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New insight into the low-energy $^{9}$He spectrum

Abstract : The spectrum of $^9$He was studied by means of the $^8$He($d$,$p$)$^9$He reaction at a lab energy of 25 MeV/n and small center of mass (c.m.) angles. Energy and angular correlations were obtained for the $^9$He decay products by complete kinematical reconstruction. The data do not show narrow states at $\sim $1.3 and $\sim $2.4 MeV reported before for $^9$He. The lowest resonant state of $^9$He is found at about 2 MeV with a width of $\sim $2 MeV and is identified as $1/2^-$. The observed angular correlation pattern is uniquely explained by the interference of the $1/2^-$ resonance with a virtual state $1/2^+$ (limit on the scattering length is obtained as $a > -20$ fm), and with the $5/2^+$ resonance at energy $\geq 4.2$ MeV.
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Contributor : Michel Lion <>
Submitted on : Tuesday, August 29, 2006 - 3:39:24 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:31 PM

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M.S. Golovkov, L.V. Grigorenko, A.S. Fomichev, A.V. Gorshkov, V.A. Gorshkov, et al.. New insight into the low-energy $^{9}$He spectrum. Physical Review C, American Physical Society, 2007, 76, pp.021605. ⟨10.1103/PhysRevC.76.021605⟩. ⟨in2p3-00090280⟩



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