Direct experimental evidence for very long fission times of super-heavy elements

M. Morjean; J. L. Charvet; A. Chbihi; M. Chevallier; C. Cohen; D. Dauvergne; R. Dayras; A. Drouart; J. D. Frankland; D. Jacquet; R. Kirsch; M. Laget; P. Lautesse; A. L'Hoir; A. Marchix; L. Nalpas; M. Parlog; C. Ray; C. Schmitt; C. Stodel; L. Tassan-Got; C. Volant

doi:10.1140/epjd/e2007-00134-5

EPJ

Direct experimental evidence for very long fission times of super-heavy elements

M. Morjean¹^a, J. L. Charvet², A. Chbihi¹, M. Chevallier³, C. Cohen⁴, D. Dauvergne³, R. Dayras², A. Drouart², J. D. Frankland¹, D. Jacquet⁵, R. Kirsch³, M. Laget⁵, P. Lautesse³, A. L'Hoir⁴, A. Marchix¹, L. Nalpas², M. Parlog¹, C. Ray³, C. Schmitt³, C. Stodel¹, L. Tassan-Got⁵ and C. Volant²

¹ GANIL, DSM/CEA, IN2P3/CNRS, BP 55027, 14076 Caen Cedex 5, France
² DSM/DAPNIA/SPhN, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
³ IPNL, IN2P3/CNRS, Université Lyon 1, 4 rue E. Fermi, 69622 Villeurbanne Cedex, France
⁴ INSP, Université Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
⁵ IPN Orsay, BP 1, 91406 Orsay Cedex, France

Corresponding author: ^a morjean@ganil.fr

Received: 22 September 2006
Revised: 1 February 2007
Published online: 28 March 2007

Abstract

The blocking technique in single crystals has been applied to reaction time measurements for the ²³⁸U + Ge system at 6.1 MeV/nucleon. Backed up with a reaction mechanism analysis using the INDRA 4π detector, it provides a direct experimental evidence for Z = 124 compound nuclei living longer than 10^-18 s, indicating thus very high fission barriers for this element.

PACS: 61.85.+p – Channeling phenomena (blocking, energy loss, etc.) / 25.70.Jj – Fusion and fusion-fission reactions

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EPJ

Direct experimental evidence for very long fission times of super-heavy elements

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