Search for radiative transitions in the hypernucleusΛ10B

A search for radiative transitions between 0.100 and 0.9 MeV from the p-shell hypernucleus ${}_{\mathrm{\Lambda }}{}^{10}{}_{}{}^{}\mathrm{B}$ was undertaken. Of special interest are the M1 spin-flip transitions between members of the doublet formed by coupling an s-shell Λ hyperon to the nuclear core. No such transitions were observed in this energy range attributable to ${}_{\mathrm{\Lambda }}{}^{10}{}_{}{}^{}\mathrm{B}$. This negative result provides additional constraints on the parameters of the p-shell Λ-nucleon effective potential. Evidence is presented of the observation of a γ ray which may be attributed to either the hyperfragment ${}_{\mathrm{\Lambda }}{}^8{}_{}{}^{}\mathrm{Li}$ or ${}_{\mathrm{\Lambda }}{}^8{}_{}{}^{}\mathrm{Be}$. A cross section for the exclusive reaction ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$(π,π’ ${)}^7$o/r${\mathit{Li}}^{\mathrm{*}}$ (${\mathit{E}}_{\mathit{x}}$=478 keV) of 2.2±0.3 mb/sr was also obtained.