Dissertation: New experimental data for advancing nuclear models (Joukainen)
During the experimental phase of Henna Joukainen’s doctoral thesis, the MARA recoil separator, gamma-ray detectors and particle detectors at the Accelerator Laboratory of the Ģֱ were used simultaneously. Joukainen presents her study of the excited states of three isotopes – arsenic-66, tungsten-165, and tungsten-169 – and the testing of a new detector for recoil-beta tagging.
“This new data is beneficial for the development of nuclear models and for understanding the phenomena that happen at the nuclear level,” says Henna Joukainen from the Ģֱ.
Approach to studying nuclei using beta decay
Joukainen also detected the characteristic beta decay of the nuclei created in her experiments. Beta decay is more difficult to detect than the isomers mentioned above, because the beta energy spectra are continuous. However, the nucleus of interest can sometimes be distinguished from the other beta-decaying species in the experiment.
“For this method, a new detector called Tuike has been developed,” says Joukainen. The development and building of this device are also presented in her dissertation.
Henna Joukainen (M.Sc.) defends her doctoral dissertation “Study of Properties and States Above the Isomers in 165,169W and 66As and Development of the Plastic-Scintillator Detector Tuike” on 21 May 2025 at 12.00 in lecture hall FYS1 on Ylistönrinne. Her opponent is Helena Albers (GSI Helmholtzzentrum für Schwerionenforschung) and the custos is staff scientist Jan Sarén (Ģֱ). The language of the dissertation is English.
The event will be streamed live online:
The dissertation “Study of Properties and States Above the Isomers in 165,169W and 66As and Development of the Plastic-Scintillator Detector Tuike” is available in the JYX digital archive:
