Statut  Confirmé 
Série  IPNTHEO 
Domaines  nuclth 
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 alphadecay 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 pocketlike potential. The alphaparticle formation probability reaches the largest value in the ”alphadecay 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 alphacluster can be determined by exciting it to the first resonant state inside the pocketlike potential, by using a quasimonochromatic gammabeam produced at the ELINP facility. The position and width of this ”alphalike pygmy” resonant state [3] can be predicted by using the alphadecay systematics to ground and excited states [4]. \\ [1] D.S. Delion and S. Ghinescu, GeigerNuttall law for nuclei in strong electromagnetic fields, Phys. Rev. Lett. 119, 202501 (2017).\newline [2] V.V. Baran and D.S. Delion, Protonneutron versus alphalike correlations above $^{100}$Sn, Phys. Rev. C 94, 034319 (2016).\newline [3] V.V. Baran and D.S. Delion, Alphalike 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). 
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