New results on the halo structure of 8B

M. H. Smedberg, T. Baumann, T. Aumann, L. Axelsson, U. Bergmann, M. J.G. Borge, D. Cortina-Gil, L. M. Fraile, H. Geissel, L. Grigorenko, M. Hellstrom, M. Ivanov, N. Iwasa, R. Janik, B. Jonson

Research output: Chapter in Book/Report/Conference proceedingChapter


The longitudinal momentum distribution of 7Be fragments after fragmentation of 8B and the one-proton removal cross section (σ-1p) in a carbon target were measured at 1440 MeV/u with the fragment separator FRS used as an energy-loss spectrometer. The results show a narrow momentum distribution with a FWHM value of 91±5 MeV/c and a large cross-section, σ-1p = 98±6 mb. Both these results support the interpretation of a spatially extended proton orbit forming a halo in the 8B ground state. The momentum distribution and the one-proton removal cross section are shown to be reproduced with a three-body wave function for 8B where the target is treated as a black disc in the breakup process.

Original languageEnglish
Title of host publicationDoktorsavhandlingar vid Chalmers Tekniska Hogskola
PublisherChalmers Tekniska Hogskola
Number of pages9
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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    Smedberg, M. H., Baumann, T., Aumann, T., Axelsson, L., Bergmann, U., Borge, M. J. G., Cortina-Gil, D., Fraile, L. M., Geissel, H., Grigorenko, L., Hellstrom, M., Ivanov, M., Iwasa, N., Janik, R., & Jonson, B. (1998). New results on the halo structure of 8B. In Doktorsavhandlingar vid Chalmers Tekniska Hogskola (1455 ed., pp. 1-9). Chalmers Tekniska Hogskola.