2023
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Type Seminar
Date January 26, 2023 - 16:00
Time 16:00
Location Room 105, GANIL, Caen | France
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Laser spectroscopy developments at IGISOL

Mikael Reponen (Department of Physics, University of Jyväskylä, Finland)
 
The IGISOL facility has been actively involved in nuclear physics research for over three decades [1]. The facility utilizes beams from a K-130 cyclotron to produce low-energy ion beams for nuclear ground-state studies. The main fields of research are precision Penning-trap -based mass measurements and trap-assisted decay spectroscopy, collinear laser spectroscopy, and development of in-source laser spectroscopic methods and instruments. 
On the precision laser spectroscopy frontier, the collinear laser spectroscopy line has been upgraded with a new charge exchange cell and light collection region. The upgraded setup has been used for the spectroscopy of Pd [2], Ag [3], and in the past months, Co, and Fe. Furthermore, the CRIS method, originating from ISOLDE, CERN, has been implemented at IGISOL at the RAPTOR setup. The setup is under commissioning with successful offline demonstrations on Cu and Sn.  
The advances in Penning trap techniques have enabled ultra-sensitive Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) assisted in-source RIS [3]. This technique combined an inductively heated hot cavity catcher laser ion source. This novel technique was used to cross the N=50 shell closure near 100Sn for the first time with the charge-radii measurement of 96Ag. Since then, the measurements have been extended to 95Ag, with the immediate goal being a direct mass measurement of 94Ag. The utilization of the setup for producing proton rich Pd, Cd, In and Sn is also being investigated.  
In addition, two externally operated research stations utilizing optical techniques are in exist at IGISOL. The first, operated by University College London, is an atom trap aiming to create a BEC of radioactive caesium with the aim for a coherent emission via the simultaneous decay of 135mCs isomer [4]. The second is the MORA (Matter’s Origin from the RadioActivity of trapped and oriented ions) [5] setup, aiming at measuring the D correlation in nuclear beta decay utilizing trapped and laser polarized ions. 
In this presentation I will discuss the facility, recent results, near future aims related to the expansion of the hot cavity activities.  
 
[1] 
J. Äystö et al., Three decades of research using IGISOL technique at the University of Jyväskylä.: Springer, 2014. 
[2] 
S. Geldhof et al., “Impact of Nuclear Deformation and Pairing on the Charge Radii of Palladium Isotopes,” Phys. Rev. Lett, vol. 128, no. 152501, 2022. 
[3] 
M. Reponen et al., “Evidence of a sudden increase in the nuclear size of proton-rich silver-96,” Nat. Comm., vol. 12, no. 4596, 2021. 
[4] 
L. Marmugi, P. M. Walker, and F. Renzoni, “Coherent gamma photon generation in a Bose–Einstein condensate of 135mCs,” Phys. Lett. B, vol. 777, pp. 281-285, 2018. 
[5] 
P. Delahaye et al., “The MORA project,” Hyp. Int., vol. 240, p. 63, 2019.