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New insight into the low-energy He9 spectrum

M. S. Golovkov, L. V. Grigorenko, A. S. Fomichev, A. V. Gorshkov, V. A. Gorshkov, S. A. Krupko, Yu. Ts. Oganessian, A. M. Rodin, S. I. Sidorchuk, R. S. Slepnev, S. V. Stepantsov, G. M. Ter-Akopian, R. Wolski, A. A. Korsheninnikov, E. Yu. Nikolskii, V. A. Kuzmin, B. G. Novatskii, D. N. Stepanov, P. Roussel-Chomaz, and W. Mittig
Phys. Rev. C 76, 021605(R) – Published 21 August 2007

Abstract

The spectrum of He9 was studied by means of the H2(He8,p)He9 reaction at a laboratory energy of 25 MeV/nucleon and small center-of-mass angles. Energy and angular correlations were obtained for the He9 decay products by complete kinematical reconstruction. The lowest resonant state of He9 is found at 2.0 ± 0.2 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 1/2+ state (a limit a>20 fm is obtained for the scattering length), and with a 5/2+ resonance at energy 4.2 MeV.

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  • Received 14 July 2006

DOI:https://doi.org/10.1103/PhysRevC.76.021605

©2007 American Physical Society

Authors & Affiliations

M. S. Golovkov1, L. V. Grigorenko1, A. S. Fomichev1, A. V. Gorshkov1, V. A. Gorshkov1, S. A. Krupko1, Yu. Ts. Oganessian1, A. M. Rodin1, S. I. Sidorchuk1, R. S. Slepnev1, S. V. Stepantsov1, G. M. Ter-Akopian1, R. Wolski1,2, A. A. Korsheninnikov3,4, E. Yu. Nikolskii3,4, V. A. Kuzmin4, B. G. Novatskii4, D. N. Stepanov4, P. Roussel-Chomaz5, and W. Mittig5

  • 1Flerov Laboratory of Nuclear Reactions, JINR, Dubna, RU-141980 Russia
  • 2The Henryk Niewodniczański Institute of Nuclear Physics, Kraków, Poland
  • 3RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
  • 4RRC “The Kurchatov Institute,” Kurchatov sq. 1, 123182 Moscow, Russia
  • 5GANIL, BP 5027, F-14076 Caen Cedex 5, France

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Vol. 76, Iss. 2 — August 2007

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