A certain stable nucleide, after absorbing a neutron, emits $\beta$-particle and the new nucleide splits spontaneously into two $\alpha$-particles. The nucleide is

  • A

    ${ }_2^4 He$

  • B

    ${ }_3^7 Li$

  • C

    ${ }_4^6 Be$

  • D

    ${ }_3^6 Li$

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