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Role of the Target Orientation Angle and Orbital Angular Momentum in the Evaporation Residue Production

G. FazioINFN, Sezione di Catania, and Dipartimento di Fisica dell'Università di Messina, Messina, ItalyGiorgio GiardinaINFN, Sezione di Catania, and Dipartimento di Fisica dell'Università di Messina, Messina, ItalyF. HanappeUniversité Libre de Bruxelles, Bruxelles, BelgiumG. MandaglioINFN, Sezione di Catania, and Dipartimento di Fisica dell'Università di Messina, Messina, ItalyM. ManganaroINFN, Sezione di Catania, and Dipartimento di Fisica dell'Università di Messina, Messina, ItalyAkhtam I. MuminovDepartment of Heavy Ion Physics, Institute of Nuclear Physics, Tashkent, UzbekistanA. K. NasirovDepartment of Heavy Ion Physics, Institute of Nuclear Physics, Tashkent, UzbekistanCarmelo SaccàDipartimento di Scienze della Terra dell'Università di Messina, Messina, Italy
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Аннотация

The influence of the orientation angles of the target nucleus symmetry axis, relative to the beam direction, on the production of the evaporation residues is investigated for the 48Ca+154Sm reaction as a function of beam energy. At low energies (Ec.m. < 137 MeV), the yield of evaporation residues is observed only for collisions with small orientation angles (αT < 45°). At large energies (about Ec.m. = 140-180 MeV), all orientation angles αT can contribute to the evaporation residue cross section σER in the 10-100 mb range. At Ec.m. > 180 MeV, σER ranges approximately 0.1-10 mb because the fission barrier for a compound nucleus decreases with increasing excitation energy and angular momentum. ©2008 The Physical Society of Japan.

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