Status | Confirmed |
Seminar Series | NUC-THEO |
Subjects | nucl-th |
Date | Thursday 14 June 2018 |
Time | 11:30 |
Institute | IPN |
Seminar Room | Bâtiment 100, Salle A015 |
Speaker's Last Name | Delion |
Speaker's First Name | D.s. |
Speaker's Email Address | |
Speaker's Institution | Horia Hulubei National Institute of Physics and Nuclear Engineering |
Title | Alpha clustering in strong electromagnetic fields |
Abstract | 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). |
arXiv Preprint Number | |
Comments | $ $ |
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