Angular correlations between heavy ions and $α$ particles in ${}^{16}O$ + ${}^{27}{Al}$ collisions at 87.4 MeV: Evidence of sequential decay of projectilelike fragments

Angular correlations have been investigated between projectilelike fragments (from Li to O) and α particles in

{}^{16}O

{}^{27}{Al}

collisions at 87.4 MeV. For C-

α

and O-

α

correlations, clear evidence of the sequential

α

decays of projectilelike fragments was observed at forward angles. In

{}^{27}{Al} ({}^{16}O, {}^{12}C (g . s .) α) {}^{27}{Al} (g . s .)

, the reaction proceeds mainly via the sequential

α

decay of the excited

{}^{16}O

nucleus at

E_{α} ≅ 10, 11.6, 13.2, 15.2, 16.2, and 21

MeV. For the O-

α

case, evidence of the sequential α decay of

{}^{20}{Ne}

* (

E_{x} ≅ 8.7, 12.0, and 15.2

MeV) was observed.

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Angular correlations between heavy ions andαparticles inO16+Al27collisions at 87.4 MeV: Evidence of sequential decay of projectilelike fragments