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[{"key": "dc.contributor.author", "value": "Jaries, Arthur", "language": null, "element": "contributor", "schema": "dc", "qualifier": "author"}, {"key": "dc.date.accessioned", "value": "2025-04-30T10:12:25Z", "language": null, "element": "date", "schema": "dc", "qualifier": "accessioned"}, {"key": "dc.date.available", "value": "2025-04-30T10:12:25Z", "language": null, "element": "date", "schema": "dc", "qualifier": "available"}, {"key": "dc.date.issued", "value": "2025", "language": null, "element": "date", "schema": "dc", "qualifier": "issued"}, {"key": "dc.identifier.isbn", "value": "978-952-86-0671-0", "language": null, "element": "identifier", "schema": "dc", "qualifier": "isbn"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/101714", "language": null, "element": "identifier", "schema": "dc", "qualifier": "uri"}, {"key": "dc.description.abstract", "value": "Atomiytimen yksi perusominaisuuksista on sen massa. Ytimen massa ja sidosenergia\nvoidaan m\u00e4\u00e4ritt\u00e4\u00e4 suurella tarkkuudella Penningin loukulla teht\u00e4vist\u00e4 atomimassamittauksista.\nYtimen sidosenergia on t\u00e4rke\u00e4 tutkiessa, kuinka ydinrakenne\nmuuttuu kauempana stabiileista isotoopeista. N\u00e4ill\u00e4 ominaisuuksilla on my\u00f6s\nastrofysikaalista merkityst\u00e4, sill\u00e4 niiden tarkka m\u00e4\u00e4ritt\u00e4minen vaikuttaa malleihin,\njotka kuvaavat alkuaineiden tuottoa t\u00e4hdiss\u00e4.\nTutkimus toteutettiin Jyv\u00e4skyl\u00e4n yliopiston kiihdytinlaboratorion Ion Guide\nIsotope Separator On-Line (IGISOL) -laitteistolla k\u00e4ytt\u00e4en JYFLTRAP -Penningin\nloukkua tarkkoihin atomimassamittauksiin. Atomimassat m\u00e4\u00e4ritettiin yhteens\u00e4\n19 neutronirikkaalle isotoopille, jotka sijaitsevat massalukujen A = 150 ja A =\n170 v\u00e4lill\u00e4 harvinaisten maametallien alueella. Mittauksissa k\u00e4ytettiin uusinta,\nionin vaiheen kuvantamiseen perustuvaa, niin kutsuttua PI-ICR tekniikkaa. Isotooppien\n<sup>152,153</sup>La, <sup>169</sup>Tb ja <sup>170,171</sup>Dy atomimassat m\u00e4\u00e4ritettiin kokeellisesti ensimm\u00e4ist\u00e4\nkertaa maailmassa. Tutkittujen isotooppiketjujen kahden neutronin\nirrotusenergiat m\u00e4\u00e4ritettiin paljon aiempaa tarkemmin, mik\u00e4 paljasti erityisesti\nharvinaisen ja odottamattoman voimakkaan kummun neutroniluvuilla N = 92\u2212\n94 lantaaniketjussa. Tutkittu alue protoniluvun Z \u2248 66 ja neutroniluvun N \u2248\n104 ymp\u00e4rist\u00f6ss\u00e4 on t\u00e4rke\u00e4 astrofysikaalisille laskuille. Tehdyt tarkat massamittaukset\nauttavat parantamaan nopean neutroninsieppausprosessin (r-prosessin)\nmallintamista ja ymm\u00e4rt\u00e4m\u00e4\u00e4n harvinaisten maametallien muodostumista siin\u00e4.\nTulos on merkitt\u00e4v\u00e4, sill\u00e4 astrofysikaalinen r-prosessi tuottaa noin puolet rautaa\nraskaampien alkuaineiden m\u00e4\u00e4r\u00e4st\u00e4 Aurinkokunnassa.\nRadioaktiivisten ionien tuottomenetelmien kehittyess\u00e4 voidaan tutkia yh\u00e4\neksoottisempia ytimi\u00e4 ja laajentaa tiet\u00e4myst\u00e4 niiden ominaisuuksista. Saksassa\nrakenteilla oleva Facility for Antiproton and Ion Research (FAIR) avaa uusia mahdollisuuksia\nharvinaisten ja eritt\u00e4in neutronirikkaiden ytimien tutkimiseen. Jotta\nsen ainutlaatuiset tuotantokyvyt voitaisiin hy\u00f6dynt\u00e4\u00e4 t\u00e4ysin, tasavirtaiset ionisuihkut\non hidastettava ja vapautettava ajallisesti erotettuina, lyhyin\u00e4 ionikimppuina\nmassaspektrometria- ja laserspektroskopiamittauksia varten. T\u00e4t\u00e4 tarkoitusta\nvarten kehitettiin uusi ionien j\u00e4\u00e4hdytin-kimputin nimelt\u00e4\u00e4n HIBISCUS. T\u00e4ss\u00e4\nv\u00e4it\u00f6skirjaty\u00f6ss\u00e4 HIBISCUS-laite suunniteltiin, rakennettiin ja otettiin k\u00e4ytt\u00f6\u00f6n.