First observation of a nuclear s-state of hypernucleus, 15 C
Abstract
Bound-systems of ---14 N are studied via - capture at rest followed by emission of a twin single- hypernucleus in the emulsion detectors. Two events forming extremely deep - bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as -+14 N5 He+5 He+4 He+n. Since there are no excited states for daughter particles, the binding energy of the - hyperon, B-, in 14 N nucleus was uniquely determined to be 6.27 0.27 MeV. Another ---14 N system via the decay 9 Be + 5 He + n brings a B- value, 8.00 0.77 MeV or 4.96 0.77 MeV, where the two possible values of B- correspond to the ground and the excited states of the daughter 9 Be nucleus, respectively. Because the B- values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear 1p state of the ---14 N system, these new events give the first indication of the nuclear 1s state of the hypernucleus, 15 C.
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