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Stable octupole deformation in light actinides (…as predicted 8 years ago)

Stable octupole deformation in light actinides (…as predicted 8 years ago). Dimitris Petrellis. REX-. @. (source : http :// isolde.web.cern.ch/isolde/REX-ISOLDE/nine.html). Life-time measurements. 220Rn. 224Ra. Intrinsic moment. Deform. parameter. Reduced m.e.

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Stable octupole deformation in light actinides (…as predicted 8 years ago)

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  1. Stable octupole deformation in light actinides(…as predicted 8 years ago) DimitrisPetrellis

  2. REX- @ (source: http://isolde.web.cern.ch/isolde/REX-ISOLDE/nine.html) Life-time measurements 220Rn 224Ra Intrinsic moment Deform. parameter Reduced m.e.

  3. Octupole deformation • Multipole order: l=3 • Axial symmetry • Reflection Asymmetry 5- 6+ 6+ 3- 5- Energy spectra 4+ 4+ 1- 3- 2+ 2+ 1- 0+ 0+ • Low lying negative–parity • states • States of alternating • parity --> band Rotational Vibrational

  4. Analytic QuadrupoleOctupole Axially symmetric model (AQOA) 𝝓  relative presence between quadrupole and octupole

  5. Energy Staggering normalized to of each nucleus for odd L

  6. Parameter-free solution L-dependent effective potential Expand around min dependence eliminated!

  7. T-violation  EDM • Atom in its g.s. cannot have an EDM without T-violation • Neutral atom in uniform el. Fielde- displaced: cancel the el. field at the nucleus • But! Nucleus is not point-like e.g. does not see uniform el. field of e- yet is not accelerated! • If nuclear charge =/= nuclear dipole-moment density distr  average force on nucleus =0 while EDM interaction =/=0 • Schiff moment(=el dipole distr weighted by R^2) measure of this • Octupole deformed nuclei  enhanced Schiff moment

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