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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Kernphysik / Spektroskopie

HK 52.6: Talk

Thursday, March 15, 2007, 18:15–18:30, B

A mass-data-based description of fusion reactions — Genevieve Mouze and •Christian Ythier — Faculte des Sciences, Universite de Nice, France

Any heavy nucleus has a tendency to dissociate into a dinuclear system, made of core and cluster, having a definite Coulomb barrier and a definite internal energy. This allows a new description of fusion reactions,in which the excitation energy of the compound nucleus is made of two parts, an intrinsic and an extrinsic excitation energy. For example, the yield of 262Bh formed in two different reactions depends on the intrinsic excitation energy of the compact compound nucleus 263Bh; the maximal yrast level obtainable in the gamma-deexcitation of two different levels of a nucleus formed at two different projectile energies can be the same, since it depends only on the intrinsic excitation energy after particle evaporation. The case of a negative affinity of dissociation will be discussed. Entrance-channel effects depend on intrinsic properties of the compound nucleus. Bohr's model of the compound nucleus must be reviewed: this revision is necessary for understanding the synthesis of superheavy elements.