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Type Seminar
Date February 13, 2020 - 11:00
Time 11:00
Location Room 105 | GANIL, Caen | France
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PANDORA: a new experimental setup for measuring in-plasma nuclear β-decays of astrophysical interest

David Mascali (Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali del Sud, Catania, Italy)

Theoretical predictions [1,2] and some experiments performed on Storage Rings [3] have shown that lifetimes of beta-radionuclides can change dramatically as a function of the ionization state. PANDORA (Plasmas for Astrophysics, Nuclear Decay Observation and Radiation for Archaeometry) [4] aims at measuring, for the first time, nuclear β-decay rates in stellar-like conditions (i.e. in magnetized laboratory plasmas) for those radionuclides involved in nuclear-astrophysics processes (BBN, s-processing, CosmoChronometers, Early Solar System formation). Compact magnetic plasma traps, where plasmas reach density ne~1011-1014 cm-3, and temperatures Te~0.1-30 keV, are suitable for such studies. The decay rates can be measured as a function of the charge state distribution of the in-plasma ions. The collaboration is now designing the plasma trap able to reach the needed plasma densities, temperatures and charge states distributions, as well as the plasma diagnostics and the HpGe detectors array needed for tagging β-decays by measuring γ-rays emitted from the decayproducts. A first list of radioisotopes, including tens of physics cases of potential interest is now available. Possible physics cases include, among the others, 204Tl, 63Ni, 60Co, 171Tm, 147Pm, 85Kr, 176Lu and the pairs 187Re-187Os and 87Sr-87Rb, which play a crucial role as cosmo-clocks. Physics cases are now under evaluation in terms of lifetime measurements feasibility in a plasma trap, and first measurements will be performed on 176Lu (is it a cosmo-thermometer or a cosmo-chronometer?), 134Cs (relevant for the production of the s-only isotopes 134Ba and 136Ba) and 94Nb (relevant for the abundance of 94Mo in single or binary systems of stars).

[1] K. Takahashi and K. Yokoi, Nuclear β-decays of highly ionized heavy atoms in stellar interiors. Nuclear Physics A 404(3):578-598, August 1983. DOI: 10.1016/0375-9474(83)90277-4

[2] K. Takahashi and K. Yokoi, Beta-decay rates of highly ionized heavy atoms in stellar interiors, Atomic Data and Nuclear Data Tables. Volume 36, Issue 3, May 1987, Pages 375-409 DOI: https://doi.org/10.1016/0092-640X(87)90010-6

[3] Y. A. Litvinov and F. Bosch, Beta decay of highly charged ions 2011 Rep. Prog. Phys. 74 016301

[4] D. Mascali et al. PANDORA, a new facility for interdisciplinary in-plasma physics. European Physical Journal A 03/2017; 53(7)., DOI:10.1140/epja/i2017-12335-1


Practical information:

11h00 GANIL seminar room (105)
Coffee will be served 15mn before