Abstract
Positronium formation (Ps) cross sections for positrons impinging on atomic hydrogen were measured in the impact energy range from 13 to 255 eV at the High Intensity Positron (HIP) beam at Brookhaven National Laboratory (BNL). The Ps-formation cross section was found to rise rapidly from the threshold at 6.8 eV to a maximum value of (2.98±0.18) ×10−16 cm2 for ∼15 eV positrons. By 75 eV it drops below the detection limit of 0.17×10−16 cm2 which is the present level of statistical uncertainty. A more elaborate data analysis was performed leading to somewhat smaller cross sections than originally published [1]. During the course of this experiment further relative data on impact-ionization cross sections were accumulated.
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References
W. Sperber, D. Becker, K.G. Lynn, W. Raith, A. Schwab, G. Sinapius, G. Spicher and M. Weber, Phys. Rev. Lett. 68 (1992) 3690.
E.A.G. Armour, Phys. Rep. 169 (1988) 1.
M. Charlton and G. Laricchia, J. Phys. B 23 (1990) 1045.
C.J. Brown and J.W. Humberston, J. Phys. B 18 (1985) L401.
J.W. Humberston, Adv. At. Mol. Phys. 22 (1986) 1.
D. Fromme, G. Kruse, W. Raith and G. Sinapius, Phys. Rev. Lett. 57 (1986) 3031.
D. Fromme, G. Kruse, W. Raith and G. Sinapius, J. Phys. B 21 (1988) L261.
H. Knudsen, L. Brun-Nielsen, M. Charlton and M.R. Poulsen, J. Phys. B 23 (1990) 3955.
D. Madison and I. Bray, private communication ICPEACXVII, Aarhus 1993.
M. Charlton, G. Clark, T.C. Griffith and G.R. Heyland, J. Phys. B 16 (1983) L465.
L.S. Fornari, L.M. Diana and P.G. Coleman, Phys. Rev. Lett. 51 (1983) 2276.
L.M. Diana, S.C. Sharma, L.S. Fornari, P.G. Coleman, P.K. Pendleton, D.L. Brooks and B.E. Seay, in:Positron Annihilation, eds. R.M. Singru and P.C. Jain (World Scientific, Singapore, 1985) p. 428.
L.M. Diana, P.G. Coleman, D.L. Brooks, P.K. Pendleton, D.M. Norman, B.E. Seay and S.C. Sharma, in:Positron (Electron) Gas Scattering, eds. W.E. Kauppila, T.S. Stein and J.M. Wadehra (World Scientific, Singapore, 1986) p. 296.
L.M. Diana, P.G. Coleman, D.L. Brooks, P.K. Pendleton and D.M. Norman, Phys. Rev. A 34 (1986) 2731.
L.M. Diana, P.G. Coleman, D.L. Brooks and R.L. Chaplin, in:Atomic Physics with Positrons, eds. J.W. Humberston and E.A.G. Armour (Plenum Press, New York, 1987) p. 55.
D. Fromme, G. Kruse, W. Raith and G. Sinapius, J. Phys. B 21 (1988) L261.
L.M. Diana, D.L. Brooks, P.G. Coleman, R.L. Chaplin and J.P. Howell, in:Positron Annihilation, eds. L. Dorikens-Vanpraet, M. Dorikens and D. Segers (World Scientific, Singapore, 1989) p. 311.
T.S. Stein, W.E. Kauppila, C.K. Kwan, S.P. Parikh and S. Zhou, Hyp. Int. 73 (1992) 53.
C. Spicher, B. Olsson, W. Raith, G. Sinapius and W. Sperber, Phys. Rev. Lett. 64 (1989) 1019.
R.W. Bussard, R. Ramaty and R.J. Drachman, Astrophys. J. 228 (1979) 928.
M. Leventhal, C.J. MacCallum, S.D. Barthelmy, M. Gehrels, B.J. Teegarden and J. Tueller, Nature 339 (1989) 36.
R. Drachman, this Conference.
G. Gabrielse, K. Helmerson, R. Tjoelker, X. Fei, T. Trainor, W. Kells and H. Kalinowsky,Proc. 1st Workshop on Antimatter Physics at Low Energies, Fermilab (FNAL, Batavia, IL, 1986) p. 211.
