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J/ApJ/844/139                Atomic mass excesses                (Schatz+, 2017)

Dependence of X-ray burst models on nuclear masses. Schatz H., Ong W.-J. <Astrophys. J., 844, 139 (2017)> =2017ApJ...844..139S
ADC_Keywords: Atomic physics ; Models Keywords: nuclear reactions, nucleosynthesis, abundances; X-rays: bursts Abstract: X-ray burst model predictions of light curves and the final composition of the nuclear ashes are affected by uncertain nuclear masses. However, not all of these masses are determined experimentally with sufficient accuracy. Here we identify the remaining nuclear mass uncertainties in X-ray burst models using a one-zone model that takes into account the changes in temperature and density evolution caused by changes in the nuclear physics. Two types of bursts are investigated-a typical mixed H/He burst with a limited rapid proton capture process (rp-process) and an extreme mixed H/He burst with an extended rp-process. When allowing for a 3σ variation, only three remaining nuclear mass uncertainties affect the light-curve predictions of a typical H/He burst (27P, 61Ga, and 65As), and only three additional masses affect the composition strongly (80Zr, 81Zr, and 82Nb). A larger number of mass uncertainties remain to be addressed for the extreme H/He burst, with the most important being 58Zn, 61Ga, 62Ge, 65As, 66Se, 78Y, 79Y, 79Zr, 80Zr, 81Zr, 82Zr, 82Nb, 83Nb, 86Tc, 91Rh, 95Ag, 98Cd, 99In, 100In, and 101In. The smallest mass uncertainty that still impacts composition significantly when varied by 3σ is 85Mo with 16keV uncertainty. For one of the identified masses, 27P, we use the isobaric mass multiplet equation to improve the mass uncertainty, obtaining an atomic mass excess of -716(7)keV. The results provide a roadmap for future experiments at advanced rare isotope beam facilities, where all the identified nuclides are expected to be within reach for precision mass measurements. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 25 3493 Atomic mass excesses used in this work
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ENum [1/118] Element number 5- 7 I3 --- MNum [2/295] Mass number 9- 15 F7.3 MeV Excess [-91.7/201.5] Atomic mass excess 17- 21 F5.3 MeV e_Excess [0/2.1] Uncertainty in Excess 23- 25 A3 --- r_Excess Source of Excess (1)
Note (1): Source as follows: Exp = Experimental value in Atomic Mass Evaluation AME2012 (Wang+ 2012ChPhC..36....3W); XTP = Extrapolation in AME2012; CDE = Coulomb Displacement Energy calculation (Brown+ 2002PhRvC..65d5802B).
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Mar-2018
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