The Forty Third International Workshop on Nuclear Theory (IWNT43) will be held between 28 June (arrival day) and 4 July (departure day) 2026 in Borovets, Rila Mountains, Bulgaria.

The workshop has been organized annually, since 1980, by the Nuclear Theory Laboratory (NTL) of the Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences. Proceedings of the Workshop will be published.

The aim of the Workshop is to provide an international forum for exchange of ideas, discussions and collaboration between researchers in nuclear physics and related areas. The programme of IWNT43-2026 is expected to include the most recent theoretical and experimental advances in the field covering the following topics:

  • nuclear structure and reactions;
  • nuclear equation of state and symmetry energy;
  • symmetries and dynamics;
  • collective and intrinsic motions of nuclei;
  • exotic nuclei;
  • few-body and many-fermion systems;
  • nuclear astrophysics and related topics.

    • The workshop will be held in a hybrid format, combining talks by on-site and online participants.

    Venue:
    Lion Hotel in Borovets Resort, Rila Mountains, Bulgaria

    Transfer to the workshop venue:
    Bus transportation from Sofia to Lion Hotel Borovets departs at 6:00 p.m. on 28 June (Sunday). Departure location: parking lot in front of the former Pliska Hotel, Sofia, Blvd. "Tsarigradsko chausse" 87.
    The return bus from Lion Hotel Borovets to Sofia departs at 9:30 a.m. on 4 July (Saturday).

    Registration fees:
  • 900 EUR: standard fee for on-site participants
  • 740 EUR: reduced fee for on-site participants (for students, PhD students and accompanying persons)
  • 60 EUR: fee for online participants

    • All fees include:
  • Access to all IWNT43 sessions
  • For participants with presentations: submission of a manuscript for publication in the IWNT43 Proceedings

    • On-site fees include:
  • Full board and accommodation at Lion Hotel Borovets during the workshop
  • Transportation between Sofia and Lion Hotel Borovets
  • Social programme
  • For participants with submitted manuscripts: a hard copy of the workshop proceedings book

    • Payment procedure
    Send the following information to EVENTIS.BG (e-mail: office.prclub@gmail.com), who will handle payments and invoices:
    Names, Organization, Address, VAT number
    After receiving the invoice from EVENTIS.BG, transfer the registration fee to their bank account:
    EVENTIS BG
    Bank: Eurobank Bulgaria AD
    IBAN: BG35BPBI79391079341301
    BIC: BPBIBGSF

    Contributions:
    Both oral and poster presentations will be accepted for the workshop. Poster presenters will also be expected to give a five-minute presentation with a few slides.
    An abstract of the talk/poster (up to 1 page written in LaTeX, style: Template) should be sent to the Workshop e-mail.
    The abstracts will be collected in a booklet and available during the workshop.

    Important dates:

  • 15 April 2026: registration deadline
  • 1 May 2026: abstract submission deadline
  • 5 June 2026: registration fee payment deadline

    • If you need more information about the Workshop, do not hesitate to contact us.

    The e-mail address for correspondence is: nthlrila@gmail.com