Radiative Pion Capture in Flight and Charged Pion Photoproduction in Nuclei

1974 ◽  
Vol 52 (15) ◽  
pp. 1405-1415 ◽  
Author(s):  
F. Cannata ◽  
B. A. Lamers ◽  
C. W. Lucas ◽  
A. Nagl ◽  
H. Überall ◽  
...  
Keyword(s):  
Cross Sections ◽  
Charged Pion ◽  
Giant Resonance ◽  
Forward Direction ◽  
Bound State ◽  
Pion Photoproduction ◽  
Pion Absorption ◽  
Pion Energy ◽  
Photo Production ◽  
Pion Capture

Differential and total cross sections are calculated for charged pion photoproduction and radiative pion capture in flight close to threshold [Formula: see text], mainly for a target of 12C. At the lower energies, selective bound state excitation may be studied in photo-production since the giant resonance is kinematically suppressed here. Pion absorption is found to increase considerably with decreasing pion energy due to a 1/νπ factor, and it shows a dip in the forward direction except for the 1+ state. Distortion and absorption effects on the pion are calculated, and are estimated to lead to only a small reduction of the cross section in the energy region considered.

Threshold charged-pion photoproduction and radiative pion capture. II.π−d→γnn

1977 ◽  
Vol 16 (1) ◽  
pp. 327-332 ◽  
Author(s):  
W. R. Gibbs ◽  
B. F. Gibson ◽  
G. J. Stephenson
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction ◽  
Pion Capture

Threshold charged-pion photoproduction and radiative pion capture. I. The Nucleon

1977 ◽  
Vol 16 (1) ◽  
pp. 322-326 ◽  
Author(s):  
W. R. Gibbs ◽  
B. F. Gibson ◽  
G. J. Stephenson
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction ◽  
Pion Capture

Erratum: Threshold charged-pion photoproduction and radiative pion capture. II.π−d→γnn

1978 ◽  
Vol 17 (2) ◽  
pp. 856-856 ◽  
Author(s):  
W. R. Gibbs ◽  
B. F. Gibson ◽  
G. J. Stephenson
Keyword(s):  
Charged Pion ◽  
Pion Photoproduction ◽  
Pion Capture

PION ABSORPTION IN A SINGLE STEP ON THREE NUCLEONS IN He3 AND He4: A POSSIBLE SIGNAL FOR QUARK DEGREES OF FREEDOM IN NUCLEI

1990 ◽  
Vol 05 (02) ◽  
pp. 107-113 ◽  
Author(s):  
SAUL BARSHAY
Keyword(s):  
Cross Sections ◽  
Degrees Of Freedom ◽  
Single Step ◽  
Small Probability ◽  
Step Process ◽  
Pion Absorption ◽  
Pion Energy

We discuss a new mechanism by which pions are absorbed in a single-step process on three correlated nucleons in 3He and 4He, leading to three nucleons which share the pion energy comparably. The mechanism invokes quark degrees of freedom in nuclei, with a small probability of about 6% in He, but nevertheless leads to cross-sections of several millibarns. Comparison is made to recent experiments, and to conventional mechanisms.

Total and differential cross sections for pion production via coherent isobar and giant resonance formation in heavy-ion collisions

1985 ◽  
Vol 63 (9) ◽  
pp. 1242-1248 ◽  
Author(s):  
P. A. Deutchman ◽  
J. W. Norbury ◽  
L. W. Townsend
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Pion Production ◽  
Giant Resonance ◽  
Heavy Ion ◽  
Differential Cross Sections ◽  
Many Body ◽  
Peripheral Collision ◽  
Ion Collisions ◽  
Pion Energy

A quantal many-body formalism is presented that investigates pion production through the coherent formation of a nucleonic isobar in the projectile and its subsequent decay to various pion charge states along with concomitant excitation of the target to a coherent spin–isospin giant resonance via a peripheral collision of relativistic heavy ions. Total cross sections as a function of the incident energy per nucleon and Lorentz-invariant differential cross sections as a function of pion energy and angle are calculated. It is shown that the pion angular distributions, in coincidence with the target giant resonance excitations, might provide a well-defined signature for these coherent processes.

