$\alpha:2n:\alpha$ molecular band in $^{10}$Be

Abstract : The 10.15 MeV resonance in $^{10}$Be has been probed via resonant $^{6}$He+$^{4}$He elastic scattering. It is demonstrated that it is the J$^{p}$i=4$^{+}$ member of a rotational band built on the 6.18 MeV 0$^{+ }$state. A Gammaalpha of 0.10–0.13 MeV and Gammaalpha/Gamma=0.35–0.46 were deduced. The corresponding reduced alpha width, gammaalpha2, indicates one of the largest alpha-cluster spectroscopic factors known. The deformation of the band, including the 7.54 MeV, 2$^{+}$ member, is large ([h-bar]2/2I=200 keV). Such a deformation and the significant degree of clusterization signals a well-developed alpha:2n:alpha molecular structure.
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Submitted on : Monday, February 6, 2006 - 9:32:41 AM
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M. Freer, E. Casarejos, N.L. Achouri, C. Angulo, N. I. Ashwood, et al.. $\alpha:2n:\alpha$ molecular band in $^{10}$Be. Physical Review Letters, American Physical Society, 2006, 96, pp.042501. ⟨10.1103/PhysRevLett.96.042501⟩. ⟨in2p3-00025562⟩



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