An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide split...

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An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide splits spontaneously
\( P \) into two alpha particles. The unknown nuclide is :
(A) \( { }_{4} \mathrm{Be}^{9} \)
(B) \( { }_{3} \mathrm{Li}^{7} \)
(C) \( { }_{2} \mathrm{He}^{4} \)
(D) \( { }_{5} \mathrm{~B}^{10} \)
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