NUCLEAR CHEMISTRY?

Historically, the difference between nuclear physics and nuclear chemistry is more social and historical than physical. Traditionally, nuclear chemists have focused on three topics: (1) Highly deformed nuclei; (2) Nuclei far from the line of stability; (3) Very heavy nuclei with A near or greater than 120. The two most recent giant accelerator complexes, FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany, scheduled to become operational in 2025, and FRIB (Facility for Rare Isotope Beams) at Michigan State University in East Lansing, MI, which became operational in the summer of 2022, are both firmly situated in the realm of unique nuclear chemistry facilities, with a main stated goal of probing the nuclear equation of state in various ways.  Both FAIR and FRIB can produce separated beams of isotopes very far off the line of stability.  A very similar facility, NICA-MPD, is under construction at Dubna in Russia.


FAIR

FAIR has two linear accelerators, one for protons and one for heavy ions. It also has a collector ring for antiprotons produced in proton reactions on targets. The heavy ion beams can be directed to targets which produce highly unstable nuclear fragments from shattered beam or target nuclei, and which can then be formed into beams individually. The proton beam energy is designed to be 29 GeV, while the antiproton beam energy will be 3 GeV. The very heavy ions, depending on how many electrons are stripped off, can have energies from 3 GeV per nucleon up to 10 GeV per nucleon. Heavy ion collisions have already been extensively used to attempt to study the quark-gluon plasma at RHIC in the US, and at the LHC in Europe, but FAIR should be able to probe a different region of the nuclear equation of state than previous experiments have studied. More information.



The scientific user community of FAIR is organized in a set of experimental collaborations, which are grouped into the four scientific pillars of FAIR (in alphabetical order):

  • ★ APPA - Atomic, Plasma Physics and Applications
  • ★ CBM - Compressed Baryonic Matter
  • ★ NUSTAR - Nuclear Structure, Astrophysics and Reactions
  • ★ PANDA - Physics with High Energy Antiprotons

  • NICA-MPD

    In the 1960s, the old Soviet Union was dominating the world in manned and robotic space flight, and was making giant strides toward very high energy particle accelerators. But the breakup of the Soviet Union, and the unexpected death of the Chief Designer for the Soviet space program, resulted in Russia falling decisively behind in space and in fundamental physics. Now Russia has a state-of-the-art facility under construction at Dubna, where its largest accelerators of the past are located. The new facility is called Nucleotron-based Ion Collider Facility (NICA), with a gigantic multi-purpose detector (MPD). The accelerator is designed to deliver ion beams to fixed targets and to collide beams of ions, and also collide protons with ions. It can additionally produce beams of polarized protons and deuterons. For protons, the beam energy will be 12.6 GeV and ions will get 4.5 GeV per nucleon.  The date on which the facility will begin operations is not presently known... it was originally announced optimistically for 2022.







    FRIB