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Alpha clustering in strong electromagnetic fields
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 ∼ 1, 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 differ-ent numbers.
2) Alpha clusters are born in nuclei at low densities, the wave function being a Gaussian peaked on the nuclear surface and therefore corre-sponding to a local pocket-like potential. The alpha-particle formation probability reaches the largest value in the ”alpha-decay island” above 100Sn for N∼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 res-onant 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).
[2] V.V. Baran and D.S. Delion, Proton-neutron versus alpha-like correlations above 100Sn, Phys. Rev. C 94, 034319 (2016).
[3] V.V. Baran and D.S. Delion, Alpha-like resonances in nuclei, J. Phys. G 45, 035106 (2018)
[4] D.S. Delion, Universal decay rule for reduced widths, Phys. Rev. C 80, 024310 (2009)
Doru S. Delion
Horia Hulubei National Institute
14/06/2018 à 11:30
IPN Orsay, salle A015, bâtiment 100

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Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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