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Formation of Super-Heavy Elements: Uncertainties in Theoretical Modeling

Abstract : One of the biggest challenges in nuclear physics is to synthesize new super-heavy elements (SHE)and thus to extend the periodic table. It is commonly known that SHE cannot be found in nature.According the shell model, they have been predicted to exist thanks to a regain of stability.Experimentally, by making use of heavy-ion collisions, SHE can be artificially produced inlaboratories. However, owing to extremely low formation probabilities, such experiments becomeincreasingly difficult. More powerful experimental set-ups are therefore needed to overcome thisissue. For instance, within the promising project SPIRAL2 at GANIL, the study of super-heavyelements has been selected as one of priority research subjects for the coming years.On the other hand, the complete reaction mechanism for the synthesis of super-heavy elements stillremains unclear. One of the most serious problems is the so-called fusion hindrance phenomenonthat is well understood only qualitatively but not quantitatively. Many theoretical attempts havebeen made over the past few decades. However, there exist large discrepancies in the predictionsprovided by different theoretical models. More concretely, this might be due to either uncertaintiesin model parameters or models themselves. Hence, a natural question arises: How to clarify bothuncertainty contributions so as to constrain the fusion models?Using the Monte-Carlo method, we tried to estimate the uncertainties related to the parametersentering the model, in order to investigate whether they can explain such discrepancies observedamong various fusion models. Here, we mainly focused on the last phase of the reaction, namelystatistical decay of the compound nucleus, by means of the KEWPIE2 code.Moreover, we only have access to very few and poor experimental data. Another interestingquestion needed to be addressed is that, what can we learn about model parameters fromexperimental data? As an inverse problem, Bayesian statistics would be a perfect candidate. Iwill also give a brief introduction to this theory as well as some simple applications. Our recentwork will be presented at the end of this talk.
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http://hal.in2p3.fr/in2p3-01090446
Contributor : Michel Lion <>
Submitted on : Wednesday, December 3, 2014 - 3:15:20 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:27 PM

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  • HAL Id : in2p3-01090446, version 1

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H. Lu, D. Boilley. Formation of Super-Heavy Elements: Uncertainties in Theoretical Modeling. Rencontres Jeunes Chercheurs 2014, Nov 2014, Strasbourg, France. ⟨in2p3-01090446⟩

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