/ Experiment-Nucl arXiv:0804.0310

The He-8 and He-10 spectra studied in the (t,p) reaction

Golovkov, M.S. (Dubna, JINR) ; Grigorenko, L.V. (Dubna, JINR) ; Ter-Akopian, G.M. (Dubna, JINR) ; Fomichev, A.S. (Dubna, JINR) ; Oganessian, Yu.Ts. (Dubna, JINR) ; Gorshkov, V.A. (Dubna, JINR) ; Krupko, S.A. (Dubna, JINR) ; Rodin, A.M. (Dubna, JINR) ; Sidorchuk, S.I. (Dubna, JINR) ; Slepnev, R.S. (Dubna, JINR) ; Stepantsov, S.V. (Dubna, JINR) ; Wolski, R. (Kurchatov Inst., Moscow) ; Pang, D.Y. (Kurchatov Inst., Moscow) ; Chudoba, V. (Kurchatov Inst., Moscow) ; Korsheninnikov, A.A. (Kurchatov Inst., Moscow) ; Kuzmin, E.A. (Kurchatov Inst., Moscow) ; Nikolskii, E.Yu. (Kurchatov Inst., Moscow) ; Novatskii, B.G. (Kurchatov Inst., Moscow) ; Stepanov, D.N. (Kurchatov Inst., Moscow) ; Roussel-Chomaz, P. (GANIL) ; Mittig, W. (GANIL) ; Ninane, A. (Louvain U.) ; Hanappe, F. (Brussels U.) ; Stuttge, L. (Louis Pasteur U., Strasbourg I) ; Yukhimchuk, A.A. (RFNC-VNIIEF, Sarov) ; Perevozchikov, V.V. (RFNC-VNIIEF, Sarov) ; Vinogradov, Yu.I. (RFNC-VNIIEF, Sarov) ; Grishechkin, S.K. (RFNC-VNIIEF, Sarov) ; Zlatoustovskiy, S.V. (RFNC-VNIIEF, Sarov) ; Golovkov, M.S. (Dubna, JINR)

Published in: Phys.Lett.
Year: 2009
Vol.: B672
Page No: 22-29
Pages: 18

Abstract: The low-lying spectra of $^8$He and $^{10}$He nuclei were studied in the $^3$H($^6$He,$p$)$^8$He and $^3$H($^8$He,$p$)$^{10}$He transfer reactions. The $0^+$ ground state (g.s.) of $^8$He and excited states, $2^+$ at $3.6-3.9$ MeV and $(1^+)$ at $5.3-5.5$ MeV, were populated with cross sections of 200, 100-250, and 90-125 $\mu$b/sr, respectively. Some evidence for $^8$He state at about 7.5 MeV is obtained. We discuss a possible nature of the near-threshold anomaly above 2.14 MeV in $^8$He and relate it to the population of a $1^-$ continuum (soft dipole excitation) with peak value at about 3 MeV. The lowest energy group of events in the $^{10}$He spectrum was observed at $\sim 3$ MeV with a cross section of $\sim 140$ $\mu$b/sr. We argue that this result is possibly consistent with the previously reported observation of $^{10}$He, in that case providing a new g.s. position for $^{10}$He at about 3 MeV.

Keyword(s): 6He ; 8He beams ; Tritium gas target ; Resonance states ; Hyperspherical harmonic method ; Soft dipole mode ; Neutron halo

Web-Page: http://inspirebeta.net/record/782584/files/aa-01-setup.png; http://inspirebeta.net/record/782584/files/aa-02-he8-exp.png; http://inspirebeta.net/record/782584/files/aa-03-he10-exp.png; http://inspirebeta.net/record/782584/files/aa-04-spec-fac.png; http://inspirebeta.net/record/782584/files/aa-05-he8-soft-th.png; http://inspirebeta.net/record/782584/files/aa-06-he8-soft-0.png; http://inspirebeta.net/record/782584/files/aa-07-he10-th-comp.png; http://inspirebeta.net/record/782584/files/aa-08-he10-en-dis-1.png; http://inspirebeta.net/record/782584/files/aa-08-he10-en-dis-2.png

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