Joel M. Moss

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Joel M. Moss is an American experimental nuclear physicist .

Moss graduated from Fort Hayes State University with a bachelor's degree in 1964 and received a PhD in nuclear chemistry from the University of California, Berkeley , in 1969 . From 1969 to 1971 he was at the nuclear research center in Saclay and then until 1973 instructor at the University of Minnesota . From 1973 he was assistant professor and from 1978 associate professor at Texas A&M University , where he investigated giant resonances of atomic nuclei with the local cyclotron and developed the technique of focal plane polarimetry (focal plane polarimetry) on magnetic spectrometers . In 1979 he went to the Los Alamos National Laboratory , where he developed and applied his technique of focal plane polarimetry at LAMPF (and also at the cyclotron at Indiana University). For example, he used it to search (unsuccessfully) for collective pion excitations in nuclei in spin-sensitive experiments. From 1984 to 1987 he was group leader and then until 1993 deputy head of the Medium Energy Physics department and from 1988 to 1990 program director for nuclear and particle physics of the laboratory.

In 1986 he became the spokesman for the E 772 experiment at Fermilab , which studied dimyon production ( i.e. of muon pairs via a Drell-Yan process and from charmonium decays) in high-energy proton-nucleus collisions with 800 GeV protons at the Tevatron . In particular, they received information about the antiquark distribution of sea ​​quarks in the nucleons in the nucleus and were able to study their dependence on the mass number of the nucleus. There was no mass number-dependent modification (i.e. a different behavior of nucleons in nuclei than that of free nucleons), as was observed in the EMC effect of deep inelastic lepton scattering on nuclei in 1983 . That was contrary to the expectations from the explanation of the EMC effect from pion effects (increased occurrence of antiquarks) in cores. E 772 could not find any such antiquark reinforcement. In addition, they gained evidence of Charmonium and Charm formation in nuclei from the Dimyon production.

He was also involved in experiments on deep inelastic scattering on nuclei and nucleons at the Fermilab. He is also involved in experiments on the PHENIX detector of the RHIC heavy ion accelerator , to study high-energy nuclear collisions and the spin structure of the nucleon.

In 1998 he received the Tom W. Bonner Prize for Nuclear Physics . He is a fellow of the American Physical Society .

Web links

Individual evidence

  1. ^ Career data American Men and Women of Science , Thomson Gale 2004
  2. ↑ Quark-antiquark annihilation and subsequent pair generation via intermediate photon
  3. ↑ Preprints of the E 772 collaboration on the LANL
personal data
SURNAME Moss, Joel M.
BRIEF DESCRIPTION American experimental nuclear physicist
DATE OF BIRTH 20th century