Difference in evaporation residue yields in the cold and hot fusion reactions

International Symposium on Entrance Channel Effect on the Reaction Mechanism in Heavy Ion Collisions

Nasirov, Avazbek^1,2 ; Giardina, Giorgio^3,4,5 ; Mandaglio, Giuseppe^3,4,5 ; Kim, Kyungil^6 ; Kim, Youngman^6

BLTP, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Russia^1

Institute of Nuclear Physics, Ulugbek, 100214, Tashkent, Uzbekistan^2

Dipartimento di Fisica e di Scienze della Terra Dell' Universitè di Messina, SalitaSperone 31, 98166 Messina, Italy^3

Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Italy^4

Centro Siciliano di Fisica Nucleare e Struttura della Materia, 95125 Catania, Italy^5

Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Korea, Republic of^6

关键词: Evaporation residues;    Formation mechanism;    Heavy ion collision;    Microscopic modeling;    Nucleus reactions;    Super-heavy element;    Superheavy nuclei;    Survival probabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/515/1/012015/pdf
DOI  :  10.1088/1742-6596/515/1/012015

来源: IOP

【 摘 要 】

An interest to study the mechanism of the complete fusion with massive nucleus reactions was caused by difficulties of synthesizing superheavy elements due to their small cross sections. Theoretical models used to obtain knowledge about fusion mechanism in heavy ion collisions at low energies are requested. We present the theoretical results of the compound nucleus (CN) formation and evaporation residue (ER) cross sections obtained for the48Ca+248Cm and58Fe+232Th reactions leading to the formation of CN with A 296 and A 290 of the superheavy element Lv (Z 116), respectively. The ER cross sections, which can be measured directly, are determined by the complete fusion and survival probabilities of the heated and rotating CN. Those probabilities can not be measured unambiguously but the knowledge about them is important to study the formation mechanism of the observed products and to estimate the ER cross sections of the expected isotopes of elements. For this aim, the48Ca+249Cf and64Ni+232Th reactions are also considered. The survival probability of the heated and rotating CN is sensitive to the used mass and shell correction values of superheavy nuclei. The ER cross sections obtained by using the macroscopic-microscopic model with mass and fission barrier values calculated by Warsaw group lead to smaller ER values for all reactions in comparison with the case when the masses and shell correction calculated by P. Moller et al are used.