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Journal Articles Physical Review C Year : 2007

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

M.S. Golovkov
  • Function : Author
L.V. Grigorenko
  • Function : Author
A.S. Fomichev
  • Function : Author
A.V. Gorshkov
  • Function : Author
V.A. Gorshkov
  • Function : Author
S.A. Krupko
  • Function : Author
Yu.Ts. Oganessian
  • Function : Author
A.M. Rodin
  • Function : Author
S.I. Sidorchuk
  • Function : Author
R.S. Slepnev
  • Function : Author
S.V. Stepantsov
  • Function : Author
G.M. Ter-Akopian
  • Function : Author
R. Wolski
  • Function : Author
A.A. Korsheninnikov
  • Function : Author
E.Yu. Nikolskii
  • Function : Author
V.A. Kuzmin
  • Function : Author
B.G. Novatskii
  • Function : Author
D.N. Stepanov
  • Function : Author

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.

Dates and versions

in2p3-00090280 , version 1 (29-08-2006)

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Cite

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, 2007, 76, pp.021605. ⟨10.1103/PhysRevC.76.021605⟩. ⟨in2p3-00090280⟩
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