The role of orientation of nucleus symmetry axis in fusion dynamics

Nasirov, A. K.; Fukushima, Akira; Toyoshima, Yuka; Aritomo, Y.; Muminov, A. I.; Kalandarov, Sh. A.; Utamuratov, Ravshanbek

doi:10.1016/j.nuclphysa.2005.05.152

Cited by 116 publications

(167 citation statements)

References 44 publications

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“…The decay of DNS without reaching the equilibrated shape of the CN formation [7,10,11] is called quasifission process and its cross section is obtained by the following expression…”

Section: Resultsmentioning

confidence: 99%

“…[6,7,13 Hereafter, the CN excitation energy E * CN is used instead of the collision energy in the center-of-mass system E c.m. for the convenience of comparison of the reactions having large difference in the Coulomb barrier energies.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7]). In all of these works, the results of the comparison led to the same conclusions: the evaporation residue(ER) cross sections of the same heated and rotating CN are different even at the same value of the excitation energy E * CN .…”

Section: Introductionmentioning

confidence: 99%

“…The extent of the hindrance is determined by the peculiarities of the potential energy surface [refs. [3][4][5][6][7] which contains shell effects of the intrinsic structure of interacting nuclei that change nature during the lifetime and evolution of the dinuclear system(DNS) formed at capture of the projectile by the target. The hindrance to complete fusion is related with the increase of the quasifission events (decay of DNS into two fragments) which are in competition with the complete fusion events.…”

Section: Introductionmentioning

confidence: 99%

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Real causes of apparent abnormal results in heavy ion reactions

Mandaglio

Nasirov

Anastasi

et al. 2015

EPJ Web of Conferences

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Abstract. We study the effect of the static characteristics of nuclei and dynamics of the nucleus-nucleus interaction in the capture stage of reaction, in the competition between quasifission and complete fusion processes, as well as the angular momentum dependence of the competition between fission and evaporation processes along the de-excitation cascade of the compound nucleus. The results calculated for the mass-asymmetric and less mass-asymmetric reactions in the entrance channel are analyzed in order to investigate the role of the dynamical effects on the yields of the evaporation residue nuclei. We also discuss about uncertainties at the extraction of such relevant physical quantities as Γ n /Γ tot ratio or also excitation functions from the experimental results due to the not always realistic assumptions in the treatment and analysis of the detected events. This procedure can lead to large ambiguity when the complete fusion process is strongly hindered or when the fast fission contribution is large. We emphasize that a refined multiparameter model of the reaction dynamics as well as a more detailed and checked data analysis are strongly needed in heavy-ion collisions.

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“…The decay of DNS without reaching the equilibrated shape of the CN formation [7,10,11] is called quasifission process and its cross section is obtained by the following expression…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Real causes of apparent abnormal results in heavy ion reactions

Mandaglio

Nasirov

Anastasi

et al. 2015

EPJ Web of Conferences

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“…The data obtained in the very asymmetric 16 O+ 204 Pb reaction can be reproduced with the corresponding scaling of the LD fission barriers. For the less asymmetric combination with 40 Ar and for the nearly symmetric one with 124 Sn, ER cross sections calculated with these barriers at energies well above the fusion barrier, exceed the experimental ones by a factor of 4 and 8, respectively. At sub-barrier energies, we obtain even stronger fusion suppression using barrier-passing cross sections corresponding to the capture cross sections fitted.…”

Section: Er Production In the Vicinity Of N=126 Shellmentioning

confidence: 71%

Fusion probability and survivability in estimates of heaviest nuclei production

Sagaidak

2012

EPJ Web of Conferences

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Abstract. Production of the heavy and heaviest nuclei (from Po to the region of superheavy elements close to Z=114 and N=184) in fusion-evaporation reactions induced by heavy ions has been considered in a systematic way within the framework of the barrier-passing model coupled with the statistical model (SM) of de-excitation of a compound nucleus (CN). Excitation functions for fission and evaporation residues (ER) measured in very asymmetric combinations can be described rather well. One can scale and fix macroscopic (liquid-drop) fission barriers for nuclei involved in the calculation of survivability with SM. In less asymmetric combinations, effects of fusion suppression caused by quasi-fission (QF) are starting to appear in the entrance channel of reactions. QF effects could be semi-empirically taken into account using fusion probabilities deduced as the ratio of measured ER cross sections to the ones obtained in the assumption of absence of the fusion suppression in corresponding reactions. SM parameters (fission barriers) obtained at the analysis of a very asymmetric combination leading to the production of (nearly) the same CN should be used for this evaluation.

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