\nLaite tulee sijoittumaan FAIR-laboratorion NUSTAR-kokeen matalan energian\nosastolle. HIBISCUS-laitteen yksityiskohtaiset ominaisuudet ja suorituskyky\nesitet\u00e4\u00e4n t\u00e4ss\u00e4 v\u00e4it\u00f6skirjassa.", "language": "fin", "element": "description", "schema": "dc", "qualifier": "abstract"}, {"key": "dc.description.abstract", "value": "One of the fundamental properties of an atomic nucleus, its mass, can be probed\nwith high precision by means of Penning trap mass spectrometry. The related nuclear\nbinding energy is important for studying how the nuclear structure evolves\nfurther away from stability. This property is also of astrophysical interest, as its\nprecise determination impacts the models describing the processes responsible\nfor stellar nucleosynthesis.\nThis research was carried out at the Ion Guide Isotope Separator On-Line\n(IGISOL) facility of the Accelerator Laboratory in Jyv\u00e4skyl\u00e4, using the JYFLTRAP\ndouble Penning trap mass spectrometer. In this thesis work, a total of 19 masses\nof neutron-rich isotopes, located around A = 150 and A = 170 in the rareearth\nregion of the nuclide chart, were measured using a state-of-the-art detection\nmethod, the Phase-Imaging Ion-Cyclotron-Resonance technique (PI-ICR). These\nresults extend the experimentally-known masses of the lanthanum, terbium and\ndysprosium isotopic chains with the first mass determination of the nuclides\n<sup>152,153</sup>La, <sup>169</sup>Tb and <sup>170,171</sup>Dy. The trends in two-neutron separation energies of\nthese chains were pinned down with unprecedented precision and notably revealed\na rare and unexpected strong bump at neutron numbers N = 92 \u2212 94\nin the lanthanum chain. The precision mass measurements in the doubly midshell\nregion around proton number Z \u2248 66 and neutron number N \u2248 104 also\nprovide valuable astrophysical inputs, to better model the formation of the rareearth\nabundance peak in the rapid neutron-capture process, responsible for the\nproduction of half of the heavy-element abundances in the Solar system.\nAs new radioactive ion beam facilities emerge to push further the boundaries\nof experimentally-reachable exotic nuclei, so do opportunities for studying\nand extending the knowledge on their properties. The upcoming Facility for Antiproton\nand Ion Research (FAIR) will give access to the study of rare and extremely\nneutron-rich nuclei. In order to fully utilize its unique production capabilities,\nthe continuous beams will have to be slowed down and released as\ntemporally-short ion bunches for the mass spectrometry and laser spectroscopy\nexperiments placed downstream. For this purpose, HIBISCUS, a new ion beam\ncooler-buncher, was developed and commissioned offline in the context of this research\nwork, as a Finnish in-kind contribution to the low-energy branch of FAIR.\nIts detailed characteristics and performance are reported in this thesis.", "language": "eng", "element": "description", "schema": "dc", "qualifier": "abstract"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2025-04-30T10:12:25Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "schema": "dc", "qualifier": "provenance"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2025-04-30T10:12:25Z (GMT). No. of bitstreams: 0\n Previous issue date: 2025", "language": "en", "element": "description", "schema": "dc", "qualifier": "provenance"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "schema": "dc", "qualifier": "mimetype"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "schema": "dc", "qualifier": "iso"}, {"key": "dc.publisher", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": null, "element": "publisher", "schema": "dc", "qualifier": null}, {"key": "dc.relation.ispartofseries", "value": "JYU Dissertations", "language": null, "element": "relation", "schema": "dc", "qualifier": "ispartofseries"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli I:</b> Jaries, A., Ruotsalainen, J., Kronholm, R., Eronen, T., & Kankainen, A. (2025). HIBISCUS : A new ion beam radio-frequency quadrupole cooler-buncher for high-precision experiments with exotic radioactive ions. <i>Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1073, Article 170273.