B.I. Deutch, A.S. Jensen, A. Miranda and G.C. Oades, in:Proc. 1st Workshop on Antimatter Physics at Low Energies, Fermilab, (FNAL, Batavia, IL, 1986) p. 371.
B.I. Deutch, F.M. Jacobsen, L.H. Andersen, P. Hvelplund, H. Knudsen, M.H. Holzscheiter, M. Charlton and G. Laricchia, Phys. Scripta T 22 (1988) 248.
J.W. Humberston, M. Charlton, F.M. Jacobsen and B.I. Deutch, J. Phys. B 20 (1987) L25.
J. Slevin and W. Stirling, Rev. Sci. Instr. 52 (1981) 1780.
M.B. Shah, D.S. Elliot and H.B. Gilbody, J. Phys. B 20 (1987) 3501.
K.F. Canter, P.H. Lippel, W.S. Crane and A.P. Mills Jr.,Positron Studies of Solids, Surfaces, and Atoms, eds. A.P. Mills Jr., W.S. Crane and K.F. Canter (World Scientific, Singapore, 1986) p. 199.
M. Weber, A. Schwab, D. Becker and K.G. Lynn, Hyp. Int. 73 (1992) 147.
R. Khatri, M. Charlton, P. Sferlazzo, K.G. Lynn, A.P. Mills Jr. and L.O. Roellig, Appl. Phys. Lett. 57 (1990) 2374.
R. Acacia, private communication XVIIIICPEAC, Aarhus 1993.
H.S.R. Massey and C.B.O. Mohr, Proc. Roy. Soc. A 140 (1933) 613.
W. Sperber, PhD Thesis, Universität Bielefeld, Germany (January 1993).
W.L. Fite and R.T. Brackmann, Phys. Rev. 112 (1958) 1141.
O. Helene, Nucl. Instr. Meth. 228 (1984) 120.
G.O. Jones, M. Charlton, J. Slevin, G. Laricchia, A. Kövér, M.R. Poulsen and S.N. Chormaic, J. Phys. B 26 (1993) L483.
W.E. Kauppila, T.S. Stein and C.K. Kwan, private communications at the International Workshop on Positron Interactions with Atoms, Molecules and Clusters, Bielefeld 1993 and at ICPEACXVIII, Aarhus 1993.
H.R.S. Massey and C.B.O. Mohr, Proc. Phys. Soc. A 67 (1954) 695.
G. Laricchia, M. Charlton, C. Clark and T.C. Griffith, Phys. Lett. A 109 (1985) 97.
C.J. Hewitt, C.J. Noble and B.H. Bransden, J. Phys. B 23 (1990) 4185.
M.A. Abdel-Raouf, J.W. Darewych, R.P. McEachran and A.D. Stauffer, Phys. Lett. 100 A (1984) 353.
J.C. Straton, Phys. Rev. A 35 (1987) 3725.
C. Lo and M.D. Girardeau, Phys. Rev. A 41 (1990) 158.
R. Shakeshaft and J.M. Wadehra, Phys. Rev. A 22 (1980) 968.
P. Khan and A.S. Ghosh, Phys. Rev. A 27 (1983) 1904.
K. Higgins and P.G. Burke, J. Phys. B 24 (1991) L343.
A. Ohsaki, T. Watanabe, K. Nakanishi and K. Iguchi, Phys. Rev. A 32 (1985) 2640.
A.E. Wetmore and R.E. Olson, Phys. Rev. A 34 (1986) 2822.
P. Mandal, S. Guha and N.C. Sil, J. Phys. B 12 (1979) 2913.
P. Mandal and S. Guha, J. Phys. B 12 (1979) 1603.
G.H. Wannier, Phys. Rev. 90 (1953) 5.
H. Klar, J. Phys. B 14 (1981) 4165.
W. Raith, Hyp. Int. 73 (1992) 3.
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Weber, M., Hofmann, A., Raith, W. et al. Results of the Bielefeld-Brookhaven e+-H experiment. Hyperfine Interact 89, 221–242 (1994). https://doi.org/10.1007/BF02064508
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DOI: https://doi.org/10.1007/BF02064508