scholarly journals Measurement of the free neutron-proton analyzing power and spin transfer parameters in the charge exchange region at 790 MeV

1981 ◽  
Author(s):  
R.D. Ransome
Keyword(s):  
Charge Exchange ◽  
Spin Transfer ◽  
Free Neutron ◽  
Transfer Parameters ◽  
Analyzing Power

The effect of core electrons on the spin transfer parameters

1982 ◽  
Vol 60 (5) ◽  
pp. 636-639 ◽  
Author(s):  
M. E. Ziaei
Keyword(s):  
Hyperfine Interaction ◽  
Electron Distribution ◽  
Spin Transfer ◽  
Unpaired Spin ◽  
Core Electrons ◽  
Transfer Parameters

ENDOR measurements and covalency arguments have been used to investigate the electron distribution in CsCdF3 crystals containing Mn2+ and Ni2+. The bond structure is of the form M—F−—Cd2+ (M = Mn2+ or Ni2+) and the measured isotropic supertransferred hyperfine interaction (sthfi) at the Cd site is related to the unpaired spin fraction fσ in the 2pσ orbital of F− by three different theoretical approximations. In these three methods it is assumed that [Formula: see text] orbital of the 3d ion, and the 2pz orbital of the F− ion make eovalent bonds with the (4s), (3s,4s,5s), and (1s,2s,3s,4s,5s) sets of orbitals of the Cd2+ ion respectively. The results show that cadmium core s electrons make important contributions to the isotropic sthfi. However, it seems that fσ values obtained are fairly insensitive to the approximations used.

Measurement of the () inclusive spin transfer parameters K0nn0C and K0k″k0C on carbon with 590 MeV protons

1989 ◽  
Vol 231 (3) ◽  
pp. 323-327 ◽  
Author(s):  
R. Binz ◽  
R. Büchle ◽  
M. Daum ◽  
J. Franz ◽  
G. Gaillard ◽  
...  
Keyword(s):  
Spin Transfer ◽  
Transfer Parameters ◽  
Mev Protons

Estimation of spin transfer parameters through the anisotropic supertransferred hyperfine interaction

1985 ◽  
Vol 63 (5) ◽  
pp. 557-559
Author(s):  
M. E. Ziaei
Keyword(s):  
Hyperfine Interaction ◽  
Neutron Scattering ◽  
Configuration Interaction ◽  
Reasonable Agreement ◽  
Hyperfine Interactions ◽  
Interaction Model ◽  
Covalent Bonding ◽  
Spin Transfer ◽  
Scattering Data ◽  
Transfer Parameters

Using the experimental transferred and anisotropic supertransferred hyperfine interactions, with the configuration interaction model of covalent bonding for the linear bonds of M2+(3dσ)–F−(2pσ)–Cd2+(4pσ) and M2+(3dπ)–F−(2pπ)–Cd2+(4pπ) existing in crystals of CsCdF3: M2+ (where M = Mn or Ni), suggests that fσ, the σ-type spin transfer parameter for the Mn2+–F− bond, is about 3.1%. This value is much larger than estimates from neutron scattering data, although it is in reasonable agreement with the works of Ziaei and Owen, and Rinneberg and Shirley.

General solution of the spin Hamiltonian for complex electron nuclear double resonance spectra

1981 ◽  
Vol 59 (2) ◽  
pp. 298-304 ◽  
Author(s):  
M. E. Ziaei
Keyword(s):  
Double Resonance ◽  
Spin Transfer ◽  
Nearest Neighbour ◽  
Spin Hamiltonian ◽  
Electron Nuclear Double Resonance ◽  
Order Of Magnitude ◽  
Transfer Parameters ◽  
Fluorine Ions ◽  
Host Lattices ◽  
The Magnetic Field

An electron nuclear double resonance investigation of CsCdF3:M (M = Mn2+, Ni2+, Cr3+, and Co2+) has been carried out to measure the transferred hyperfine interaction (thfi) between M and nearest neighbour fluorine ions. A general spin Hamiltonian which takes account of the multiplicity of the interacting nuclei, is solved for a general orientation of the magnetic field. An example is given to show that theory agrees well with experiment. Spin transfer parameters obtained are of similar order of magnitude for the same ions in similar host lattices.

π−p charge-exchange analyzing power from 547 to 687 MeV/c

1988 ◽  
Vol 38 (11) ◽  
pp. 3365-3374 ◽  
Author(s):  
J. A. Wightman ◽  
A. D. Eichon ◽  
G. J. Kim ◽  
A. Mokhtari ◽  
B. M. K. Nefkens ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Analyzing Power

Measurement of the free neutron-proton analyzing power from 300 to 800 MeV

1981 ◽  
Author(s):  
C. R. Newsom ◽  
C. L. Hollas ◽  
R. D. Ransome ◽  
P. J. Riley ◽  
B. E. Bonner ◽  
...  
Keyword(s):  
Free Neutron ◽  
Analyzing Power

scholarly journals Measurement of the analyzing power of the charge-exchange reaction in the momentum range 546-875 MeV/c at LEAR

1991 ◽  
Vol 273 (4) ◽  
pp. 533-539 ◽  
Author(s):  
R. Birsa ◽  
F. Bradamante ◽  
A. Bressan ◽  
S. Dalla Torre-Colautti ◽  
M. Giorgi ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Charge Exchange ◽  
Momentum Range ◽  
Charge Exchange Reaction ◽  
Analyzing Power

First H+ Charge-Exchange Images in the Stim.

1976 ◽  
Vol 34 ◽  
pp. 504-505
Author(s):  
Wm. H. Escovitz ◽  
T. R. Fox ◽  
R. Levi-Setti
Keyword(s):  
Charge Exchange ◽  
Neutral Component ◽  
Channel Electron Multiplier ◽  
Electron Multiplier ◽  
Neutral Particles ◽  
Charged Beam ◽  
Scanning Transmission ◽  
Contrast Mechanism ◽  
Ion Microscopy ◽  
Beam Component

Charge exchange, the neutralization of ions by electron capture as the ions traverse matter, is a well-known phenomenon of atomic physics which is relevant to ion microscopy. In conventional transmission ion microscopes, the neutral component of the beam after it emerges from the specimen cannot be focused. The scanning transmission ion microscope (STIM) enables the detection of this signal to make images. Experiments with a low-resolution 55 kV STIM indicate that the charge-exchange signal provides a new contrast mechanism to detect extremely small amounts of matter. In an early version of charge-exchange detection (fig. 1), a permanent magnet installed between the specimen and the detector (a channel electron multiplier) sweeps the charged beam component away from the detector and allows only the neutrals to reach it. When the magnet is removed, both charged and neutral particles reach the detector.

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