Experimental investigations of the nuclear level density by using heavy ion reactions

摘要: The transition of the level density parameter aoff from low excitation energy value aoff=A/8 MeV−1 to Fermi gas aFG ∼ A/15 was discovered a few years ago studying particle spectra evaporated hot compound systems A∼ 160. A number experiments have been recently performed confirm earlier findings and extend investigation other mass regions higher energies. Furthermore, precision coincidence done in lead region which evaporation residues are tagged by gammarays. Those open possibility detailed study densities nuclei where shell effects important.