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New insight into the low-energy He-9 spectrum


Golovkov, M.S. ; Grigorenko, L.V. ; Fomichev, A.S. ; Gorshkov, A.V. ; Gorshkov, V.A. ; Krupko, S.A. ; Oganessian, Yu.Ts. ; Rodin, A.M. ; Sidorchuk, S.I. ; Slepnev, R.S. ; Stepantsov, S.V. ; Ter-Akopian, G.M. ; Wolski, R. ; Korsheninnikov, A.A. ; Nikolskii, E.Yu. ; Kuzmin, V.A. ; Novatskii, B.G. ; Stepanov, D.N. ; Fortier, S. ; Roussel-Chomaz, P. ; Mittig, W.

Published in: Phys.Rev.
Year: 2007
Vol.: C76
Page No: 021605
Pages: 5

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.

Web-Page: http://link.aps.org/abstract/PRC/V76/E021605

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