A3F-CNS Summer School 2020

Evaluation of the astrophysical rates of the 42Ti(p,γ)43V and 43V(p,γ)44Cr reactions

17 Aug 2020, 16:20

15m

Young Scientist Session 1

Speaker

KimUyen Nguyen (Sungkyunkwan University)

Description

In this study we estimated the astrophysical rates of the ${}^{42}$Ti$(p,\gamma {)}^{43}$V and ${}^{43}$V$(p,\gamma {)}^{44}$Cr reactions and their variations due to mass uncertainties of the ${}^{43}$V and ${}^{44}$Cr exotic nuclei in the rp-process. The associated photodisintegration related to the $(p,\gamma )-(\gamma ,p)$ equilibrium is also considered. The results show that the photodisintegration-rate variation of the ${}^{42}$Ti$(p,\gamma {)}^{43}$V and ${}^{43}$V$(p,\gamma {)}^{44}$Cr reactions are decreased at higher temperatures. The proton-capture rate variation between those reactions at $T_9$ = 0.5 is about 35% while it is approximately 60% at $T_9$ = 2.0. We found that the rate variation less than 20% if the precise mass of 10 keV can be achieved. To reduce the variation of the astrophysical rates, the precise mass measurements using MR-TOF technique at future facility RAON is suggested. Therefore, we also analyzed the resolving power, mass precision, counting rate, timing spread, and the half-life of the exotic isotopes for the MR-TOF technique. It is found that to achieve a mass accuracy of 0.1 ppm at the resolving power 10${}^5$, a counting number of 10${}^4$ is required for the isotopes. In addition, the half-life of the exotic nuclei must be longer than 10 ms for the reflections in the measurements using MR-TOF systems.

Keywords: mass uncertainty, reaction rates, rp-process, MR-TOF technique, exotic isotopes, timing spread, resolving power.