Short timescale behavior of colliding heavy nuclei at intermediate energies

الأصل · EN

An Antisymmetrized Molecular Dynamics model is used to explore the collision of ¹¹⁴Cd projectiles with ⁹²Mo target nuclei at E/A=50 MeV over a broad range in impact parameter. The atomic number (Z), velocity, and emission pattern of the reaction products are examined as a function of the impact parameter and the cluster recognition time. The non-central collisions are found to be essentially binary in character resulting in the formation of an excited projectile-like fragment (PLF*) and target-like fragment (TLF*). The decay of these fragments occurs on a short timescale, 100≤300 fm/c. The average excitation energy deduced for the PLF* and TLF* `saturates for mid-central collisions, 3.5≤6 fm, with its magnitude depending on the cluster recognition time. For short cluster recognition times (t=150 fm/c), an average excitation energy as high as ≈6 MeV is predicted. Short timescale emission leads to a loss of initial correlations and results in features such as an anisotropic emission pattern of both IMFs and alpha particles emitted from the PLF* and TLF* in peripheral collisions.