# Study of $^{7}$He via high-energy neutron removal from $^{8}$He

Abstract : The spectroscopy of the neutron-rich unbound system $^{7}$He has been investigated through high-energy neutron-removal from a $^{8}$He beam and coincident detection of the $^{6}$He charged fragment and neutron from the in-flight decay. Concerning the structure of $^{7}$He, there is a question as to the existence of an excited state (½-) 1 MeV above the $^{6}$He+n threshold. Experimentally, the $^{6}$He fragments were detected using a Si-Si-CsI telescope and the neutrons using the DEMON liquid scintillator array. From such a kinematically complete measurement it has been possible to reconstruct the $^{7}$He invariant mass spectrum. Preliminary analysis shows at present little or no evidence for any excited states.
Document type :
Poster communications

http://hal.in2p3.fr/in2p3-00142468
Contributor : Sandrine Guesnon <>
Submitted on : Thursday, April 19, 2007 - 11:34:56 AM
Last modification on : Tuesday, February 5, 2019 - 12:12:08 PM

### Identifiers

• HAL Id : in2p3-00142468, version 1

### Citation

H. Al Falou. Study of $^{7}$He via high-energy neutron removal from $^{8}$He. 12th Euroschool on Exotic Beams, Aug 2005, Mainz, Germany. 2005. ⟨in2p3-00142468⟩

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