skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV/u

Abstract

It is well known that the density of the target can have a crucial impact on charge-changing collisions of partially ionized heavy ions. However, the basic understanding of this experimental observation is hampered by the difficulty in knowing the charge-state evolution of projectiles inside solids. Therefore, the present experiments with 200 MeV/u bare and H-like nickel ions were performed to study charge-changing cross sections in different monatomic and compound gases and solids. The experimental results clearly demonstrate that the electron-loss cross sections in solids increase by about 40% compared to gases. The results support the Bohr-Lindhard model which predicts this gas-solid difference originating from enhanced ionization of excited ions. The experimental results are compared with recent theoretical estimates.

Authors:
; ;  [1]; ; ; ;  [2];  [3];  [4];  [5]; ; ; ; ; ; ; ; ; ;  [2] more »;  [6] « less
  1. Department of Physics, Nara Women's University, Nara 630-8506 (Japan)
  2. Gesellschaft fuer Schwerionenforschung GSI, Planckstrasse 1, 64291 Darmstadt (Germany)
  3. (Germany)
  4. Institut fuer Physik, University of Kassel, Heinrich-Plett-Strasse 40, D-34132 Kassel (Germany)
  5. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
  6. P.N. Lebedev Physical Institute, Leninski prospect 53, 119991 Moscow (Russian Federation) (and others)
Publication Date:
OSTI Identifier:
20982053
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.75.020703; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CHARGE EXCHANGE; CHARGE STATES; COLLISIONS; CROSS SECTIONS; DENSITY; EXCITED STATES; GASES; HEAVY IONS; IONIZATION; MEV RANGE 100-1000; NICKEL IONS; SIMULATION; SOLIDS; SURFACES

Citation Formats

Ogawa, H., Sakamoto, N., Tsuchida, H., Geissel, H., Fettouhi, A., Knoebel, R. K., Litvinov, Yu. A., II. Physikalisches Institut, Justus-Liebig Universitaet Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen, Fritzsche, S., Portillo, M., Scheidenberger, C., Weick, H., Becker, F., Boutin, D., Kindler, B., Lommel, B., Muenzenberg, G., Stadlmann, J., Winkler, M., Yao, N., and Shevelko, V. P. Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV/u. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.020703.
Ogawa, H., Sakamoto, N., Tsuchida, H., Geissel, H., Fettouhi, A., Knoebel, R. K., Litvinov, Yu. A., II. Physikalisches Institut, Justus-Liebig Universitaet Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen, Fritzsche, S., Portillo, M., Scheidenberger, C., Weick, H., Becker, F., Boutin, D., Kindler, B., Lommel, B., Muenzenberg, G., Stadlmann, J., Winkler, M., Yao, N., & Shevelko, V. P. Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV/u. United States. doi:10.1103/PHYSREVA.75.020703.
Ogawa, H., Sakamoto, N., Tsuchida, H., Geissel, H., Fettouhi, A., Knoebel, R. K., Litvinov, Yu. A., II. Physikalisches Institut, Justus-Liebig Universitaet Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen, Fritzsche, S., Portillo, M., Scheidenberger, C., Weick, H., Becker, F., Boutin, D., Kindler, B., Lommel, B., Muenzenberg, G., Stadlmann, J., Winkler, M., Yao, N., and Shevelko, V. P. Thu . "Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV/u". United States. doi:10.1103/PHYSREVA.75.020703.
@article{osti_20982053,
title = {Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV/u},
author = {Ogawa, H. and Sakamoto, N. and Tsuchida, H. and Geissel, H. and Fettouhi, A. and Knoebel, R. K. and Litvinov, Yu. A. and II. Physikalisches Institut, Justus-Liebig Universitaet Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen and Fritzsche, S. and Portillo, M. and Scheidenberger, C. and Weick, H. and Becker, F. and Boutin, D. and Kindler, B. and Lommel, B. and Muenzenberg, G. and Stadlmann, J. and Winkler, M. and Yao, N. and Shevelko, V. P.},
abstractNote = {It is well known that the density of the target can have a crucial impact on charge-changing collisions of partially ionized heavy ions. However, the basic understanding of this experimental observation is hampered by the difficulty in knowing the charge-state evolution of projectiles inside solids. Therefore, the present experiments with 200 MeV/u bare and H-like nickel ions were performed to study charge-changing cross sections in different monatomic and compound gases and solids. The experimental results clearly demonstrate that the electron-loss cross sections in solids increase by about 40% compared to gases. The results support the Bohr-Lindhard model which predicts this gas-solid difference originating from enhanced ionization of excited ions. The experimental results are compared with recent theoretical estimates.},
doi = {10.1103/PHYSREVA.75.020703},
journal = {Physical Review. A},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • A method for solving the time-dependent two-center Dirac equation is developed. The time-dependent Dirac wave function is represented as a sum of atomiclike Dirac-Sturm orbitals, localized at the ions. The atomic orbitals are generated by solving numerically the one-center Dirac and Dirac-Sturm equations by means of a finite-difference approach with the Coulomb potential taken as the sum of the exact reference-nucleus potential and of the other nucleus within the monopole approximation. An original procedure for calculating the two-center integrals with these orbitals is proposed. As a first test of the approach developed here, calculations of the charge-transfer and ionization crossmore » sections for the H(1s)-proton collisions at proton energies from 1 to 100 keV are performed. The obtained results are compared with related experimental and other theoretical data. To investigate the role of the relativistic effects, the charge-transfer cross sections in collisions of Ne{sup 9+}(1s)-Ne{sup 10+} (at energies from 0.1 to 10 MeV/u) and U{sup 91+}(1s)-U{sup 92+} (at energies from 6 to 10 MeV/u) are calculated for both relativistic and nonrelativistic cases.« less
  • We have studied charged nuclear fragments produced by 200 - 400 MeV/nucleon carbon ions, interacting with water and polycarbonate, using a newly developed emulsion detector. Total and partial charge-changing cross sections for the production of B, Be, and Li fragments were measured and compared with both previously published measurements, and model predictions. This study is of importance for validating and improving carbon ion therapy treatment planning systems, and for estimating the radiological risks for personnel on space missions, since carbon is a significant component of the Galactic Cosmic Rays.
  • We have studied charged nuclear fragments produced by 200- to 400-MeV/nucleon carbon ions, interacting with water and polycarbonate, using a newly developed emulsion detector. Total and partial charge-changing cross sections for the production of B, Be, and Li fragments were measured and compared with both previously published measurements and model predictions. This study is of importance for validating and improving carbon-ion therapy treatment planning systems and for estimating the radiological risks for personnel on space missions, because carbon is a significant component of galactic cosmic rays.