Regge Poles and Strong Absorption in Heavy-Ion andα-Nucleus Scattering

1971 ◽  
Vol 3 (3) ◽  
pp. 1104-1117 ◽  
Author(s):  
K. W. McVoy
Keyword(s):  
Heavy Ion ◽  
Strong Absorption ◽  
Nucleus Scattering ◽  
Regge Poles

scholarly journals A Study of The Alpha – Nucleus Scattering

2014 ◽  
Vol 40 (2) ◽  
pp. 249-258
Author(s):  
DR Sarker ◽  
Ain Ul Huda ◽  
SK Das ◽  
Md K Hasan ◽  
Md M Parvej ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Alpha Particles ◽  
Strong Absorption ◽  
Distribution Data ◽  
Absorption Model ◽  
Angular Range ◽  
Deformation Parameters ◽  
Nucleus Scattering ◽  
Best Fit ◽  
Collective States

Angular distribution data for the elastic scattering of 1.37 GeV alpha particles from several nuclei are analyzed in terms of the three parameter strong absorption model of Frahn and Venter. The fits are quite satisfactory over practically the entire angular range and the best fit parameters are obtained. These are used for the study of the inelastic scattering of alpha particles leading to the collective states in nuclei. A reasonably good fit is obtained without any adjustment of the parameters suggesting thereby the success of the strong absorption model. Deformation parameters are extracted for the collective states in nuclei. Asiat. Soc. Bangladesh, Sci. 40(2): 249-258, December 2014

Quadronium and quantum electrodynamics

1996 ◽  
Vol 74 (7-8) ◽  
pp. 527-533 ◽  
Author(s):  
James J. Griffin
Keyword(s):  
Quantum Electrodynamics ◽  
Composite Particle ◽  
Bound State ◽  
Heavy Ion ◽  
Annihilation Rate ◽  
Small Correction ◽  
Order Matrix Element ◽  
Nucleus Scattering ◽  
Electron Magnetic Moment ◽  
Rule Out

The composite-particle scenario is a phenomenology that can organize the data of the "sharp lepton problem" posed by heavy-ion and (β+ + atom) studies. It hypothesizes a new composite particle (of mass ~3mc2) as the source of the observed sharp energy (e+e−) decay pairs. Available data rule out the possibilities that the source is a new elementary particle or that it is a quasi-bound state of (e+e−). Occam's razor therefore currently favors the quadronium structure, Q0 = (e+e+e−e−). Implications of quadronium for high-precision quantum electrodynamics (QED) are considered, and calculated and (or) measured deviations in QED that are sensitive to the existence of Q0 are identified. In particular, for the electron magnetic-moment anomaly, a(e) = (ge − 2)/2, a Q0–pole effects a small correction to the contributions of O(α4), which is therefore small compared to the largest current (theoretical) uncertainty. For photon–photon scattering, Q0 corrects the leading order matrix element, and allows resonant Q0 creation in photon–nucleus scattering. Finally, a Q0 bound state corrects the O(α) correction to the leading 3γ annihilation rate of triplet positronium. Therefore Q0 may contribute significantly to this decay rate, which is currently in a 10σ discrepancy with experiment. A current experimental gap is the lack of corroborative data on the sharp (Γ ≤ 2.1 keV) 330.1 keV electrons reported by Sakai from irradiations of U and Th with β+-decay positrons. A study of these (and (or) their expected partner positrons of the same energy) in collisions of (~3 MeV) beam positrons (or electrons) upon high-Z neutral atoms could fill this gap. Similar studies with positrons of 660–795 keV would test the expectation that recoilless resonance creation of the Q0 source of these pairs is also possible.

STRONG ABSORPTION MODEL STUDIES OF PION-NUCLEUS SCATTERING AROUND THE Δ RESONANCE

2004 ◽  
Vol 13 (02) ◽  
pp. 505-527 ◽  
Author(s):  
DIPIKA RANI SARKER ◽  
L. BEGUM ◽  
MD. A. RAHMAN ◽  
H. M. SEN GUPTA
Keyword(s):  
Angular Distribution ◽  
Elastic Scattering ◽  
Inelastic Scattering ◽  
Strong Absorption ◽  
Distribution Data ◽  
Absorption Model ◽  
Model Studies ◽  
Deformation Parameters ◽  
Nucleus Scattering

Angular distribution data on the elastic scattering of pions are studied on several nuclei around the Δ resonance in terms of the three-parameter strong absorption model of Frahn and Venter. The parameters thus obtained are used in the analyses of inelastic scattering of pions leading to the lowest as well as higher lying 2+ and 3- states, and the corresponding deformation parameters are extracted.

scholarly journals Heavy ion nucleus scattering

1999 ◽  
Vol 112 (6) ◽  
pp. 587-596 ◽  
Author(s):  
A. Rahman ◽  
Sirajum Munir ◽  
H. M. Sen Gupta
Keyword(s):  
Heavy Ion ◽  
Nucleus Scattering

Strong absorption model for pion-nucleus scattering around the (3,3) resonance

1991 ◽  
Vol 44 (6) ◽  
pp. 2484-2492 ◽  
Author(s):  
Md. A. Rahman ◽  
H. M. Sen Gupta ◽  
M. Rahman
Keyword(s):  
Strong Absorption ◽  
Absorption Model ◽  
Nucleus Scattering

scholarly journals HIGH-ENERGY APPROXIMATION FOR NUCLEUS–NUCLEUS SCATTERING

2001 ◽  
Vol 10 (03) ◽  
pp. 169-183 ◽  
Author(s):  
V. K. LUKYANOV ◽  
E. V. ZEMLYANAYA
Keyword(s):  
Heavy Ion ◽  
High Energy ◽  
Ion Scattering ◽  
Heavy Ion Scattering ◽  
Energy Approximation ◽  
Nucleus Scattering ◽  
Type Potential ◽  
Comparison With Experimental Data ◽  
Straight Trajectory

The high-energy approximation is adapted for heavy ion scattering at energies of several dozen MeV/nucleon. It is shown that the closed form of the eikonal phase suggested for the realistic Woods–Saxon type potential is a hopeful one for further applications. The Glauber–Sitenko small angle approach is analyzed, and a role of the Coulomb deviation of the straight trajectory of motion is investigated. Methodical calculations and comparison with experimental data are made.

Heavy-ion potentials derived from strong-absorption-model parametrizations of the scattering function

1991 ◽  
Vol 44 (4) ◽  
pp. 1606-1610 ◽  
Author(s):  
L. J. Allen ◽  
H. Fiedeldey ◽  
S. A. Sofianos ◽  
K. Amos ◽  
C. Steward
Keyword(s):  
Heavy Ion ◽  
Strong Absorption ◽  
Absorption Model ◽  
Scattering Function

EVIDENCE AGAINST A HYPOTHETICAL LIGHT SCALAR PARTICLE PRODUCED IN HEAVY ION COLLISION SYSTEMS

1986 ◽  
Vol 01 (03) ◽  
pp. 157-160 ◽  
Author(s):  
U.E. SCHRÖDER
Keyword(s):  
Experimental Data ◽  
Scalar Particle ◽  
Heavy Ion ◽  
Low Energy ◽  
Heavy Ion Collision ◽  
Energy Neutron ◽  
Light Scalar ◽  
Nucleus Scattering ◽  
Ion Collision

The existence of a hypothetical light scalar particle with conventional coupling to hadrons that has been suggested in order to explain the positron lines observed in super-heavy collision systems is shown to be in violent contradiction with experimental data obtained in low energy neutron-nucleus scattering.

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