</i> DOI: <a href=\"https://doi.org/10.1016/j.nima.2025.170273\"target=\"_blank\">10.1016/j.nima.2025.170273</a>", "language": null, "element": "relation", "schema": "dc", "qualifier": "haspart"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli II:</b> Jaries, A., Nikas, S., Kankainen, A., Eronen, T., Beliuskina, O., Dickel, T., Flayol, M., Ge, Z., Hukkanen, M., Mougeot, M., Pohjalainen, I., Raggio, A., Reponen, M., Ruotsalainen, J., Stryjczyk, M., & Virtanen, V. (2024). Probing the \ud835\udc41=104 midshell region for the \ud835\udc5f process via precision mass spectrometry of neutron-rich rare-earth isotopes with the JYFLTRAP double Penning trap. <i>Physical Review C, 110(4), Article 045809.</i> DOI: <a href=\"https://doi.org/10.1103/PhysRevC.110.045809\"target=\"_blank\">10.1103/PhysRevC.110.045809</a>. JYX: <a href=\"https://jyx.jyu.fi/handle/123456789/99556\"target=\"_blank\"> jyx.jyu.fi/handle/123456789/99556</a>", "language": null, "element": "relation", "schema": "dc", "qualifier": "haspart"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli III:</b> Jaries, A., Stryjczyk, M., Kankainen, A., Eronen, T., Beliuskina, O., Dickel, T., Flayol, M., Ge, Z., Hukkanen, M., Mougeot, M., Nikas, S., Pohjalainen, I., Raggio, A., Reponen, M., Ruotsalainen, J., & Virtanen, V. (2025). Prominent Bump in the Two-Neutron Separation Energies of Neutron-Rich Lanthanum Isotopes Revealed by High-Precision Mass Spectrometry. <i>Physical Review Letters, 134, Article 042501.</i> DOI: <a href=\"https://doi.org/10.1103/PhysRevLett.134.042501\"target=\"_blank\">10.1103/PhysRevLett.134.042501</a>. JYX: <a href=\"https://jyx.jyu.fi/handle/123456789/99903\"target=\"_blank\"> jyx.jyu.fi/handle/123456789/99903</a>", "language": null, "element": "relation", "schema": "dc", "qualifier": "haspart"}, {"key": "dc.title", "value": "Precision mass spectrometry of neutron-rich rare-earth isotopes and commissioning of HIBISCUS for preparation of exotic beams", "language": null, "element": "title", "schema": "dc", "qualifier": null}, {"key": "dc.type", "value": "doctoral thesis", "language": null, "element": "type", "schema": "dc", "qualifier": null}, {"key": "dc.identifier.urn", "value": "URN:ISBN:978-952-86-0671-0", "language": null, "element": "identifier", "schema": "dc", "qualifier": "urn"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": null, "element": "contributor", "schema": "dc", "qualifier": "faculty"}, {"key": "dc.contributor.faculty", "value": "Faculty of Mathematics and Science", "language": null, "element": "contributor", "schema": "dc", "qualifier": "faculty"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_db06", "language": null, "element": "type", "schema": "dc", "qualifier": "coar"}, {"key": "dc.relation.issn", "value": "2489-9003", "language": null, "element": "relation", "schema": "dc", "qualifier": "issn"}, {"key": "dc.rights.copyright", "value": "\u00a9 The Author & University of Jyv\u00e4skyl\u00e4", "language": null, "element": "rights", "schema": "dc", "qualifier": "copyright"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "schema": "dc", "qualifier": "accesslevel"}, {"key": "dc.type.publication", "value": "doctoralThesis", "language": null, "element": "type", "schema": "dc", "qualifier": "publication"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "schema": "dc", "qualifier": "content"}, {"key": "dc.description.accessibilityfeature", "value": "unknown accessibility", "language": "en", "element": "description", "schema": "dc", "qualifier": "accessibilityfeature"}, {"key": "dc.description.accessibilityfeature", "value": "ei tietoa saavutettavuudesta", "language": "fi", "element": "description", "schema": "dc", "qualifier": "accessibilityfeature"}]
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