| fullrecord |
[{"key": "dc.contributor.advisor", "value": "Auranen, Kalle", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Kokkonen, Henna", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2023-05-24T04:41:35Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2023-05-24T04:41:35Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2023", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/87126", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 Pro Gradu -tutkielmassa tutkitaan uusia astatiinin isotooppeja ja niiden hajoamisominaisuuksia. 190-At isotoopin ominaisuuksia on tutkittu onnistuneesti. T\u00e4m\u00e4n lis\u00e4ksi mittauksessa havaittiin kaksi tapahtumaa, joiden voidaan arvioida olevan per\u00e4isin t\u00e4h\u00e4n asti raskaimmasta raportoidusta protonihajoavasta ytimest\u00e4, 188-At. Ytimet tuotettiin fuusio-h\u00f6yrystymisreaktiolla k\u00e4ytt\u00e4m\u00e4ll\u00e4 NAT-Ag kohtiota ja 84-Sr ionisuihkua energioilla v\u00e4lill\u00e4 355 MeV-380 MeV (keskell\u00e4 kohtiota). Mittaus on toteutettu JYFL Kiihdytinlaboratoriossa k\u00e4ytt\u00e4m\u00e4ll\u00e4 K-130 hiukkaskiihdytint\u00e4 sek\u00e4 RITU (Recoil Ion Transport Unit) kaasut\u00e4ytteist\u00e4 rekyyliseparaattoria. 190-At:lle mitattuja arvoja ovat alfahiukkasen hajoamisenergia 7750(20) keV, sek\u00e4 puoliintumisaika 1.0(+1.4)(-0.4) ms. Mitattuja ominaisuuksia tarkasteltiin ja niiden avulla pystyttiin m\u00e4\u00e4ritt\u00e4m\u00e4\u00e4n muita ominaisuuksia, kuten tilan spin ja pariteetti, joiden ehdotetaan olevan (10^-). T\u00e4m\u00e4 perustuu siihen, ett\u00e4 ytimen hajoaminen m\u00e4\u00e4ritettiin sallituksi alfahajoamiseksi, jolloin alku- ja lopputilojen spin ja pariteetti pysyv\u00e4t samana. 190-At:n lis\u00e4ksi havaittiin yksi tapahtuma, joka vastaa mahdollisesti protonihajoavaa astatiinin ydint\u00e4, 188At. My\u00f6s t\u00e4m\u00e4n ytimen ominaisuuksia tutkittiin ja ytimen protonihiukkasen hajoamisenergiaksi m\u00e4\u00e4ritettiin 1500(40) keV ja puoliintumisajaksi 190(+350)(-80) \u03bcs. M\u00e4\u00e4ritettyj\u00e4 tuloksia verrattiin teoreettisiin ennustuksiin sek\u00e4 ymp\u00e4r\u00f6ivien ytimien systematiikkaan, joihin ne sopivat hyvin.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "In this thesis new astatine isotopes and their decay properties are studied. The properties of the most neutron deficient isotope of astatine to date, 190-At, were studied successfully. Additionally, two candidate events were recorded for the heaviest proton emitter observed to date, 188-At. The isotopes were produced in a fusion-evaporation reaction using NAT-Ag target and 84-Sr beam with energies between 355 - 380 MeV (c.o.t). The experiment was carried out in JYFL Accelerator laboratory using the K-130 cyclotron and RITU (Recoil Ion Transport Unit) gas-filled separator. The measured values for 190-At alpha decay properties were an alpha particle energy of 7750(20) keV and a half-life of 1.0(+1.4)(-0.4) ms. The measured properties were analysed and the same spin and parity as the final state (10^-) is suggested, since the decay was calculated to be unhindered. Moreover, there are two events that correspond to the proton and alpha emission from 188-At. The decay properties of this proton emitter were studied as well, and the measured proton-emission energy was 1500(40) keV and the half-life 190(+350)(-80) \u03bcs. The measured values are compared to the theoretical predictions, and to the systematics of the neighboring nuclei, in which they fit well.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2023-05-24T04:41:35Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2023-05-24T04:41:35Z (GMT). No. of bitstreams: 0\n Previous issue date: 2023", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "47", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "alpha decay", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Decay properties of the new isotopes 188-At and 190-At", "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-202305243198", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "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": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.copyright", "value": "\u00a9 The Author(s)", "language": null, "element": "rights", "qualifier": "copyright", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4021", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ydinfysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "isotoopit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spektroskopia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "astatiini", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "nuclear physics", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "isotopes", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "physics", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spectroscopy", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "astatine", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
|