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

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 proceeding › Chapter

Abstract

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 language	English
Title of host publication	Doktorsavhandlingar vid Chalmers Tekniska Hogskola
Publisher	Chalmers Tekniska Hogskola
Pages	1-9
Number of pages	9
Edition	1455
Publication status	Published - 1998
Externally published	Yes

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.

New results on the halo structure of ⁸B. / 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.

Doktorsavhandlingar vid Chalmers Tekniska Hogskola. 1455. ed. Chalmers Tekniska Hogskola, 1998. p. 1-9.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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T1 - New results on the halo structure of 8B

AU - Smedberg, M. H.

AU - Baumann, T.

AU - Aumann, T.

AU - Axelsson, L.

AU - Bergmann, U.

AU - Borge, M. J.G.

AU - Cortina-Gil, D.

AU - Fraile, L. M.

AU - Geissel, H.

AU - Grigorenko, L.

AU - Hellstrom, M.

AU - Ivanov, M.

AU - Iwasa, N.

AU - Janik, R.

AU - Jonson, B.

PY - 1998

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AB - 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.

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