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)

Cite this

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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title = "New results on the halo structure of 8B",

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.",

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

note = "Funding Information: This work was supported by the German Federal Minister for Education and Research (BMBF) under Contracts 06 DA 820, 06 OF 474, and 06 MZ 476 and by GSI via Hochschulzusammenarbeitsvereinbarungen under Contracts DARIK, OF ELK, and MZ KRK. It was partly supported by the Polish Committee of Scientific Research under Contract PB2/P03B/113/09, EC under Contract ERBCHGE-CT92-0003, CICYT under Contract AEN96-1679 (MJGB, LMF), and by Deutsche Forschungsgemeinschaft (DFG) under Contract 436 RUS 130/127/1 and Le-439/1. One of us (B.J.) acknowledges the support through an Alexander von Humboldt Research Award.",

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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.

N1 - Funding Information: This work was supported by the German Federal Minister for Education and Research (BMBF) under Contracts 06 DA 820, 06 OF 474, and 06 MZ 476 and by GSI via Hochschulzusammenarbeitsvereinbarungen under Contracts DARIK, OF ELK, and MZ KRK. It was partly supported by the Polish Committee of Scientific Research under Contract PB2/P03B/113/09, EC under Contract ERBCHGE-CT92-0003, CICYT under Contract AEN96-1679 (MJGB, LMF), and by Deutsche Forschungsgemeinschaft (DFG) under Contract 436 RUS 130/127/1 and Le-439/1. One of us (B.J.) acknowledges the support through an Alexander von Humboldt Research Award.

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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New results on the halo structure of ⁸B

Abstract

ASJC Scopus subject areas

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