Abstract
A study is made of the isotopic composition of primary cosmic ray boron and carbon in the energy interval 135–390 MeV/n. The quotients11B/(10B +11B) = 0.61 ±0.12 and13C/(12C +13C) = 0.06 ±0.04, valid at the top of the atmosphere, are obtained from photometric measurements on tracks found in an Ilford G5 emulsion stack exposed to the radiation.
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Jönsson, G., Kristiansson, K., Malmqvist, L.: Astrophys. Space Sci.7, 231 (1970)
Bogdanov, S.D., Ostroumov, V.I.: Isvestija Academii Nauk, U.S.S.R.38, 1811 (1974)
Beaujean, R., Sagebiel, H., Enge, W.: 15th Int. Cosmic Ray Conf., Plovdiv, Bulgaria,1, 329 (1977)
Garcia-Munoz, M., Mason, G.M., Simpson, J.A.: Astrophys. J. Letters201, L145 (1975)
Garcia-Munoz, M., Mason, G.M., Simpson, J.A.: Proceedings of the 15th Int. Cosmic Ray Conf., Plovdiv, Bulgaria,1, 301 (1977)
Webber, W.R., Lezniak, J.A., Kish, J.C., Simpson, G.A.: Astrophys. Lett.18, 125 (1977)
Hagen, F.A., Fisher, A.J., Ormes, J.F.: Astrophys. J.212, 262 (1977)
Dwyer, R.: Astrophys. J.224, 691 (1978)
Buffington, A., Orth, C.D., Mast, T.S.: Astrophys. J.226, 355 (1978)
Bjarle, C., Herrström, N-Y., Jacobsson, L., Jönsson, G., Kristiansson, K.: 15th Int. Cosmic Ray Conf., Plovdiv, Bulgaria,1, 313 (1977)
Jönsson, G., Kristiansson, K., Malmqvist, L.: Nucl. Instr. Meth.84, 282 (1970)
Andersson, R., Larsson, L., Mathiesen, O.: Lund University Preprint LUIP-CR-73-02 (1973)
Jacobsson, L.: Lund University Preprint LUIP 7702 (1977)
Behrnetz, S., Kristiansson, K., Lindstam, S., Söderström, K.: Lund University Preprint LU1P-CR-73-01 (1973)
Malmqvist, L.: Nucl. Instr. Meth.84, 289 (1970)
Fisher, A.J., Hagen, F.A., Maehl, R.C., Ormes, J.F., Arens, J.F.: Astrophys. J.205, 938 (1976)
Silberberg, R., Tsao, C.H.: Astrophys. J. Suppl., Series25, 315 (1973)
Silberberg, R., Tsao, C.H.: ibid25, 335 (1973)
Lindstrom, P.J., Greiner, D.E., Heckman, H.H., Cork, B., Bieser, F.S.: Lawrence Berkeley Laboratory Preprint LBL-3650 (1975)
Malmqvist, K.: Lund University Preprint KS 7007 (1970)
Garcia-Munoz, M., Mason, G.M., Simpson, J.A.: Astrophys. J. 202, 265(1975)
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We wish to express our sincere gratitude to Dr. Lars Jacobsson for his advice during the analysis. We are grateful to Research Engineer Birgit Lindkvist for the processing of the plates and to the Office of Naval Research, Washington D.C. for the balloon exposure of the emulsion stack. The support of the Swedish Natural Science Research Council is gratefully acknowledged.
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Bjarle, C., Herrström, N.Y., Jönsson, G. et al. The cosmic ray boron and carbon isotopic composition measured in nuclear emulsions. Z Physik A 291, 383–390 (1979). https://doi.org/10.1007/BF01408389
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DOI: https://doi.org/10.1007/BF01408389