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The $^{8}$He and $^{10}$He spectra studied in the $(t$,$p)$ reaction

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.
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Preprints, Working Papers, ...
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Contributor : Michel Lion <>
Submitted on : Thursday, April 3, 2008 - 11:16:02 AM
Last modification on : Friday, May 8, 2020 - 1:10:04 AM

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  • HAL Id : in2p3-00269906, version 1
  • ARXIV : 0804.0310



M. S. Golovkov, L. V. Grigorenko, G. M. Ter-Akopian, A. S. Fomichev, Yu. Ts. Oganessian, et al.. The $^{8}$He and $^{10}$He spectra studied in the $(t$,$p)$ reaction. 2008. ⟨in2p3-00269906⟩



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