"RNC–KEK Joint Seminars：The 343rd RIBF Nuclear Physics Seminars

by Dr Jens Lassen (TRIUMF), Dr Milkael Reponen (University of Jyväskylä)

Monday 8 Jun 2026, 13:30 → 17:30 Asia/Tokyo

RIKEN Okouchi Hall (Wako, Saitama)

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Title: The TRIUMF-ISAC radioactive ion beam program - laser ion source(s), nuclear spin polarized beams and facility upgrades in progress

talk by Dr. Jens Lassen

The presentation will introduce the TRIUMF isotope separator and accelerator facility, which provides radioactive ion beams from an ISOL target that is irradiated by a 480MeV proton beam from the TRIUMF main cyclotron. I will give an overview of the current target-ion source capabilities and beams available as low energy or post-accelerated RIB, and experimental facilities - from precision mass-measurements to nuclear structure and beta-NMR for material and life sciences. 
TRIUMF is currently undertaking a 2026 concentrated effort to build and start operating two additional RIB target stations: one proton target station and one photo-fission target station. With these target stations and additional beam purification it is envisioned to increase the available RIB  from currently 2500h/y to 5000h/y by 2029, and to go beyond 7500h starting with the 2030 5 year funding cycle. The simultaneous delivery of up to 3 different RIB’s to experiments aims to satisfy experimenter’s needs and fully utilize the experimental facilities.
To further enhance experimental capabilities, we are undertaking upgrades to our laser ion sources, the polarizer and collinear fast beam laser spectroscopy - to couple these to high sensitivity, high resolution nuclear decay spectrometers. 
As a user-facility TRIUMF welcomes external researchers and seeks experiment proposals for high impact RIB experiments - therefore I will also be available to discuss our user program and answer questions to all aspects of our RIB and user program.

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Title: Recent results and developments from the IGISOL facility

talk by Dr. Mikael Reponen

The Ion Guide Isotope Separator On-Line (IGISOL) facility, at the University of Jyväskylä Accelerator Laboratory produces low-energy beams of nuclei far off the line of beta stability for precision studies. The isotopes are produced either via ion guide [1] or hot cavity [2] methods utilizing multi-nucleon transfer, fusion-evaporation and fission reactions. 
The facility sports a wide range of research equipment from Penning traps and MR-ToF mass spectrometers to collinear laser spectroscopy. The facility also has more specialized experiments such as an atom trap and it also houses external experiments such MORA [3] and SEASON. 
In this seminar I will highlight recent research results on collinear laser spectroscopy of Rh, mass and in-source laser spectroscopy along the N=Z line and mass measurements with the newly recommissioned JYFLTRAP. I will also discuss the recent developments [4] with an outlook for the near future.

[1] J. Ärje et al. Phys. Rev. Lett. 54, 99, (1985).
[2] M. Reponen et al., Rev. Sci. Instrum. 86, 123501 (2015).
[3] N. Goyal et al., EPJ A 61, 221 (2025).  
[4] V.A. Virtanen et al., NIMA 1072, 170186 (2025).