Massive neutron stars and &Lambda;-hypernuclei in relativistic mean field models

Ting-Ting Sun; Cheng-Jun Xia; Shi-Sheng Zhang; M. S. Smith

doi:10.1088/1674-1137/42/2/025101

Chinese Physics C> 2018, Vol. 42> Issue(2) : 025101 DOI: 10.1088/1674-1137/42/2/025101

Massive neutron stars and Λ-hypernuclei in relativistic mean field models

1.
School of Physics and Engineering and Henan Key Laboratory of Ion Beam Bioengineering, Zhengzhou University, Zhengzhou 450001, China
2.
School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
3.
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
4.
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
5.
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6354, USA

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Abstract：
Based on relativistic mean field (RMF) models, we study finite Λ-hypernuclei and massive neutron stars. The effective m N-m N interactions PK1 and TM1 are adopted, while the m N-Λ interactions are constrained by reproducing the binding energy of Λ-hyperon at 1s orbit of _Λ⁴⁰Ca. It is found that the Λ-meson couplings follow a simple relation, indicating a fixed Λ potential well for symmetric nuclear matter at saturation densities, i.e., around V_Λ=-29.786 MeV. With those interactions, a large mass range of Λ-hypernuclei can be described well. Furthermore, the masses of PSR J1614-2230 and PSR J0348+0432 can be attained adopting the Λ-meson couplings g_σΛ/g_σN≳ 0.73, g_ωΛ/g_ωN≳0.80 for PK1 and g_σΛ/g_σN≳ 0.81, g_ωΛ/g_ωN≳ 0.90 for TM1, respectively. This resolves the hyperon puzzle without introducing any additional degrees of freedom.
- massive neutron stars ,
- -hypernuclei ,
- relativistic mean field theory

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Ting-Ting Sun, Cheng-Jun Xia, Shi-Sheng Zhang and M. S. Smith. Massive neutron stars and Λ-hypernuclei in relativistic mean field models[J]. Chinese Physics C, 2018, 42(2): 025101. doi: 10.1088/1674-1137/42/2/025101

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Received: 2017-10-23

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Supported by National Natural Science Foundation of China (11525524, 11505157, 11375022, 11705163, 11621131001), National Key Basic Research Program of China (2013CB834400), the Physics Research and Development Program of Zhengzhou University (32410017) and the Office of Nuclear Physics in the U.S. Dept. of Energy. The computation for this work was supported by the HPC Cluster of SKLTP/ITP-CAS and the Supercomputing Center, CNIC, of the CAS

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