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Title: Adiabatic-nuclei calculations of positron scattering from molecular hydrogen

The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H 2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational excitation, total ionization, and the grand total cross section. The present adiabatic-nuclei positron- H 2 scattering length is calculated as A = $-$ 2.70 a 0 for the ground state and A = $-$ 3.16 a 0 for the first vibrationally excited state. The present elastic differential cross sections are also used to “correct” the low-energy grand total cross-section measurements of the Trento group [A. Zecca et al., Phys. Rev. A 80, 032702 (2009)] for the forward-angle-scattering effect. In general, the comparison with experiment is good. In conclusion, by performing convergence studies, we estimate that our R m = 1.448 a 0 fixed-nuclei results are converged to within ± 5 % for the major scattering integrated cross sections.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Curtin Univ., Perth, WA (Australia). Curtin Inst. for Computation and Dept. of Physics
  2. Curtin Univ., Perth, WA (Australia). Curtin Inst. for Computation and Dept. of Physics
  3. Tokyo Univ. of Science, Chiba (Japan). Dept. of Physics
  4. Univ. of Trento (Italy). Dept. of Physics
  5. Flinders Univ., Adelaide, SA (Australia). School of Chemical and Physical Sciences
Publication Date:
Report Number(s):
LA-UR-16-28299
Journal ID: ISSN 2469-9926; TRN: US1700883
Grant/Contract Number:
AC52-06NA25396; DEAC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); United States Air Force Office of Scientific Research; Australian Government
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1352420
Alternate Identifier(s):
OSTI ID: 1342806

Zammit, Mark Christian, Fursa, Dmitry V., Savage, Jeremy S., Bray, Igor, Chiari, Luca, Zecca, Antonio, and Brunger, Michael J.. Adiabatic-nuclei calculations of positron scattering from molecular hydrogen. United States: N. p., Web. doi:10.1103/PhysRevA.95.022707.
Zammit, Mark Christian, Fursa, Dmitry V., Savage, Jeremy S., Bray, Igor, Chiari, Luca, Zecca, Antonio, & Brunger, Michael J.. Adiabatic-nuclei calculations of positron scattering from molecular hydrogen. United States. doi:10.1103/PhysRevA.95.022707.
Zammit, Mark Christian, Fursa, Dmitry V., Savage, Jeremy S., Bray, Igor, Chiari, Luca, Zecca, Antonio, and Brunger, Michael J.. 2017. "Adiabatic-nuclei calculations of positron scattering from molecular hydrogen". United States. doi:10.1103/PhysRevA.95.022707. https://www.osti.gov/servlets/purl/1352420.
@article{osti_1352420,
title = {Adiabatic-nuclei calculations of positron scattering from molecular hydrogen},
author = {Zammit, Mark Christian and Fursa, Dmitry V. and Savage, Jeremy S. and Bray, Igor and Chiari, Luca and Zecca, Antonio and Brunger, Michael J.},
abstractNote = {The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational excitation, total ionization, and the grand total cross section. The present adiabatic-nuclei positron- H2 scattering length is calculated as A = $-$ 2.70 a0 for the ground state and A = $-$ 3.16 a0 for the first vibrationally excited state. The present elastic differential cross sections are also used to “correct” the low-energy grand total cross-section measurements of the Trento group [A. Zecca et al., Phys. Rev. A 80, 032702 (2009)] for the forward-angle-scattering effect. In general, the comparison with experiment is good. In conclusion, by performing convergence studies, we estimate that our Rm = 1.448 a0 fixed-nuclei results are converged to within ± 5 % for the major scattering integrated cross sections.},
doi = {10.1103/PhysRevA.95.022707},
journal = {Physical Review A},
number = 2,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}