Ratio of helium double-to-single ionization with 100 MeV/u C{sup 5+} and C{sup 6+} projectiles
- Western Michigan Univ., Kalamazoo, MI (United States)
The single and double ionization of He was examined with 100 MeV/u C{sup 5+} and C{sup 6+} ions produced in the K1200 Cyclotron at Michigan State University. The He{sup +} and He{sup 2+} ions were recorded in coincidence with the outgoing charge-state selected projectiles using a time-of-flight recoil-ion detection. Special care was taken to assure single collision conditions and to correct for random background events. The ratio of double-to-single ionization for C{sup 6+} projectiles was found to be (0.24{plus_minus}0.05)%, in good agreement with the theoretical asymptotic limit of 0.26% for charged particle impact and previous measurements with high energy Ne{sup 10+} ions. In the case of C{sup 5+} projectiles there are two reaction channels, direct ionization (the outgoing projectile is C{sup 5+}) and ionization of He accompanied by electron loss from the projectile (the outgoing projectile is C{sup 6+}). For single ionization of He the ratio of the cross sections for these two processes was found to be 1.52 {plus_minus} 0.03 whereas for double ionization the ratio is 1.11{plus_minus}0.24. The ratio of outgoing charge was found to be (0.25{plus_minus}0.05)%, whereas in the case of accompanying electron loss from the projectile this ratio is (0.33{plus_minus}0.07)%.
- OSTI ID:
- 394110
- Report Number(s):
- CONF-9605105--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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