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Statut Confirmé
Domaines nucl-th
Date Jeudi 14 Juin 2018
Heure 11:30
Institut IPN
Salle Bâtiment 100, Salle A015
Nom de l'orateur Delion
Prenom de l'orateur D.s.
Addresse email de l'orateur
Institution de l'orateur Horia Hulubei National Institute of Physics and Nuclear Engineering
Titre Alpha clustering in strong electromagnetic fields
Résumé 1) The influence of a strong laser electromagnetic field on the alpha-decay rate is ingestigated by using the Hennenberger frame of reference [1] within adiabadic and static limits. The penetrability of the Coulomb barrier becomes anisotropic for intensities corresponding to $D\sim1$, where $D$ is an adimensional parameter proportional to the square root of the intensity. As a consequence, we predict that two counters placed at zero and 90 degrees will indicate different numbers. 2) Alpha clusters are born in nuclei at low densities, the wave function being a Gaussian peaked on the nuclear surface and therefore corresponding to a local pocket-like potential. The alpha-particle formation probability reaches the largest value in the ”alpha-decay island” above $^{100}$Sn for N$\sim$Z nuclei [2] and therefore the clusters can be easier detected. We show that the shape of the alpha-cluster can be determined by exciting it to the first resonant state inside the pocket-like potential, by using a quasi-monochromatic gamma-beam produced at the ELI-NP facility. The position and width of this ”alpha-like pygmy” resonant state [3] can be predicted by using the alpha-decay systematics to ground and excited states [4]. \\ [1] D.S. Delion and S. Ghinescu, Geiger-Nuttall law for nuclei in strong electromagnetic fields, Phys. Rev. Lett. 119, 202501 (2017).\newline [2] V.V. Baran and D.S. Delion, Proton-neutron versus alpha-like correlations above $^{100}$Sn, Phys. Rev. C 94, 034319 (2016).\newline [3] V.V. Baran and D.S. Delion, Alpha-like resonances in nuclei, J. Phys. G 45, 035106 (2018).\newline [4] D.S. Delion, Universal decay rule for reduced widths, Phys. Rev. C 80, 024310 (2009).
Numéro de preprint arXiv
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  • 2018_06_14_D_Delion.pdf (305852 bytes) OPEN

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