G5 Doctoral dissertation (article)
Mass measurements and production of ions at IGISOL for the astrophysical r- and rp-processes (2019)

Vilén, M. (2019). Mass measurements and production of ions at IGISOL for the astrophysical r- and rp-processes [Doctoral dissertation]. Jyväskylän yliopisto. JYU dissertations, 123. http://urn.fi/URN:ISBN:978-951-39-7838-9

JYU authors or editors

Publication details

All authors or editors: Vilén, Markus

eISBN: 978-951-39-7838-9

Journal or series: JYU dissertations

eISSN: 2489-9003

Publication year: 2019

Number in series: 123

Number of pages in the book: 1 verkkoaineisto (85 sivua, 39 sivua useina numerointijaksoina) :

Publisher: Jyväskylän yliopisto

Place of Publication: Jyväskylä

Publication country: Finland

Publication language: English

Persistent website address: http://urn.fi/URN:ISBN:978-951-39-7838-9

Publication open access: Openly available

Publication channel open access: Open Access channel

Abstract

The masses of 27 nuclear ground states and three isomeric states have been measuredwith the JYFLTRAP double Penning trap mass spectrometer at the IonGuide Isotope Separator On-Line (IGISOL) facility. The studied nuclides are locatedin two separate regions of the nuclear chart, the neutron-rich rare-earthregion around A ≈ 160 and the neutron-deficient A ≈ 80 region near the N = Zline. The mass measurements were performed using the the Time-of-Flight Ion-Cyclotron Resonance and Phase-Imaging Ion-Cyclotron Resonance techniques.The impact of the measured masses on the astrophysical rapid neutron captureprocess (r-process) was studied for several trajectories representing a neutronstarmerger scenario. The masses of two nuclides near the N = Z line werepredicted using mirror displacement energies and the masses of their mirror partnersmeasured in this work. Additionally, the effects of the measured masses onnuclear structure and the mass surface in both regions of the nuclear chart werestudied. An upgraded version of the Heavy-ion Ion Guide Isotope Separator On-Line (HIGISOL) system for the production of radioactive ions using heavy-ionbeams has been commissioned and successfully used in its first on-line experiment.The new off-line ion source facility has been brought into routine use at theIGISOL facility and used in various experiments. Systematic studies on the effectof ion count rate on mass measurements at JYFLTRAP have been performedusing stable ion beams from the new ion source station.

Keywords: nuclear physics; astrophysics; isotopes

Free keywords: r-process; nuclear structure; IGISOL; off-line ion beams; systematic uncertainty; penning trap

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2019