New results on the halo structure of 8B

Summary, in English

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.

• Author: M H Smedberg; T Baumann; T Aumann; L. Axelsson; U. C. 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 Richter; K. Riisager; C. Scheidenberger; G Schrieder; W Schwab; H. Simon; B. Sitar; P. Strmen; K. Sümmerer; M. Winkler; M V Zhukov
• Publishing year: 1999
• Language: English
• Pages: 1-7
• Publication/Series: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 452
• Issue: 1-2
• Links: http://dx.doi.org/10.1016/S0370-2693(99)00245-2
• Document type: Journal article
• Publisher: Elsevier
• Keywords: Breakup reactions; Momentum distributions; Nuclear structure; One-proton removal cross section; Unstable nuclei
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693