽  
Scattering Phase Shifts ◽  
Coupled Channel ◽  
K Matrix

We study coupled channel effects upon isospin I=2 and I=0 ππ S-wave interaction. With introduction of the ππ→ρρ→ππ coupled channel box diagram contribution into ππ amplitude in addition to ρ and f2(1270) exchange, we reproduce the ππ I =2 S-wave and D-wave scattering phase shifts and inelasticities up to 2 GeV quite well in a K-matrix formalism. For I=0 case, the same ππ→ρρ→ππ box diagram is found to give the largest contribution for the inelasticity among all possible coupled channels including ππ→ωω→ππ, [Formula: see text]. We also show why the broad σ appears narrower in production processes than in ππ scattering process.

scholarly journals The KN Interaction in Higher Partial Waves

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1434
Author(s):  
Albert Feijoo ◽  
Daniel Gazda ◽  
Volodymyr Magas ◽  
Àngels Ramos
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Interaction Model ◽  
Theoretical Models ◽  
Reaction Cross ◽  
Chiral Expansion ◽  
Scattering Data ◽  
Model Parameters ◽  
Partial Waves ◽  
Coupled Channels

We present a chiral K¯N interaction model that has been developed and optimized in order to account for the experimental data of inelastic K¯N reaction channels that open at higher energies. In particular, we study the effect of the higher partial waves, which originate directly from the chiral Lagrangian, as they could supersede the role of high-spin resonances employed in earlier phenomenological models to describe meson-baryon cross sections in the 2 GeV region. We present a detailed derivation of the partial wave amplitudes that emerge from the chiral SU(3) meson-baryon Lagrangian up to the d-waves and next-to-leading order in the chiral expansion. We implement a nonperturbative unitarization in coupled channels and optimize the model parameters to a large pool of experimental data in the relevant energy range where these new contributions are expected to be important. The obtained results are encouraging. They indicate the ability of the chiral higher partial waves to extend the description of the scattering data to higher energies and to account for structures in the reaction cross-sections that cannot be accommodated by theoretical models limited to the s-waves.

Peculiarities of 6Li +12C elastic scattering

2019 ◽  
Vol 28 (12) ◽  
pp. 1950108 ◽  
Author(s):  
Sh. Hamada ◽  
Awad A. Ibraheem
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Cluster Structure ◽  
Scattering Data ◽  
The Real ◽  
State Formula ◽  
Nuclear Interference ◽  
Double Folding ◽  
Coupled Channel ◽  
Bombarding Energy

Using the phenomenological optical potential and two different semi-microscopic potentials, namely double folding and cluster folding (CF), the available experimental data for 6Li elastically scattered from [Formula: see text]C nucleus at energies 50–600[Formula: see text]MeV are reanalyzed. On the basis of the well-known cluster structure of 6Li as a composite nucleus consisting of a core “alpha” with a valence particle “deuteron” orbiting this core, special attention was paid to the CF potential. Elastic scattering data for 6Li+[Formula: see text]C system plotted as a function of momentum transfer showed that the real Coulomb nuclear interference region is independent of the bombarding energy. The aforementioned structural behavior for the data could be used to define the potential with some certainty. In addition to a Woods–Saxon imaginary potential of fixed radius, the real part of the potential derived from the cluster structure of 6Li was successful in reproducing the experimental data in the whole angular range. Coupled channel (CC) calculation effects are also performed by coupling to 6Li resonant state ([Formula: see text], [Formula: see text][Formula: see text]MeV).

scholarly journals CHIRAL UNITARY APPROACH TO HADRON SPECTROSCOPY

2003 ◽  
Vol 18 (03) ◽  
pp. 387-396 ◽  
Author(s):  
E. Oset ◽  
T. Inoue ◽  
M. J. Vicente Vacas ◽  
A. Ramos ◽  
C. Bennhold
Keyword(s):  
Complex Plane ◽  
Final States ◽  
S Wave ◽  
Baryon Interaction ◽  
Hadron Spectroscopy ◽  
Dynamical Generation ◽  
Coupled Channels ◽  
Unitary Approach ◽  
Chiral Unitary Approach ◽  
Chiral Lagrangian

The s-wave meson-baryon interaction in the S = -1, S = 0 and S = -2 sectors is studied by means of coupled channels, using the lowest-order chiral Lagrangian and the N/D method or equivalently the Bethe-Salpeter equation to implement unitarity. This chiral approach leads to the dynamical generation of the Λ(1405), Λ(1670) and Σ(1620) states for S = -1, the N*(1535) for S = 0 and the Ξ(1620) for S = -2. We look for poles in the complex plane and extract the couplings of the resonances to the different final states. This allows identifying the Λ(1405) and the Λ(1670) resonances with [Formula: see text] and K Ξ quasibound states, respectively. Our results are found to be incompatible with the measured properties of the Ξ(1690) resonance, thus ruling this state out as the remaining member of this octet of dynamically generated resonances. We therefore assign 1/2- for the spin and parity of the Ξ(1620) resonance as the S = -2 member of the lowest-lying 1/2- octet.

