why would an alpha particle ejects neutron when bombarded on berreylium? [closed]

when an alpha particle hit berrelyium it emits neutron. Does the alpha particle causes unstability to the nucleus or any other reason?

• Alpha particle is itself a nucleus, just a relatively little one. Then again, beryllium is not awfully large either. Imagine a head-on collision of Earth and Mars; I have a vague feeling you wouldn't want to describe it in terms like "Mars causes instability to Earth". – Ivan Neretin May 22 '18 at 7:23
• So then it is due to the kinetic energy of the alpha particles. Is this true? – khankk May 22 '18 at 8:37
• Yes, you may put it this way. – Ivan Neretin May 22 '18 at 9:01
• I disagree with @IvanNeretin's comment. This is a quite well known nuclear reaction, 9Be($\alpha$,n)12C (amongst other things well known as the neutron spark plug for the first atomic bomb). The 13C intermediate nucleus that is formed is some 10MeV above the ground state. One relaxation path is through releasing a neutron to leave 12C. (Remember that you need to conserve both energy and momentum in the center-of-mass frame of the interaction.) The overall Q value for this reaction is about 5MeV. – Jon Custer May 22 '18 at 13:30