Evidence of a new state in $^{11}$Be observed in the $^{11}$Li $β$-decay

Details Evidence of a new state in $^{11}$Be observed in the $^{11}$Li $β$-decay Evidence of a new state in $^{11}$Be observed in the $^{11}$Li $β$-decay

2009-04-27

arxiv.org/abs/0904.4212v1

Phys.Lett.B677:255-259,2009

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 6 figures

Scientific paper

10.1016/j.physletb.2009.05.050

Coincidences between charged particles emitted in the $\beta$-decay of $^{11}$Li were observed using highly segmented detectors. The breakup channels involving three particles were studied in full kinematics allowing for the reconstruction of the excitation energy of the $^{11}$Be states participating in the decay. In particular, the contribution of a previously unobserved state at 16.3 MeV in $^{11}$Be has been identified selecting the $\alpha$ + $^7$He$\to\alpha$ + $^6$He+n channel. The angular correlations between the $\alpha$ particle and the center of mass of the $^6$He+n system favors spin and parity assignment of 3/2$^-$ for this state as well as for the previously known state at 18 MeV.

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