INTERNATIONAL WORKSHOP GRAVITY, SPECTROSCOPY AND INTERFERENCE WITH ATOMS AND NEUTRONS

University of Turku is organizing an open workshop of the GRASIAN collaboration on 27.08 – 28.08.2026.

The worksshop venue is Ruissalo Spa and hotel located in Ruissalo island of Turku archipelago: www.ruissalospa.fi

tentative Program

Thursday, 27 August

8:00-8:15      Opening                                      S. Vasiliev and V. Nesvizhevsky

8:15-8:45      Neutrons/WGS                         V. Nesvizhevsky, ILL

Gravitational and other shifts of whispering-gallery and gravitational state interference patterns of light neutral particles

8:45-9:15      Neutrons/WGS                          J. Pioquinto, ILL

Search for a new spin-dependent short-range interaction at the nanometer scale using Whispering Gallery States of neutrons

9:15-9:45      Neutrons/WGS                          K. Schreiner, ILL

Magnetic shift of the neutron whispering gallery

9:45-10:15      Neutrons/WGS                          S. Baessler, ILL

Measurement of WGS with neutrons at SNS

10:15-10:45                                Coffee break

10:45-11:15       Quantum reflection/online    S. Reynaud, LKB

Isotope effect for quantum reflection of Hydrogen and Deuterium on Silicon

11:15-11-45      Quantum reflection                   A. Voronin, ILL

Effects of dielectric charges on quantum reflection from Silicon

11:45-12:15       Quantum Reflection               V. Kletzl-Teuffenbach, MBI

QR experiments at MBI

12:15-13:30                      Lunch break

13:30-14-00       Positronium                              E. Javary, ETH

Updates on experiments with positronium

14:00-14:30       H-beams                                    E. Bera, LKB

Progress on the Zeeman decelerator

14:30-15:00       Anti-H                                        E. Widmann, MBI

Antihydrogen beam for hyperfine spectroscopy – status

15:00-15:30     Atom-surface Int.                       G. Lach, Warsaw University

Nuclear recoil correction to atom-surface interactions

15:30-16:00                                Coffee break

16:00-16:30                                                              A. Voronin

Fresnel diffraction in X-ray whispering gallery

16:30-17:00       Magnetic trapping                    A. Semakin, UTU

Experiments on magnetic trapping at Turku

17:30-20:00      Tour in the lab in Turku/optional

 

Friday 28 August

8:00-8:30        Tritium                                         C. Rodenbeck, TLK

KAMATE: Recent results and future plans

8:30-9:00        Tritium                                          D. Frese, TLK

Characterization of atomic hydrogen beams for future neutrino mass experiments

9:00-9:30      Spectroscopy                                T. Kiilerich, UTU

Towards precision 1S-2S spectroscopy of magnetically trapped H at Turku

9:30-10:00    Cold atom sources                       J. Ahokas, UTU

Developments of cold sources of D and T

10:00-10:30                                  Coffee break

10:30-11:00      Project 8                                        B. Jones, U Manchester

Tritium microphysics

11:00-11:20      Project 8                                        A. Negi, U Manchester

Magnetic evaporative cooling of tritium

11:20-11:50     Project 8                                         A. Lindman, LBNL

Magnetic guiding of T

11:50-12:10      Project 8                                        P. Harmston, U Illinois

A cryogenic atomic tritium cell for polarization spectroscopy and chemical potential measurements

12:10-13:30                                    Lunch break

13:30-14:00      Tritium/online                             T. Lasserre, MPIK Heidelberg

Bound-state beta decay of Tritium and neutrino mass

14:00-14:30      Spectroscopy                                 P. Crivelli, ETH

CW spectroscopy of H at ETH

14:30-15:00     Anti-H                                              C. Regenfus, ETH

The GBAR experiment and towards a measurement of
the 2S1/2-2P1/2 Lamb shift of antihydrogen atoms

15:00-15:30      Spectroscopy                                  S. Vasiliev, UTU

Optical spectroscopy with D and T

15:30-16:00                                   Coffee break

16:00-16:30     Quantum Reflection                      M. Federer, MBI

Future of QR at MBI, 2D detection of H

16:30-18:30                                                               GRASIAN collaboration closed session

18:30                                      Dinner

19:30 – Continue discussions (in sauna or on the beach)

 

List of confirmed participants, 24.7.2026

ILL :

  • Alexei Voronin
  • Jason Pioquinto
  • Stefan Baessler
  • Valery Nesvizhevsky

MBI/ LKB

  • Katharina Schreiner
  • Elio Bera
  • Eberhard Widmann
  • V. Kletzl-Teuffenbach
  • Francois Nez
  • Pauline Yzombard
  • M. Federer
  • S. Reynaud/online

ETH Zurich:

  • Paolo Crivelli
  • Evans Javary
  • Christian Regenfus

UTU:

  • Aleksei Semakin
  • Sergey Vasiliev
  • Tom Kiilerich
  • Janne Ahokas
  • Jarmo Wallenius

TLK

  • Caroline Rodenbeck
  • David Frese

Project 8

  • Benjamin Jones, University of Manchester
  • Akishima Negi, University of Manchester
  • Alec Lindman, LBNL, USA
  • Paul Harmston, University of Illinois Urbana-Champaign

University of Warsaw

  • Grzegorz Lach

Max-Planck Institute for Nuclear Physics, Heidelberg

  • Thierry Lasserre/online

Workshop fee

All participants are requested to pay for their Accommodation and Conference package :

Accommodation: 111 €/night including all taxes. This includes a single room accommodation, buffet breakfast, access to sauna and pool area as well as gym. Double room accommodation is also available with reduced price per person. Please, inform us if you come with an accompanying person, or wish to share room with some other participant.

Conference package: 37.80 €/day for Thursday and Friday. This includes conference room + soup&salad lunch + coffee breaks;

Travel instructions

Fly to Helsinki airport, then go to the bus or train station following the signs. Buses and trains go to Turku approximately every second hour. You may find the bus timetable and purchase the ticket  online (https://www.matkahuolto.fi/en) or entering the bus from the driver (slightly more expensive). For train schedule and tickets, please check the site: vr.fi. There is a city bus connection from the center of Turku/bus/train stations to the Ruissalo hotel, bus lines 28 and 28A. More information is available at the Ruissalo Spa site.  Please, inform us about your flight schedule and we will assist in transportation from Turku bus/train station to the workshop venue.