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dc.contributor.authorAumann, T.-
dc.contributor.authorAleksandrov, D.-
dc.contributor.authorAxelsson, L.-
dc.contributor.authorBaumann, T.-
dc.contributor.authorGarcía Borge, María José-
dc.contributor.authorSuzuki, T.-
dc.contributor.authorTengblad, Olof-
dc.contributor.authorZhukov, M. V.-
dc.identifierdoi: 10.1103/PhysRevC.59.1252-
dc.identifierissn: 0556-2813-
dc.identifier.citationPhysical Review C - Nuclear Physics 59: 1252-1262 (1999)-
dc.descriptionT. Aumann et al. ; 11 págs.; 6 figs.; 2 tabs. ; PACS number(s): 27.20.1n, 25.60.Gc, 25.70.De, 29.30.Hs-
dc.description.abstractThe three-body breakup 6He→4He+n+n is studied experimentally, using a secondary 6He ion beam of 240 MeV/nucleon incident on carbon and lead targets. Integrated cross sections for one-and two-neutron knockout and differential cross sections dσ/dE* and dσ/dv for inelastic nuclear or electromagnetic excitations into the 6He continuum are presented. The E1-strength distribution is deduced from electromagnetic cross sections and is found to exhaust (10±2)% of the energy-weighted Thomas-Reiche-Kuhn sum rule or (40±8)% of the cluster sum rule for excitation energies below 5 MeV. Both the energy-weighted and non-energy-weighted dipole cluster sum rules are almost exhausted integrating the strength up to 10 MeV, a fact from which the root-mean-square distance between the α core and the two valence neutrons of rα-2n = (3.36±0.39) fm is derived. The known IΠ=2+ (1.80 MeV) resonance in 6He is observed in nuclear inelastic scattering; model-dependent values of the quadrupole deformation parameter δ2=( 1.7 ±0.3) fm or B(E2,0+→2+ ) = (3.2±0.6)e2 fm4 are derived. No clear signature could be obtained for predicted higherlying 2+ resonances, but low-lying continuum strength of multipolarity other than dipole, likely of monopole and quadrupole multipolarity, is indicated by the data. Two-body correlations in the decaying 4He+n+n system are investigated. The astrophysical relevance of the data with regard to the two-neutron capture process 4He(2n,γ)6He is briefly discussed. ©1999 American Physical Society-
dc.description.sponsorshipThis work was supported by the German Federal Minister for Education and Research (BMBF) under Contracts No. 06 DA 820, 06 OF 474 and 06 MZ 864 and by GSI via Hochschulzusammenarbeitsvereinbarungen under Contracts No. DARIK, No. OF ELK, MZ KRK and partly supported by the Polish Committee of Scientific Research under Contract No. PB2/P03B/113/09, EC under Contract No. ERBCHGECT92- 0003, and the Spanish CICYT under Contract No. AEN92-0788-C02-02 (M.J.G.B.), and by Deutsche Forschungsgemeinschaft (DFG) under Contract No. 436 RUS 130/127/1. One of us (B.J.) acknowledges support through an Alexander von Humboldt Senior Research Scientist Award.-
dc.publisherAmerican Physical Society-
dc.relation.isversionofPublisher's version-
dc.titleContinuum excitations in 6He-
dc.description.versionPeer Reviewed-
dc.contributor.funderFederal Ministry of Education and Research (Germany)-
dc.contributor.funderGerman Research Foundation-
dc.contributor.funderAlexander von Humboldt Foundation-
dc.contributor.funderHelmholtz Centre for Heavy Ion Research-
dc.contributor.funderPolish Academy of Sciences-
dc.contributor.funderComisión Interministerial de Ciencia y Tecnología, CICYT (España)-
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