Problems with interpretation of 10He ground state
Abstract
The continuum of 10He nucleus is studied theoretically in a three-body 8He+n+n model basing on the recent information concerning 9He spectrum [Golovkov, et al., Phys. Rev. C 76, 021605(R) (2007)]. The 10He ground state (g.s.) candidate with structure [p1/2]2 for new g.s. energy of 9He is predicted to be at about 2.0-2.3 MeV. The peak in the cross section associated with this state may be shifted to a lower energy (e.g. 1.2 MeV) when 10He is populated in reactions with 11Li due to peculiar reaction mechanism. Formation of the low-energy (E< 250 keV) ``alternative'' ground state with structure [s1/2]2 is highly probable in 10He in the case of considerable attraction (e.g. a<-5 fm) in the s-wave 9He channel, which properties are still quite uncertain. This result either questions the existing experimental low-energy spectrum of 10He or place a limit on the scattering length in 9He channel, which contradicts existing data.
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