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arxiv 1906.07818 v2 pith:PCAIJDIF submitted 2019-06-18 nucl-ex

Observation of the ⁷H excited state

classification nucl-ex
keywords angularcircenergymassmissingspectrumstateamev
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The $^7$H system was populated in the $^2$H($^8$He,$^3$He)$^7$H reaction with a 26 AMeV $^8$He beam. The $^{7}$H missing mass energy spectrum, the $^{3}$H energy and angular distributions in the $^7$H decay frame were reconstructed. The $^7$H missing mass spectrum shows a peak which can be interpreted either as unresolved $5/2^+$ and $3/2^+$ doublet or one of these states at 6.5(5) MeV. The data also provide indications on the $1/2^+$ ground state of $^7$H located at 2.0(5) MeV with quite a low population cross section of $\sim 10$ $\mu$b/sr within angular range $\theta_{\text{cm}} \simeq 6^{\circ} - 30^{\circ}$.

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