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New results on the halo structure of B-8

AuthorsSmedberg, M. H.; Baumann, T.; Aumann, T.; Axelsson, L.; Bergmann, U.; García Borge, María José ; Cortina-Gil, D.; Fraile, Luis M. ; Geissel, H.; Grigorenko, L.; Hellström, M.; Ivanov, M.; Iwasa, N.; Janik, R.; Jonson, B.; Lenske, H.; Markenroth, K.; Münzenberg, G.; Nilsson, T.; Richter, Achim W.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Schwab, W.; Simon, H.; Sitar, B.; Strmen, P.; Sümmerer, K.; Winkler, M.; Zhukov, M. V.
KeywordsUnstable nuclei
Breakup reactions
Momentum distributions
One-proton removal cross section
Nuclear structure
[PACS] Breakup and momentum distributions
[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Issue Date15-Apr-1999
CitationPhysics Letters B 452(1-2): 1-7 (1999)
AbstractThe longitudinal momentum distribution of Be-7 fragments after fragmentation of B-8 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-8 ground state. The momentum distribution and the: one-proton removal cross section are shown to be reproduced with a three-body wave function for B-8 where the target is treated as a black disc in the breakup process.
Description7 pages, 1 table, 3 figures.-- PACS nrs.: 25.60.Gc; 27.20.+n.
Publisher version (URL)http://dx.doi.org/10.1016/S0370-2693(99)00245-2
Appears in Collections:(CFMAC-IEM) Artículos
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