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[{"key": "dc.contributor.advisor", "value": "Kankainen, Anu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Hukkanen, Marjut", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-11-18T12:16:33Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-11-18T12:16:33Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/66415", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4htien evoluution vaiheet perustuvat t\u00e4hden alkuper\u00e4iseen massaan: kevyemm\u00e4t t\u00e4hdet, joiden massa on alle kahdeksan Auringon massaa p\u00e4\u00e4tt\u00e4v\u00e4t evoluutionsa valkoisena k\u00e4\u00e4pi\u00f6n\u00e4, kun taas suuremmat t\u00e4hdet, joiden massa on suurempi kuin 11 Auringon massaa p\u00e4\u00e4tyv\u00e4t supernoviksi, jotka johtuvat t\u00e4hden ytimen luhistumisesta. Kuitenkin keskimassaisten t\u00e4htien evolutiivinen kaari on viel\u00e4 ep\u00e4selv\u00e4. On arvioitu, ett\u00e4 keskimassaisten t\u00e4htien evoluutiossa 20Ne ytimeen taphtuvilla elektronisieppauksilla, jotka johtavat 20Fe ytimen perustilalle, on t\u00e4rke\u00e4 rooli. Kuitenkin t\u00e4lle perustilalta perustilalle tapahtuvan siirtym\u00e4n voimakkuudelle on m\u00e4\u00e4ritetty vain kokeellinen yl\u00e4raja. T\u00e4m\u00e4 ty\u00f6 keskittyy mittauslaitteiston, jolla mittasimme onnistuneesti kyseisen siirtym\u00e4n vahvuuden ensimm\u00e4ist\u00e4 kertaa, kokeelliseen kehitysty\u00f6h\u00f6n.\n\nMittaukset tapahtuivat IGISOL-tutkimusryhm\u00e4n tiloissa Jyv\u00e4skyl\u00e4n yliopiston kiihdytinlaboratoriossa. 20F+-ionit tuotettiin 19F(d,p)20F reaktiolla k\u00e4ytt\u00e4m\u00e4ll\u00e4 9 MeV energist\u00e4 deuteronihiukkassuihkua. Kokeellinen laitteisto koostui Siegbahn-Sl\u00e4tis tyypin keskikuvantavasta spektrometrist\u00e4, muovituikeilmaisimesta ja LaBr3(Ce)-ilmaisimesta. T\u00e4m\u00e4 ty\u00f6 antaa kuvauksen k\u00e4ytetyst\u00e4 mittauslaitteistosta ja sen testauksesta sek\u00e4 lyhyen esittelyn t\u00e4htien evoluutioon liittyvist\u00e4 aiheista ja katsauksen onnistuneeseen perustilalta perustilalle tapahtuvan siirtym\u00e4n mittaukseen.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The evolution of stars is determined by the stars initial mass, smaller stars with masses under eight solar masses end their life as a white dwarf when the heavier stars with masses over 11 solar masses end as core-collapse supernovae. The evolutionary path of the intermediate-mass star with masses between 8 to 11 solar masses is still uncertain. The electron capture on 20Ne ground state leading to 20F ground state has been estimated to have an important role in the evolution of intermediate-mass stars. The branching of this ground-state to ground-state transition has previously had only an experimental upper limit. This thesis focuses on the experimental developments of a measurement setup which we used to measure this branching ratio for the first time.\n\nThe measurement was done at the Ion Guide Isotope Separator On-Line (IGISOL) facility in the Accelerator Laboratory of the University of Jyv\u00e4skyl\u00e4. The 20F+ ions were produced via 19F(d,p)20F reaction with a 9 MeV deuteron beam. The experimental setup consisted of a Siegbahn-Sl\u00e4tis type of intermediate-image spectrometer, plastic scintillator detector and of LaBr3(Ce) detector. This work gives of a detailed description of the measurement setup and its testing as well as a brief discussion of the stellar evolution related topics and of an overview of the successful experiment.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2019-11-18T12:16:33Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-11-18T12:16:33Z (GMT). No. of bitstreams: 0\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "105", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "stellar evolution", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "intermediate-mass stars", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "IGISOL", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "beta decay", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SiegbanhSl\u00e4tis type intermediate-image spectrometer", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "scintillator detector", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "t\u00e4htien evoluutio", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "IGISOL", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "beetahajoaminen", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Siegbahn-Sl\u00e4tis tyypin keskikuvantava spektrometri", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "tuikeilmaisin", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Experimental studies for the second-forbidden non-unique \u03b2-decay of 20F at IGISOL", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201911184923", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Fysiikka", "language": "fi", "element": 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