scholarly journals Charge Exchange Reactions in Astrophysical Plasmas

1983 ◽  
Vol 103 ◽  
pp. 187-197
Author(s):  
R. McCarroll ◽  
P. Valiron ◽  
L. Opradolce
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Molecular Model ◽  
Recent Experimental Data ◽  
Exchange Reactions ◽  
Astrophysical Plasmas ◽  
Atomic Collisions ◽  
Physical Conditions ◽  
Theoretical Approaches ◽  
Basic Features

A review is presented of charge exchange reactions of multiply charged ions with atomic hydrogen and helium at thermal-eV energies, typical of the physical conditions encountered in planetary nebulae. The basic features of the processes are analyzed in the framework of the molecular model of atomic collisions. A discussion is given of the different theoretical approaches to the calculation of the collision cross sections. A comparison with recent experimental data is included.

Charge exchange reactions on medium and heavy mass targets at intermediate energies

2019 ◽  
Vol 35 (08) ◽  
pp. 2050045
Author(s):  
Pardeep Singh ◽  
Monika Singh ◽  
Neha Rani
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Energy Charge ◽  
Impulse Approximation ◽  
Mass Region ◽  
Intermediate Energy ◽  
Exchange Reactions ◽  
Plane Wave Impulse Approximation ◽  
Text Type ◽  
Intermediate Energies

The nuclear isotopic structure can be understood easily via the intermediate-energy charge exchange reactions of (p, n) and [Formula: see text]He, [Formula: see text] type. In the current contribution, we present some results for charge exchange reactions induced by 3He on targets lying in mass region [Formula: see text] within the theoretical framework of plane wave impulse approximation (PWIA) and distorted wave impulse approximation (DWIA). Here, the recoil effects in PWIA have also been considered. Particularly, the angular distributions and the unit cross-sections have been calculated and compared with the available data. Further, the importance of inclusion of the exchange contribution in these reactions is also considered, which eventually enhance the matching with data.

Charge Exchange Reactions in Astrophysical Plasmas

1983 ◽  
pp. 187-197
Author(s):  
R. McCarroll ◽  
P. Valiron ◽  
L. Opradolce
Keyword(s):  
Charge Exchange ◽  
Exchange Reactions ◽  
Astrophysical Plasmas

scholarly journals Charge Exchange Cross Sections for Noble Gas Ions and N2 between 0.2 and 5.0 keV

Atoms ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 96
Author(s):  
Steven Bromley ◽  
Corey Ahl ◽  
Chad Sosolik ◽  
Joan Marler
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Neutral Atom ◽  
Mechanical Design ◽  
Noble Gas ◽  
Dominant Role ◽  
Intermediate Energy ◽  
Fundamental Interaction ◽  
Gas Cell ◽  
Astrophysical Plasmas

Charge transfer of an electron from a neutral atom to an ion is a fundamental interaction that plays a dominant role in the energy balance of atmospheric and astrophysical plasmas. The present investigation measured the charge exchange cross sections of noble gas ions (He + , Ne + , Ar + , Kr + ) with N 2 in the intermediate energy range 0.2–5.0 keV. The systems were chosen because there remains a lack of consensus amongst previous measurements and regions where there were no previous measurements. A description of the mechanical design for an electrically floated gas cell is described herein.

Neutral Mass-Selected Lead Cluster Beams

1990 ◽  
Vol 206 ◽  
Author(s):  
M. Abshagen ◽  
F. Träger ◽  
J. Kowalski ◽  
M. Meyberg ◽  
G. zu Putlitz ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Materials Science ◽  
Metal Cluster ◽  
Cluster Ions ◽  
Universal Method ◽  
Exchange Reactions ◽  
Atomic Sodium ◽  
D 12 ◽  
Cluster Beams

ABSTRACTExperiments are described which illustrate that resonant neutralization of mass-selected cluster ions provides a universal method to produce neutral mass-selected metal cluster beams. Specifically, lead cluster ions, Pbn+ with n d 12, were neutralized by charge exchange reactions in atomic sodium and other target materials. Absolute charge exchange cross sections are on the order of 40 Å2 and up to 30% of the incident ions were neutralized. Possible fragmentation of the clusters associated with neutralization was investigated by translational spectroscopy. No indication of fragmentation was found for resonant electron transfer with atomic Na as target gas.. Thus, neutral metal cluster beams with ultra-narrow size distribution are produced. Deposition of such size-selected metal clusters on substrates opens new perspectives in materials science.

