The1330 keV Resonance Level of the Be^9(p,γ)B^<10> Reaction and Excited States of B^<10>

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A broad resonance (T_<lab>=383keV) was observed around E_p=1330 keV in the measurement of excitation function of Be^9(p,γ)B^<10> reaction in the proton energy region from 1200 to 1900 keV. At this level, 7.78 MeV γ-ray(γ_0) was predominant (>83%) among the capture γ-rays, and its angular distribution was isotropic within the experimental error. Obtained T_γ was 14.6±1.5 eV. These results support the assignment 2^- to this level, but the strong E1 transition to the ground state should suggest a large admixture of isotopic spin impurity of T=1 in T=0 at this level. The branching ratio of decaying γ-rays, the angular distribution and the large isotopic spin admixture are interpreted by the jj-coupling shell model, and the 1330 keV level is identified as a weak coupling s-wave proton resonance analogous to the 330 keV level. On the basis of this identification, other broad lev'els at E_x.=720, 8.07, 8.66, 9.7 and 10.7 MeV in B^<10> ane interpreted in terms of the "core(Be^9 or B^9) excitation" of B^<10> nucleus, and J^π and T of these levels are tentatively assigned.
社団法人日本物理学会の論文
1963-09-05