S11 RESONANCES IN A COUPLED-CHANNEL DYNAMICAL MODEL

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1656-1661 ◽  
Author(s):  
SHIN NAN YANG ◽  
GUAN-YEU CHEN ◽  
SABIT S. KAMALOV ◽  
L. TIATOR ◽  
D. DRECHSEL
Keyword(s):  
Pion Photoproduction ◽  
Dynamical Model ◽  
S Wave ◽  
Pion Scattering ◽  
A Value ◽  
Multipole Analysis ◽  
Coupled Channels ◽  
Self Consistent ◽  
The Masses ◽  
Coupled Channel

A self-consistent analysis of pion scattering and pion photoproduction within a coupled channels dynamical model is presented. The results indicate the existence of a third and a fourth S11 resonance with the masses 1846±47 and 2113±70 MeV . In the case of pion photoproduction, we found that background contributions to the imaginary part of the S-wave multipole become large and negative in the region of the S11(1535) resonance. Due to this fact, much larger resonance contributions are required in order to explain the results of the recent multipole analysis. For the first S11(1535) resonance we obtain a value of 72±2×10-3 GeV -1/2 for the electromagnetic helicity amplitude A1/2.

scholarly journals An investigation of the elastic scattering of 17O projectiles by different target nuclei using the CDCC method

2021 ◽  
Vol 67 (5 Sep-Oct) ◽  
pp. 1-4
Author(s):  
Şule Karatepe
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Convenient Method ◽  
Scattering Data ◽  
Interaction Potentials ◽  
Weakly Bound ◽  
Optical Potentials ◽  
Coupled Channels ◽  
The Continuum

The Continuum Discretized Coupled Channels (CDCC) method is a convenient method that was developed in order to examine weakly bound nuclei. For this purpose, the elastic scattering data of 17 O projectile for 90 Zr, 124 Sn and 208 P b target nuclei were investigated at 340 MeV using the CDCC method. In calculations using this method, 17 O projectiles were taken to be .Optical potentials were selected as the interaction potentials. It was seen that the results obtained were compatible with the experimental data. The effects of excited channels in all three systems were also determined.

scholarly journals Coupled channels calculations of fusion reactions for 46Ti+64Ni, 40Ca+194Pt and 40Ar+148Sm systems

2020 ◽  
Vol 18 (47) ◽  
pp. 84-90
Author(s):  
Hayder Jasim Musa ◽  
Fouad A. Majeed ◽  
Ali T. Mohi
Keyword(s):  
Experimental Data ◽  
Fusion Cross Section ◽  
Quantum Calculations ◽  
Fusion Reactions ◽  
Coupled Channels ◽  
Barrier Distribution ◽  
Mechanical Approach ◽  
Fusion Barrier Distribution ◽  
Quantum Mechanical Approach ◽  
Coupled Channel

In this work, the fusion cross section ,  fusion barrier distribution  and the probability of fusion  have been investigated by coupled channel method  for the systems 46Ti+64Ni, 40Ca+194Pt and 40Ar+148Sm with semi-classical and quantum mechanical approach using SCF and CCFULL Fortran codes respectively. The results for these calculations are compared with available experimental data. The results show that the quantum calculations agree better with experimental data, especially bellow the Coulomb barrier, for the studied systems while above this barrier, the two codes reproduce the data.

Fusion and Breakup Reactions of 17S + 208Pb and 15C + 232ThHalo Nuclei Systems

2015 ◽  
Vol 11 (2) ◽  
pp. 2972-2978
Author(s):  
Fouad A. Majeed ◽  
Yousif A. Abdul-Hussien
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Fusion Reaction ◽  
Fusion Cross Section ◽  
Reaction Cross ◽  
Recent Experimental Data ◽  
Barrier Distribution ◽  
Coupled Channel ◽  
Total Fusion ◽  
Full Quantum

In this study the calculations of the total fusion reaction cross section have been performed for fusion reaction systems 17F + 208Pb and 15C + 232Th which involving halo nuclei by using a semiclassical approach.The semiclassical treatment is comprising the WKB approximation to describe the relative motion between target and projectile nuclei, and Continuum Discretized Coupled Channel (CDCC) method to describe the intrinsic motion for both target and projectile nuclei. For the same of comparsion a full quantum mechanical clacualtions have been preforemd using the (CCFULL) code. Our theorticalrestuls are compared with the full quantum mechaincialcalcuations and with the recent experimental data for the total fusion reaction  checking the stability of the distancesThe coupled channel calculations of the total fusion cross section σfus, and the fusion barrier distribution Dfus. The comparsion with experiment proves that the semiclassiacl approach adopted in the present work reproduce the experimental data better that the full quantal mechanical calcautions. 

scholarly journals Mixed-state penetration depths in s-wave and d-wave superconductors

1998 ◽  
Vol 109 (4) ◽  
pp. 289-293 ◽  
Author(s):  
Yong Wang ◽  
A.H. MacDonald
Keyword(s):  
Mixed State ◽  
S Wave ◽  
Penetration Depths ◽  
D Wave

A PANORAMA OF CDCC CALCULATIONS FOR DEUTERON INDUCED REACTIONS: FROM ELASTIC CROSS SECTIONS TO INELASTIC AND TRANSFER ONES

2011 ◽  
Vol 20 (04) ◽  
pp. 953-957 ◽  
Author(s):  
P. HUU-TAI CHAU
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Deformed Nuclei ◽  
Coupled Channels ◽  
The Continuum

An overview of calculations performed within the Continuum Discretized Coupled Channels (CDCC) approach for deuteron induced reactions is given. We briefly present an extension of the CDCC formalism which accounts for the target excitations allowing us to determine ( d , d ') cross sections off deformed nuclei. We compare some calculated inelastic cross sections with experimental data. Then it is shown that the CDCC formalism can also be a useful tool to determine ( d , p ) cross sections. This point is illustrated with 54 Cr ( d , p )55 Cr reactions.

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