Rutenium-98 isotoopin tarkkuusmassamittaus JYFLTRAP Penningin loukulla

Nykänen, Tomi

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Nykänen, Tomi

Päivämäärä

2021

Oppiaine

Fysiikka Physics

Rutenium-98 isotoopin atomimassa on huonoiten tunnettu kaikista stabiileista isotoopeista. Sen ajankohtaisin taulukkoarvo perustuu 1960- ja 1970-luvuilla suoritettuihin mittauksiin, minkä seurauksena massaylijäämän arvo, (-88225 ± 6) keV, on jäänyt epätarkaksi. Rutenium-98 on niin kutsuttu p-isotooppi, jota tuotetaan astrofysikaalisen γ-prosessin kautta esimerkiksi supernovaräjähdyksissä. Kuten p-isotoopit yleensä, myös rutenium-98 on harvinainen isotooppi. Sen pitoisuus luonnon ruteniumista on vain 1,87%. Tässä pro gradu -tutkielmassa rutenium-98:n atomimassan tarkkuutta parannetaan mittaamalla se JYFLTRAP Penningin loukulla. Molybdeeni-98 (protoniluku Z=42) voi hajota kaksoisbeetahajoamisella Ru-98:ksi (Z=44). Molybdeeni-98 isotoopin massaylijäämä (-88115,98 ± 0,17) keV on jo hyvin tarkasti tunnettu. Tämän reaktion parempaan mallintamiseen tarvitaan tarkkaa Q-arvoa, joka voidaan määrittää JYFLTRAP Penningin loukulla erittäin tarkasti. Tässä työssä molybdeeni-98:aa hyödynnettiin myös ... showmore

The atomic mass of the ruthenium-98 isotope is the least known of all stable isotopes. Its current literary value is based on measurements done in 1960s and 1970s, and its mass-excess value, (-88225 ± 6) keV, has a very high uncertainty. It is a socalled p-isotope and is produced through the astrophysical γ-process in for example, supernova explosions. Its share of natural ruthenium is just 1.87%. In this master’s thesis the atomic mass of ruthenium-98 is measured more accurately using the JYFLTRAP Penning trap. Molybdenium-98 (proton number Z=42) can double-beta decay into Ru-98 (Z=44). Its mass excess (-88115.98 ± 0.17) keV is already known very accurately. To model the double beta-decay better its Q-value has to be known precisely. This can be determined very accurately with the JYFLTRAP Penning trap. In this work, molybdenium-98 was also utilized as a reference ion. As a result, the mass excess of (-88229.8 ± 0.3) keV was achieved for Ru-98, which is equal to total mass of (97.905 ... showmore

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