Effect of Woods-Saxon Wave Functions on Cross Sections for Charged-Pion Photoproduction fromO16

1973 ◽  
Vol 7 (5) ◽  
pp. 1785-1791 ◽  
Author(s):  
K. Srinivasa Rao
Keyword(s):  
Cross Sections ◽  
Charged Pion ◽  
Pion Photoproduction ◽  
Wave Functions

scholarly journals LEvEL: Low-Energy Neutrino Experiment at the LHC

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Kevin J. Kelly ◽  
Pedro A. N. Machado ◽  
Alberto Marchionni ◽  
Yuber F. Perez-Gonzalez
Keyword(s):  
Cross Sections ◽  
Hadron Collider ◽  
Neutrino Flux ◽  
Coherent Scattering ◽  
Forward Direction ◽  
Low Energy ◽  
Neutrino Experiment ◽  
Beam Dump ◽  
Neutrino Production ◽  
Energy Neutrino

Abstract We propose the operation of LEvEL, the Low-Energy Neutrino Experiment at the LHC, a neutrino detector near the Large Hadron Collider Beam Dump. Such a detector is capable of exploring an intense, low-energy neutrino flux and can measure neutrino cross sections that have previously never been observed. These cross sections can inform other future neutrino experiments, such as those aiming to observe neutrinos from supernovae, allowing such measurements to accomplish their fundamental physics goals. We perform detailed simulations to determine neutrino production at the LHC beam dump, as well as neutron and muon backgrounds. Measurements at a few to ten percent precision of neutrino-argon charged current and neutrino-nucleus coherent scattering cross sections are attainable with 100 ton-year and 1 ton-year exposures at LEvEL, respectively, concurrent with the operation of the High Luminosity LHC. We also estimate signal and backgrounds for an experiment exploiting the forward direction of the LHC beam dump, which could measure neutrinos above 100 GeV.

ANALYSIS OF THE ATOMIC Fe3d AND 4s PARTIAL CROSS SECTIONS IN THE REGION OF THE 3p → 3d GIANT RESONANCE

2002 ◽  
Vol 09 (02) ◽  
pp. 1229-1233 ◽  
Author(s):  
S. B. WHITFIELD ◽  
R. WEHLITZ ◽  
M. O. KRAUSE ◽  
C. D. CALDWELL
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Cross Sections ◽  
Systematic Study ◽  
Giant Resonance ◽  
Fitting Procedure

Using the technique of photoelectron spectrometry in conjunction with synchrotron radiation, we have carried out a systematic study of the partial cross sections of the main photoelectron lines arising from the ionization of the 3d and 4s subshells of atomic Fe in the vicinity of 3p → 3d autoionizing resonances. Our results confirm the presence of two broad and intense resonances which have been observed earlier. However, our high resolution results also clearly indicate the presence of numerous other weaker resonances. Through a fitting procedure we were able to accurately determine both resonance widths and positions.

THRESHOLD NEUTRAL PION PHOTOPRODUCTION ON THE PROTON AND THE CLOUDY BAG MODEL

1994 ◽  
Vol 09 (05) ◽  
pp. 399-409 ◽  
Author(s):  
A.N. TABACHENKO
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Electric Dipole ◽  
Neutral Pion ◽  
Chiral Symmetry Breaking ◽  
Additional Term ◽  
Pion Photoproduction ◽  
Differential Cross Sections ◽  
Neutral Pions ◽  
K Matrix

The energy dependence of the electric dipole amplitude, the total and differential cross-sections of the photoproduction of neutral pions off protons near threshold is given. The amplitude of process is a sum of the LET prediction and the additional term connected with the chiral symmetry breaking interaction. The simple K-matrix calculations are used to estimate the change in the electric dipole amplitude and the total and differential cross-sections between π0p and π+n thresholds.

About the effect of a bound state on ionization cross sections in ion-atom collisions

1978 ◽  
Vol 64 (4) ◽  
pp. 384-386 ◽  
Author(s):  
I.M. Kruglova ◽  
V.S. Nikolaev ◽  
V.A. Sergeev
Keyword(s):  
Cross Sections ◽  
Bound State ◽  
Ionization Cross ◽  
Ionization Cross Sections
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