First Results of a $^{8}$He+d Experiment

• Published in: AIP Conference Proceedings
• Main Authors: Golovkov, M.S., Grigorenko, L.V., Fomichev, A.S., Gorshkov, V.A., Gorshkov, A.V., 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, Roussel-Chomaz, P., Mittig, W.
• Other Authors: RIKEN Nishina Center for Accelerator-Based Science Wako (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research Japon (RIKEN), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Yu. E. Penionzhkevich, E. A. Cherepanov
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2006
• Subjects: helium; nuclei with mass number 6 to 19; angular correlation techniques; nuclear resonances; 27.20.+n; 23.20.En; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; khanty
• Online Access: https://hal.in2p3.fr/in2p3-00158762; https://doi.org/10.1063/1.2746578

International audience Secondary 8He beam delivered by the fragment separator ACCULINNA was used in an experiment designed for the simultaneous study of the 7H and 9He exotic nuclei. Attempt to observe 7H produced in the reaction 2H(8He,3He)7H resulted only in setting a cross section limit, d$\$sigma/d$\Omega$ < 20 µb/sr, for the reaction channel which could populate a resonance lying between 0 and 3 MeV above the 7H decay threshold. The spectrum of 9He was studied by means of the 2H(8He,p)9He reaction. Energy and angular correlations were obtained for the 9He decay products by complete kinematical reconstruction. The lowest resonant state of 9He is found at about 2 MeV with a width of ~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+ (a limit of a0 > −20 fm on the scattering length is obtained), and with a $5/2^+$ resonance located at ~4.2 MeV.