Energy Levels ofB10

Proton pick-up from nuclei in the middle of the 1p shell

“…From the measured 12C(d, 3He) reaction we know, however, that the contaminant peak contributes 10 ~o at most to the counting rate of the 9.60 MeV state. In addition the observed group behaves kinematically correct (mass 10) in the measured angular regio n. It is probable that the analog of this new state at 9.60 MeV has been observed at (11.53_+0.04)MeV in the I~B(3He,~)I~ reaction [14] with a comparably large width (270_+ 50)keV. In stripping reactions the state has not been observed neither in the reactions 9Be(d, p)l~ and 9Be(p, ~z+)l~ nor in proton stripping (d, n) on 9Be where the analog state could have been excited (Refs.…”

“…the 2-state at 6.26 MeV, weakly excited in the liB(t, e)l~ reaction [7] and the 3-state at 7.37 MeV are not excited in the (d, SHe) reaction, though their analogs at 7.54 MeV and at 8.89 MeV in 1~ have been observed with small cross section in the 11B(aHe, c01~ reaction [14]. There these states are probably excited predominantly via compound processes, which are unimportant for the (d, 3He) reaction at 52MeV.…”

Observation ofαdecay from a state in10B at 11.48 MeV

“…In fact, we believe α6 to be an experimental artifact caused by a sharp increase in the triple-coincidence detection efficiency close to the α + 6 Li(3.56) threshold, where the relative energy of the decay fragments becomes low about a factor of 20 higher than above 8.8 MeV. We identify α7 with the closely spaced 3 − and 2 + , T = 1 states at 8.89 MeV, unresolved owing to the finite experimental resolution, and α8 with a state at 11.52(4) MeV of unknown spin, parity, and isospin but seen in several previous experiments [16] including a previous measurement of the 3 He + 11 B → α + 10 B reaction [20]. This state is the subject of the present paper, and we determine the energy to be 11.48(3) MeV.…”