High-precision mass measurements for the rp-process at JYFLTRAP
Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kankainen, Anu; Moore, Iain; Nesterenko, Dmitrii; Rinta-Antila, Sami (2017). High-precision mass measurements for the rp-process at JYFLTRAP. In Cognata, M. La; Lattuada, M.; Palmerini, S.; Pizzone, R.G.; Spitaleri, C. (Eds.) Nuclear Physics in Astrophysics VIII (NPA8 2017) Catania, Italy, June 18-23, 2017 (EPJ Web of Conferences, 165. EDP Sciences, 01008. DOI: 10.1051/epjconf/201716501008
Published inEPJ Web of Conferences
© The Authors, published by EDP Sciences, 2017. This is an open access article distributed under the terms of the Creative Commons License.
The double Penning trap JYFLTRAP at the University of Jyvaskyla has been successfully used to achieve high-precision mass measurements of nuclei involved in the rapid proton-capture (rp) process. A precise mass measurement of 31Cl is essential to estimate the waiting point condition of 30S in the rp-process occurring in type I x-ray bursts (XRBs). The mass-excess of 31Cl measured at JYFLTRAP, -7034.7(3.4) keV, is 15 more precise than the value given in the Atomic Mass Evaluation 2012. The proton separation energy Sp determined from the new mass-excess value confirmed that 30S is a waiting point, with a lowertemperature limit of 0.44 GK. The mass of 52Co effects both 51Fe(p,γ)52Co and 52Co(p,γ)53Ni reactions. The mass-excess value measured, - 34 331.6(6.6) keV is 30 times more precise than the value given in AME2012. The Q values for the 51Fe(p,γ)52Co and 52Co(p,γ)53Ni reactions are now known with a high precision, 1418(11) keV and 2588(26) keV respectively. The results show that 52Co is more proton bound and 53Ni less proton bound than what was expected from the extrapolated value. ...