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

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

2006-08-17

arxiv.org/abs/nucl-ex/0608035v1

Phys.Rev.C76:021605,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 4 figures, 2 tables

Scientific paper

10.1103/PhysRevC.76.021605

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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