Wikipedia

Draft:Arne Johnson

  • Comment: The author should disclose their COI before resubmitting. DoubleGrazing (talk) 09:54, 30 December 2023 (UTC)
  • Comment: Possibly notable, but the sources aren't sufficient for satisfying WP:GNG, and it's not entirely clear whether and how this satisfies WP:NACADEMIC (I'm thinking criteria #1 and/or #7 look likely candidates, but we would need to see clear evidence to support that). DoubleGrazing (talk) 09:54, 30 December 2023 (UTC)
  • Comment: Insufficient secondary sources OLI 05:18, 17 September 2023 (UTC)
This page is about the nuclear physicist. For the demonic possession trial, see Trial of Arne Cheyenne Johnson.

Arne Claes Olof Johnson (1944-2023) was a Swedish nuclear physicist most known for the discovery of the 'backbend',[1][2] a phenomenon described in ref.[3] Johnson became instrumental in the development of large detector arrays like Nordball[4] and EUROBALL.[5] He was professor in nuclear physics at the KTH Royal Institute of Technology.[6]

Bibliography edit

Arne Johnson studied engineering physics at KTH Royal Institute of Technology from 1963 to 1967. After completion, he started his PhD in nuclear spectroscopy under supervision of Sven Hjorth and Hans Ryde. He discovered irregularities in the spectrum of 160Dy (Dysprosium)[3] during his PhD research. The electronic engineer Jozef Sztarkier developed an electronic circuit such that the following experiment could indeed prove that the irregularity belonged to the same structure in 160Dy.[1] Further experiments revealed even stronger irregularities in the spectrum of the nucleus of 162Er (Erbium) where the figure of the moment of inertia shows a 'backbend'.[2][3] The irregularity was interpreted at that time as a phase transition[3] which also became the title of Arne Johnson's thesis 1973, "Evidence for phase transitions in deformed nuclei".[7]

Together with the theoretical nuclear physicist Zdzisław Szymański, the emerging field of nuclear rotational states (see also rotational spectroscopy) was described in a review paper.[8] Arne Johnson received the academic title of a Docent in 1974 (see Academic ranks in Sweden). Following international visits to many leading laboratories in both Europe and the US (including the Niels Bohr Institute, Denmark, and Daresbury Laboratory) he was appointed adjoint professor at KTH Royal Institute of Technology in 1986 and full professor in nuclear physics in 1997.[6] He was honoured with the Borelius medal for his achievements in physics and as dean of the engineering science faculty at KTH.[9]

During his military service at the FOA (Swedish National Defence Research Institute) 1977-1978, he was responsible in developing a Gamma-ray spectrometer for radioactive Xenon leaking from underground bomb test. Later, he initiated with Nordic nuclear physicist the development of the advanced detector system Nordball[4] and became the Swedish representative for the European detector system EUROBALL.[5]

References edit

  1. ^ a b Johnson, A.; Ryde, H.; Sztarkier, J. (1971). "Evidence for a "singularity" in the nuclear rotational band structure". Physics Letters B. 34 (7): 605–608. Bibcode:1971PhLB...34..605J. doi:10.1016/0370-2693(71)90150-X – via elsevier science direct.
  2. ^ a b Johnson, A.; Ryde, H.; Hjorth, S.A. (1972). "Nuclear moment of inertia at high rotational frequencies". Nuclear Physics A. 179 (3): 753–768. Bibcode:1972NuPhA.179..753J. doi:10.1016/0375-9474(72)90617-3.
  3. ^ a b c d Wyss, R.; Riley, M. A. (2022-04-03). "Fifty Years of Backbending". Nuclear Physics News. 32 (2): 16–20. Bibcode:2022NPNew..32b..16W. doi:10.1080/10619127.2022.2063000. ISSN 1061-9127.
  4. ^ a b Herskind, Bent (1986). "The NORDBALL — A multidetector system for the study of nuclear structure". Nuclear Physics A. 447: 395–412. Bibcode:1986NuPhA.447..395H. doi:10.1016/0375-9474(86)90619-6.
  5. ^ a b Simpson, J. (1997). "The Euroball Spectrometer". Zeitschrift für Physik a Hadrons and nuclei. 358 (2): 139–143. Bibcode:1997ZPhyA.358..139S. doi:10.1007/s002180050290. ISSN 0939-7922. S2CID 124091023.
  6. ^ a b Cederwall, Bo (Oct 30, 2023). "In memoriam Arne Johnson". KTH. Retrieved 2023-12-30.
  7. ^ Harvard, Johnson, Arne (1973). Evidence for phase transitions in deformed nuclei. Diss. (sammanfattning) Stockholm : Tekn.högsk.
  8. ^ Johnson, A.; Szymański, Z. (1973). "Nuclear rotation at high angular velocities". Physics Reports. 7 (4): 182–222. Bibcode:1973PhR.....7..182J. doi:10.1016/0370-1573(73)90012-4.
  9. ^ "Arne Johnson prisas för fysikinsatser" (in Swedish). KTH Royal Institute of Technology. Retrieved 30 December 2023.
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