Electron Capture Cross Sections Into the N PDF Download

Author: Charles Arthur Stigers
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 103

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Author: Laura N. Tunnell
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 416

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Author: Edward A. Burke
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 30

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Author: Robert A. Mapleton
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 10

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The total Oppenheimer-Brinkman-Kramers (OBK) cross sections for 1s-, 2s-, and 2p-orbital electron capture from atomic nitrogen by protons are adjusted to correspond to capture from N2 by deuterons, and are compared with recent measurements of Berkner et al. Calculated cross sections for 1s capture are dominant above 3 MeV, and the total OBK cross section still exceeds the measured cross section at the deuteron energy of 21.5 MeV.

Author: R. A. Mapleton
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 22

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The first Born approximation with both the proton-proton and proton-electron interaction is used to calculate the high energy electron capture cross section. It is shown that the high energy proton-nucleus amplitude has a dominant peak for backward scattering (centre-of-mass system). As a consequence of this peak, if the protons are treated as distinguishable particles, the cross section depends upon the impact energy E as E(3- ) in contrast to the commonly accepted E(6- ) dependence. When the protons are treated as indistinguishable particles, the electron capture cross section is not defined at sufficiently high energies. This same cross section is also calculated using the distorted wave approximation as developed by Bassel and Gerjuoy in 1960. It is shown that the proton-nucleus amplitude is only cancelled in the forward direction, and consequently the electron capture cross section is again not defined at high energies. (Author).

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 41

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Author: R. A. Mapleton
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 24

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Author: N. Toshima
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ISBN:
Category : Collisional excitation
Languages : en
Pages : 50

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Author: Robert A. Mapleton
Publisher:
ISBN:
Category : Alkali metals
Languages : en
Pages : 334

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Classical and quantal nonrelativistic scattering between simple atomic systems is reviewed, and most approximations currently used in calculations on electron capture are discussed. The OBK interaction is generalized to include capture from neutral atoms by singly charged many-electron ions; the sum over the squares of the vector coupling coefficients is affected in the formula for the OBK cross section for p-orbital capture by protons into H(ns). The cross section for H(+) + H(1s) to H(Sigma n1) + H(+) at high impact energies is determined classically. The second Born amplitudes at high impact energies for H(+) + H(1s) to H(1s) + H(+) and H(+) + D(1s) to H(1s) + D(+) are evaluated approximately using the Green's function of the post Hamiltonian. Two modifications of Thomas' classical model for heavy atoms are proposed, and corresponding cross sections are calculated for H(+) + B to H(Sigma n1) + B(+) with B = O, N, Ne, A, Kr, Xe. A semiclassical theory is developed for charge transfer in alkali atom-alkali-ion collision at low impact velocities, and cross sections are obtained for H, Li, Na, K, Rb, Cs. OBK cross sections are calculated for s-orbital capture from He(1s(2)), N((4)S), O((3)P), and p-orbital capture from N((4)S), O((3)P), all for incident protons capturing into H(1s). Born prior and post cross sections are calculated for H(+) + O((3)P) to H(1s) + O(+)((4)S) and H(1s) + H(1s) to H( - )(1s(2)) + H(+).

Author: David T. Goldman
Publisher:
ISBN:
Category : Neutron cross sections
Languages : en
Pages : 730

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