Abstract
A previously published measurement of the ground state resonance of 10 He, populated by a reaction of a 59 MeV/u 14 Be beam on a deuterated polyethylene target, was further analyzed to search for 4 n emission resulting from 2p removal. No evidence for 4n events was found. A lower limit of about 1 MeV was determined for a possible resonance in 12 He.
Highlights
There is some controversy over the location of the ground state of 10He
A missing-mass measurement performed at JINR in Dubna populated 10He via a (t,p) reaction on 8He and found the ground state to be at 2.1(2) MeV [1] in contrast to another measurement done at GSI using proton knockout from 11Li, which found the ground state to be lower at 1.54(11) MeV [2]
A recent measurement at the NSCL populated 10He through 2p2n removal from 14Be and found the 3-body resonance to be at 1.6(25) MeV [4]
Summary
There is some controversy over the location of the ground state of 10He. Recently, a missing-mass measurement performed at JINR in Dubna populated 10He via a (t,p) reaction on 8He and found the ground state to be at 2.1(2) MeV [1] in contrast to another measurement done at GSI using proton knockout from 11Li, which found the ground state to be lower at 1.54(11) MeV [2]. A recent measurement at the NSCL populated 10He through 2p2n removal from 14Be and found the 3-body resonance to be at 1.6(25) MeV [4] This reaction was considered to be more dissipative and so the invariant mass spectrum should not be influenced by the proposed initial state effects – yet a lower energy was observed. In this work we investigate possible evidence for direct cluster removal and search for a potential resonance in 12He
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