Abstract
Determining the position of one- and two-proton dripline for isotone of N = 18, 20, and 22 has been studied through Modified Relativistic Mean Field (MRMF). The model exemplifies three impacts, namely isovector-isoscalar coupling, tensors, and electromagnetic exchange through five parameter set variations. The position of one- and two-proton dripline for the isotones is predicted by applying two methods, which are two-proton separation energy, and Fermi energy. The research shows that the prediction of one- and two-proton dripline for isotone of N = 18, and N = 20 is positioned at Z = 22 and Z = 26 consecutively. Then, the prediction of one- and two-proton dripline for isotone of N = 22 has two positions, Z = 26 and Z = 28. The calculation result indicates that the position prediction for isotone of N = 18, N = 20, and N = 22 is following the research result conducted by Nazarewicz with RMF+NLSH model [1]. Meanwhile, isovector-isoscalar coupling, tensors, and electromagnetic exchange do not affect massively for the position prediction of two-proton dripline. However, the three methods affect one-proton dripline.
Highlights
IntroductionThe nuclear chart divides into several regions, such as the valley of β-stability (stable nuclei, nonradioactive or long-lived) and terra incognita region (radioactive nuclei with an extreme ratio of neutron and proton) [2]
Nuclei consist of protons and neutrons with a variety of amount combination
It is applied with Fermi energy, while the position prediction of twoproton dripline is applied with separation energy
Summary
The nuclear chart divides into several regions, such as the valley of β-stability (stable nuclei, nonradioactive or long-lived) and terra incognita region (radioactive nuclei with an extreme ratio of neutron and proton) [2]. Proton dripline has been studied since the beginning of nuclear reactions because it is much closer to the valley of stability than the neutron dripline. The MRMF model is sufficiently reliable to investigate the proton dripline, such as non-relativistic model [4]. The position of one- and two-proton dripline for the isotones are investigated further by applying MRMF Model with five parameter set variations. The five variations show the correlation between position prediction for one- and two-proton dripline and three impacts, that is isovector-isoscalar coupling, electromagnetic exchange, and tensors
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