HAL : in2p3-00090280, version 1
 arXiv : nucl-ex/0608035
 Physical Review C 76 (2007) 021605
 New insight into the low-energy $^{9}$He spectrum
 (2007)
 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/nucl-ex/0608035
 in2p3-00090280, version 1 http://hal.in2p3.fr/in2p3-00090280 oai:hal.in2p3.fr:in2p3-00090280 Contributeur : Michel Lion <> Soumis le : Mardi 29 Août 2006, 15:39:24 Dernière modification le : Lundi 3 Septembre 2007, 11:04:26