Recent theoretical developments in nuclear charge-exchange reactions

1987 ◽  
Vol 65 (6) ◽  
pp. 614-625 ◽  
Author(s):  
J. Wambach
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Spin Dynamics ◽  
Random Phase ◽  
Impulse Approximation ◽  
Linear Response Theory ◽  
Exchange Reactions ◽  
Intermediate Energies ◽  
Direct Reactions ◽  
P Type

The (p, n) and (n, p) charge-exchange reactions are a suitable tool in nuclear-structure studies. At intermediate energies, the interaction with the target resembles that between free nucleons, which makes the probes mostly susceptible to the spin dynamics of the nucleus. We review the current theoretical picture of nucleon–nucleus charge-exchange reactions. A brief introduction to the theory of direct reactions in the impulse approximation is given. We then discuss the random-phase approximation (RPA) linear response theory, which is widely used in the calculation of cross sections and related observables. To understand correctly the shape of the continuum cross sections, one needs a more sophisticated theory. We discuss suitable extensions of the RPA that incorporate spreading effects as well as escape effects. Charge-exchange reactions of the (n, p) type have important implications for the evolution of massive stars. The relevance for Type-II supernovae is discussed.

Charge Exchange in Laboratory and Astrophysical Plasmas

1988 ◽  
Vol 102 ◽  
pp. 153-163
Author(s):  
D. Pequignot
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Solar Spectrum ◽  
Ionization Front ◽  
Solar Chromosphere ◽  
Astrophysical Plasmas ◽  
Heavy Particles ◽  
Astrophysical Objects ◽  
Photoionized Plasmas ◽  
Ionization Balance

AbstractRecent experiments in tokamak plasmas demonstrate that charge exchanges manifest themselves in a wide variety of situations. It is now realized that charge exchanges involving excited states of hydrogen should be considered: these reactions represent a challenge for atomic physics, detailed plasma modeling, and quantitative plasma diagnostics. Charge exchanges between ions can in some cases modify the state of the gas and produce specific emission.Charge exchanges are important for the ionization balance of many ions in either warm coronal plasmas or photoionized plasmas of Astrophysics. Lines produced by charge exchange have been discovered in the spectrum of nebulae and probably the solar chromosphere. Introduction of charge exchanges modifies earlier views about the structure of some astrophysical objects. The nebulae appear as valuable “laboratories” to check theoretical charge exchange cross sections at very low energy. It is suggested that the detection of charge exchange lines in the solar spectrum would provide new insights into the dynamics of the interface between the chromosphere and the corona. It is pointed out that charge exchanges between heavy particles may have significant effects in the ionization front of some nebulae.

scholarly journals Laser Assisted Charge Exchange in Atomic Collisions

1991 ◽  
Vol 11 (3-4) ◽  
pp. 285-290 ◽  
Author(s):  
J. F. Castillo ◽  
L. F. Errea ◽  
L Méndez ◽  
A. Riera
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Cross Sections ◽  
Laser Field ◽  
Laser Wavelength ◽  
Total Charge ◽  
Atomic Collisions ◽  
Radiative Transitions ◽  
The Cross ◽  
Impact Energies

We present total charge exchange cross sections for collisions of Li(1s22s2S) with H(1s) in presence of a linear polarized laser field of intensity 0.05 ≤ I ≤ 1 TW/cm2 and wavelength 5 103 ≤ λ ≤ 14 103 Å. Our calculation shows that the laser field can increase the cross section of this reaction by a factor of ten at impact energies E < 0.1 ke V/a.m.u. The mechanism of this process is discussed and it is shown that both atomic and molecular radiative transitions can take place depending on the laser wavelength employed.

scholarly journals PION DOUBLE CHARGE EXCHANGE REACTIONS LEADING TO DOUBLE PIONIC ATOMS

1992 ◽  
Vol 07 (32) ◽  
pp. 2991-2998 ◽  
Author(s):  
J. NIEVES ◽  
E. OSET ◽  
S. HIRENZAKI ◽  
H. TOKI ◽  
M.J. VICENTE-VACAS
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Reaction Cross ◽  
Wave Functions ◽  
Exchange Reactions ◽  
Double Charge Exchange ◽  
Pionic Atom ◽  
Pionic Atoms ◽  
Double Charge ◽  
Reaction Cross Sections

We study theoretically pion double charge exchange reactions leading to double pionic atoms. The reaction cross-sections with two pions in the deeper bound pionic orbits in 208Pb are calculated with realistic pionic atom wave functions and distortion effects. The cross-sections are found to be d2σ/dEdΩ~10−3−10−4 µ b/srMeV , which are only a small fraction of the double charge exchange background.

Cross Sections for Charge-Exchange Reactions of the TypeH++H(n1l1m1)→H(n2l2m2)+H+

1965 ◽  
Vol 137 (3A) ◽  
pp. A699-A702 ◽  
Author(s):  
Robert M. May ◽  
J. G. Lodge
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Exchange Reactions
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