Topical Group on Few-Body Systems & Multiparticle Dynamics

Our mission: To advocate, promote, and advance research on few-body systems.

Who we are: The APS Topical Group on Few-Body Systems and Multiparticle Dynamics was formed in January, 1985. We are an umbrella organization of atomic, molecular, nuclear, particle, and mathematical physicists, as well as quantum chemists, who are interested in the dynamics of “simple” systems. Such systems have relatively few degrees of freedom at some energy scale, and their study provides significant information about the dynamics of systems in a given area of physics, as well as identifies features common to systems in a variety of different sub-disciplines. Because we are an interdisciplinary group, many of our sessions at APS meetings are held jointly with other Groups and Divisions and feature specific “themes” from different fields.

What we do:

  • Offer travel grants for students and postdoctoral researchers who are presenting their work at the APS April and DAMOP meetings.
  • Organize and sponsor workshops and conferences (or portions thereof), and work to ensure representation of few-body topics at relevant workshops and conferences.
  • Nominate APS Fellows whose accomplishments are centered around few-body topics.
  • Communicate with and inform GFB members through regular emails and an annual newsletter.

How to join: To join any topical group, American Physical Society (APS) membership is required. All physicists who are APS members and who have an interest in few-body problems are encouraged to sign up for the Topical Group. Those who are not members are encouraged to join APS.


News & Announcements

GFB Travel Award

Congratulations to Qingze Guan on winning the 2019 GFB Travel Award! Qingze recently received his Ph.D. from the University of Oklahoma under the supervision of Prof. Doerte Blume. He presented an invited talk on May 30 at the 2019 DAMOP Meeting in Milwaukee entitled "Density oscillations induced by individual ultracold two-body collision". Qingze is continuing his research with Prof. Blume as a postdoc at the University of Oklahoma. More information about the GFB Travel Award can be found at:

APS April Meeting

The GFB sponsored two invited sessions at the 2019 APS April Meeting in Denver jointly with the Division of Nuclear Physics. The first session was held on April 14 on the topic of "Short-Range Correlations in Few-Body Systems". The invited speakers and talk titles were Noemi Rocco, "Ab-initio calculations of scattering reactions"; Diego Lonardoni, "Quantum Monte Carlo calculations of light nuclei using local chiral interactions"; and Reynier Cruz Torres, "Probing correlations in A=3 systems using electron scattering". The second session was held on April 16 on the topic of "Frontiers of Nuclear Few-Body Reactions". The invited speakers and talk titles were Grigory Rogachev, "Clustering in Exotic Nuclei"; Sofia Quaglioni, "Ab initio calculations of few-body reactions"; and Alex Zylstra, "Studying few-body fusion reactions with laser-generated high-energy-density plasmas".

Vitaly Efimov and Rudolf Grimm win inaugural Faddeev Medal

The Faddeev medal was inaugurated in 2016 by the Topical Group on Few-Body Systems & Multiparticle Dynamics (GFB) of the American Physical Society and the European Research Committee on Few-Body Problems in Physics (ERCFBP) to recognize distinguished achievement in Few-Body Physics. It is named in honor of our distinguished colleague Ludwig Faddeev. The medal is awarded every three years to a scientist (or scientists) who advanced the field of few-body physics significantly — either through ground-breaking research or due to crucial progress achieved over the course of a career.

An international panel of experts, chaired by G. Orlandini (Trento), has selected the winners of the 2018 award. They are:

Vitaly Efimov:For the theoretical discovery of a series of weakly-bound three-body quantum states known as Efimov states.

Rudolf Grimm: "In recognition of his ground-breaking experiments confirming the Efimov effect."

The prize consists of US$1250 for each of the winners, a medal, and an invitation to the 22nd International Conference on Few-body Problems in Physics in Caen, France, next July, to participate in a special session there, devoted to the presentation of the medals. (For more details on FB22, please see

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APS Fellowship Awarded Through GFB
APS just announced the newly elected 2017 APS Fellows. One fellowship has been awarded through GFB. Our new fellow is:

Roxanne P. Springer (Duke University) "For significant contributions to understanding the low-energy properties of hadrons, nuclei, and especially for pioneering contributions to the use of low-energy effective field theory techniques in the quest to identify and understand the fundamental symmetries of nature."

Congratulations to Roxanne!

GFB Welcomes New Members to its Leadership Team
The tallying of ballots from the recent election has been completed. The successful candidates are:

  • Vice-Chair: Jose D'Incao - JILA, University of Colorado and NIST
  • Executive Committee: William Detmold - MIT; Wes Campbell - UCLA, Los Angeles

Please join us in welcoming Jose, Will, and Wes to the GFB Leadership Team!

Ludwig Faddeev Dies After a Long Illness
Russian news sources announced that the Russian Mathematical Physicist, Ludwig Faddeev, died on Sunday February 26 "after a long illness".
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Faddeev Medal Announcement
GFB and the European Research Committee on Few Body Problems in Physics (ERCFBP) announce a new award to recognize distinguished achievement in Few-Body Physics, the Faddeev medal, named in honor of our outstanding colleague Ludwig Faddeev.
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Few-Body Physics in the News

Here we have collected links to recent articles which present forefront research on few-body dynamics in arenas including atoms & molecules, nuclei, and hadrons detected at the LHC.

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Upcoming Meetings

March Meeting 2021
March 15-19, 2021

APS April Meeting 2021
April 17-20, 2021

March Meeting 2022
February 28-March 4, 2022

APS April Meeting 2022
April 23-26, 2022

More Meeting Information

View APS Meeting Calendar

Nominees and award and office holders are expected to meet standards of professional conduct and integrity as described in the APS Ethics Guidelines. Violations of these standards may disqualify people from consideration or lead to revocation of honors or removal from office.