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. Hellström, M. Ivanov, N. Iwasa, R. Janik, B. Jonson, H. Lenske, K. Markenroth, G. Münzenberg, T. Nilsson, A. RichterK. Riisager, C. Scheidenberger, G. Schrieder, W. Schwab, H. Simon, B. Sitar, P. Strmen, K. Sümmerer, M. Winkler, M. V. Zhukov

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77 Citations (Scopus)


The longitudinal momentum distribution of Be fragments after fragmentation of B 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 B 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
Pages (from-to)1-7
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 1999
Externally publishedYes


  • Breakup reactions
  • Momentum distributions
  • Nuclear structure
  • One-proton removal cross section
  • Unstable nuclei

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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