Fission yield studies with SPIG-equipped IGISOL : a novel method for nuclear data measurements
This thesis work consists of two sections. In the first section, the development of a so-called Laser Ion Source Trap (LIST) device is described. The LIST device is based on a double SPIG (SextuPole Ion Guide) system, providing the possibility to improve the elemental selectivity of the IGISOL method via highly discriminative laser ionization occurring outside the ion guide. The improved selectivity enables the production of isotopically pure beams. The double SPIG can be used without laser ionization and replaces the conventional skimmer electrode. In this work, the SPIG is compared to the skimmer and is shown to remarkably improve both the efficiency and beam quality of the IGISOL facility. The second section introduces a novel method for isotopic fission yield measurements. Accurate fission product yield data are important in many fields of physics. Previous experimental techniques are either limited to certain mass regions of the fission products, or lead to inaccurate and/or time consuming yield deduction. The technique described in this work is a successful combination of the universal IGISOL method and an unambiguous isobaric purification of the JYFLTRAP facility. This combination is able to provide pure samples of almost any isotope produced in fission. These samples are directly counted using a highly sensitive MCP - detector, significantly shortening the measurement time as compared to traditional detection methods such as a gamma-spectroscopy. ...
PublisherUniversity of Jyväskylä
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Gorelov, Dmitry (University of Jyväskylä, 2015)there is no unique model or theory which describes all aspects of this phenomenon. Experimental measurements of nuclear fission product distributions still remains quite a challenging task for modern technologies. In ...
First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments Rakopoulos, V.; Lantz, M.; Solders, A.; Al-Adili, A.; Mattera, A.; Canete, Laetitia; Eronen, Tommi; Gorelov, Dmitry; Jokinen, Ari; Kankainen, Anu; Kolhinen, Veli; Moore, Iain; Nesterenko, Dmitrii; Penttilä, Heikki; Pohjalainen, Ilkka; Rinta-Antila, Sami; Simutkin, V.; Vilén, Markus; Voss, Annika; Pomp, S. (American Physical Society, 2018)We report the first experimental determination of independent isomeric yield ratios using direct ion counting with a Penning trap, which offered such a high resolution in mass that isomeric states could be separated. The ...
Pomp, Stephan; Mattera, Andrea; Rakopoulos, Vasileios; Al-Adili, Ali; Lantz, Mattias; Solders, Andreas; Jansson, Kaj; Prokofiev, Alexander; Eronen, Tommi; Gorelov, Dmitry; Jokinen, Ari; Kankainen, Anu; Moore, Iain; Penttilä, Heikki; Rinta-Antila, Sami (EDP Sciences, 2018)Data on fission yields and isomeric yield ratios (IYR) are tools to study the fission process, in particular the generation of angular momentum. We use the IGISOL facility with the Penning trap JYFLTRAP in Jyväskylä, ...
Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique Rakopoulos, V.; Lantz, M.; Pomp, S.; Solders, A.; Al-Adili, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kankainen, Anu; Mattera, A.; Moore, Iain; Nesterenko, Dmitrii; Reponen, Mikael; Rinta-Antila, Sami; de Roubin, Antoine; Vilén, Markus; Österlund, M.; Penttilä, Heikki (American Physical Society, 2019)Isomeric yield ratios for the odd-A isotopes of 119–127Cd and 119–127In from 25-MeV proton-induced fission on natural uranium have been measured at the JYFLTRAP double Penning trap, by employing the phase-imaging ...
Gamma rays as probe of fission and quasi-fission dynamics in the reaction 32S + 197Au near the Coulomb barrier Pulcini, A.; Vardaci, E.; Kozulin, E.; Ashaduzzaman, M.; Borcea, C.; Bracco, A.; Brambilla, S.; Calinescu, S.; Camera, F.; Ciemala, M.; Canditiis, B. de; Dorvaux, O.; Harca, I. M.; Itkis, I.; Kirakosyan, V. V.; Knyazheva, G.; Kozulina, N.; Kolesov, I. V.; La Rana, G.; Maj, A.; Matea, I.; Novikov, K.; Petrone, C.; Quero, D.; Rath, P.; Saveleva, E.; Schmitt, C.; Sposito, G.; Stezowski, O.; Trzaska, Wladyslaw; Wilson, J. (IOP Publishing, 2018)Compound nucleus fission and quasi-fission are both binary decay channels whose common properties make the experimental separation between them difficult. A way to achieve this separation could be to probe the angular ...