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.

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.

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.

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.

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

State-to-state charge exchange cross sections in high-velocity asymmetric and near-symmetric collisions of 400 MeV Fe26+ions

1983 ◽  
Vol 16 (21) ◽  
pp. 3993-4003 ◽  
Author(s):  
A Chetioui ◽  
K Wohrer ◽  
J P Rozet ◽  
A Jolly ◽  
C Stephan ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
High Velocity ◽  
State Charge

Partial charge exchange and excitation cross sections for C3+ + H collisions

1991 ◽  
Vol 21 (S1) ◽  
pp. S245-S246
Author(s):  
L. F. Errea ◽  
B. Herrero ◽  
L. M�ndez ◽  
O. M� ◽  
A. Riera
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Partial Charge ◽  
Excitation Cross Sections

scholarly journals Absolute cross sections for the dissociation of hydrogen cluster ions in high-energy collisions with helium atoms

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
S. Eden ◽  
J. Tabet ◽  
K. Samraoui ◽  
S. Louc ◽  
B. Farizon ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Cluster Ions ◽  
Helium Atoms ◽  
High Energy Collisions
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