Read more about my projects here (Norwegian):
Fission: what happens when heavy nuclei split?
In 1938, Otto Hahn and Fritz Strassmann stumbled upon something odd. They had bombarded the heavy nucleus uranium with neutrons, maybe expecting to find neighbouring elements among the reaction products. Instead, they found barium; a nucleus about half the mass of the original uranium, and far out of reach for any known nuclear reaction.
Over 80 years have passed since these findings were published, and we now know that Otto Hahn and Fritz Strassmann had induced fission in uranium. In this violent process, the nucleus rips apart and forms two smaller fission fragments while enormous amounts of energy is emitted. (Approximately a million times as much as in any chemical reaction!)
With the possibility of this huge energy release, fission was quickly applied in both energy production and weapons. Therefore, it might be surprising to hear that after 80 years of research, we are still yet to find a complete description of the fission process. Fission is a many-body quantum mechanical problem and is exceptionally difficult to describe - and thus also incredible fascinating to study.
I'm working with a small piece of the complicated fission puzzle, and I study the photons emitted in the fission process. We cannot see directly what happens in fission as the heavy nucleus splits, but the emitted photons carry information about the excitation energy and angular momentum of the system. By trying to understand the radiated fission photons, we hope to gain new insights into the mystery that is the fission process.
Together with colleagues from Norway and abroad, I take part in conducting experiments to measure these fission photons, at the same time as we test to see if the state-of-the-art fission models can reproduce the experimental results. I thus work in the border between experiment and theory, which I think is amazing - I both get insights into the best fission models at the same time as I can propose new experiments to further push the border of our knowledge.
Do you think this sounds exciting? Feel free to send me a mail or drop by my office!
B.Sc University of Oslo: Physics, Astronomy and Meteorology, 2014-2017
M.Sc University of Oslo: Nuclear Physics, 2017-2019
PhD Student University of Oslo: Nuclear Physics, 2019 -
FYS4580, Lecturer, fall 2019 and 2021
FYS3500, Colloquium teacher, spring 2020, 2021
Häfner, G.; Lozeva, R; Naïdja, H.; Lebois, M.; Jovančević, N. & Thisse, D. [Show all 72 contributors for this article] (2021). First lifetime investigations of iodine isotopes: The quest for collectivity. Physical Review C. ISSN 2469-9985. 104(1). doi: 10.1103/PhysRevC.104.014316. Full text in Research Archive
Gjestvang, Dorthea; Siem, Sunniva; Zeiser, Fabio; Randrup, Jørgen; Vogt, Ramona & Bello Garrote, Frank Leonel [Show all 20 contributors for this article] (2021). The study of prompt fission γ rays at the Oslo Cyclotron Laboratory. The European Physical Journal Conferences. ISSN 2101-6275. doi: 10.1051/epjconf/202125600005. Full text in Research Archive
Markova, Maria; von Neumann-Cosel, Neumann-Cosel; Larsen, A.C.; Bassauer, S.; Görgen, A. & Guttormsen, Magne Sveen [Show all 25 contributors for this article] (2021). Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance. Physical Review Letters. ISSN 0031-9007. 127(18). doi: 10.1103/PhysRevLett.127.182501. Full text in Research Archive
Häfner, G.; Naïdja, H.; Lebois, M.; Jovancevic, N.; Thisse, D. & Etasse, D [Show all 72 contributors for this article] (2021). Spectroscopy and lifetime measurements in 134,136,138Te isotopes and implications for the nuclear structure beyond N = 82. Physical Review C. ISSN 2469-9985. doi: 10.1103/PhysRevC.103.034317. Full text in Research Archive
Gjestvang, Dorthea; Siem, Sunniva; Zeiser, Fabio; Randrup, Jørgen; Vogt, Ramona & Wilson, Jonathan Nicholas [Show all 19 contributors for this article] (2021). Excitation energy dependence of prompt fission γ-ray emission from 241Pu*. Physical Review C. ISSN 2469-9985. 103(3). doi: 10.1103/PhysRevC.103.034609. Full text in Research Archive Show summary
Gerst, RB; Blazhev, A.; Warr, N.; Wilson, J. N.; Lebois, M & Jovančević, Nikola [Show all 50 contributors for this article] (2020). Prompt and delayed gamma spectroscopy of neutron-rich Kr94 and observation of a new isomer. Physical Review C. ISSN 2469-9985. doi: 10.1103/physrevc.102.064323. Full text in Research Archive
Gjestvang, Dorthea (2022). "... men hva med Tsjernobyl?".
Gjestvang, Dorthea (2021). Excitation energy dependence of prompt fission γ-ray emission from 241Pu∗ .
Gjestvang, Dorthea (2021). Spinnville fisjonsfragmenter. Fra Fysikkens Verden. ISSN 0015-9247.