Alpha decay spectroscopy of neutron-deficient astatine, radon and francium nuclei using a gas-filled separator
Alpha particle decay properties (alpha particle energy and half-life) of neutron-deficient astatine, radon and francium isotopes are studied in this thesis. These nuclei in the close vicinity of the proton drip-line were produced using three different heavy-ion-induced fusion-evaporation reactions. The reactions were 141Pr(56Fe, xn)197-xAt, 169Tm(35Cl, xn)204-xRn, 170Yb(35Cl, xn)205-xFr and the beam particles were delivered by the K = 130 MeV heavy ion cyclotron of the Accelerator Laboratory of the Department of Physics, University of Jyvaskylii. The gas-filled recoil separator RITU was used to separate reaction products from the primary beam. The method of time and position correlated alpha particle decay chains were used for analysing the experimental data. Nine previously unpublished alpha particle transition from five different isotopes (193,194,195At, 197Rn and 200Fr) were observed in the present work. Measured alpha particle energies and half-lives are compared with the systematics of heavier isotopes and with theoretical predictions. The systematics of isomerism and shell model intruder states are also shown.
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978-951-39-9476-1Contains publications
- Artikkeli I: Leino, M., Äystö; J., Enqvist, T., Heikkinen, P., Jokinen, A., Nurmia, M., Ostrowski, A., Trzaska, W. H., Uusitalo, J., Eskola, K., Armbruster, P. and Ninov, V. (1995). Gas-filled Recoil Separator for Studies of Heavy Elements. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 99(1-4), 653-656. DOI: 10.1016/0168-583X(94)00573-7
- Artikkeli II: Leino, M., Äystö, J., Enqvist, T., Jokinen, A., Nurmia, M., Ostrowski, A., Trzaska, W. H., Uusitalo, J., Eskola, K., Armbruster, P. and Ninov, V. (1995). Research on Heavy Elements using the JYFL Gas-filled Recoil Separator RITU. Acta Physica Polonica B, 26, 309 - 322.
- Artikkeli III: Leino, M., Enqvist, T., Trzaska, W. H., Uusitalo, J., Eskola, K., Armbruster, P. and Ninov, V. Alpha decay properties of very neutron-deficient isotopes with 85
Proc. Int. Conf. on Exotic Nuclei and Atomic masses ENAM95, Arles, France, Edition Frontieres, Gif sur Yvette. - Artikkeli IV: Enqvist, T., Armbruster, P., Eskola, K., Leino, M., Ninov, V., Trzaska, W. H. and Uusitalo, J. (1996). Alpha Decay of the New Isotope 197Rn. Zeitschrift fiir Physik A, 354, 9-10. DOI: 10.1007/s002180050005
- Artikkeli V: Enqvist, T., Eskola, K., Jokinen, A., Leino, M., Trzaska, W. H., Uusitalo, J., Ninov, V. and Armbruster, P. (1996). Alpha Decay Properties of 200-202Fr. Zeitschrift fiir Physik A, 354, 1-2. DOI: 10.1007/s002180050001
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