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All Journal Physics Communication Wahana Fisika : Jurnal Fisika dan Terapannya
Eko Tri Sulistyani
Universitas Gadjah Mada
Astronomy Earth & Planetary Sciences Engineering Materials Science & Nanotechnology Physics

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Symmetry Energy in the Inner Crust Region of Neutron Stars: A Study Around the Neutron Drip Density Point using the Compressed Liquid Drop Model Eko Tri Sulistyani; Yusuf Panji Wisnuaji; Romy Hanang Setya Budhi
Physics Communication Vol 7, No 2 (2023): August 2023
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v7i2.47139

Abstract

The properties of neutron star’s inner crust have been investigated using the Compressible Liquid Drop Model, particularly around the neutron drip density region, which is the boundary between the outer and inner crust. Symmetry energy in the equations of state SLy4 and BSk3 was calculated to determine the density data between the outer and inner crusts.  The properties of the inner crust can be understood through parameters such as the change in the number of nucleons in the atomic nucleus, the asymmetry parameter in surface energy, and volume energy. It was shown that the choice of the symmetry energy expansion coefficient (L) of order-1 results in a distinct energy range of 9-11 MeV within the neutron drip region. This contrasts significantly with the energy symmetry observed around saturation density, which reaches (30 ± 4) MeV in the reference models used. Furthermore, it was found that symmetry energy affects the neutron composition in the inner crust. As the density increases, neutron numbers rise, while proton counts exhibit relative stability within the range of 40 to 50 for each atomic nucleus. Importantly, we observe a marked decrease in proton fraction at the onset of the neutron drip region, where ???? ≅10 MeV, suggesting electron capture processes transforming protons into neutrons. This phenomenon contributes to the presence of neutron and free neutron gas layers within the inner crust.
KAJIAN TENTANG ENERGI SIMETRI, DAN PENGARUHNYA TERHADAP KERAK DALAM BINTANG NEUTRON Eko Tri Sulistyani; Yudisthira Iriana Putra
Wahana Fisika Vol 4, No 2 (2019): December
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v4i2.15598

Abstract

Telah dilakukan kajian mengenai Energi Simetri dan pengaruhnya terhadap Bintang Neutron terutama bagian Kerak Dalam. Pada penelitian kali ini bagian kerak dalam Bintang Neutron dimodelkan menggunakan Model Tetes Cairan Termampatkan (CLDM), sebuah model sederhana bersifat semiklasik yang berfokus pada efek-efek makroskopis serta mampu menggambarkan inti dalam kondisi bertekanan tinggi. Rentang nilai Energi Simetri yang digunakan diperoleh menggunakan model MSL dan menunjukkan rentang nilai 25L115. Kemudian parameter energi simetri J dan L dimasukkan dalam model CLDM untuk memperoleh pengaruhnya terhadap komposisi Kerak Dalam Bintang Neutron. Hasil penelitian menunjukkan bahwa variasi parameter energi simetri J dan L memiliki pengaruh terhadap komposisi Kerak Dalam Bintang Neutron yaitu fraksi neutron bebas, fraksi volume berisi inti bermuatan, fraksi proton pada inti, serta ukuran sel WS. Diketahui pula bahwa fase transisi kerak-inti dipengaruhi oleh nila energi simetri.
Co-Authors Romy Hanang Setya Budhi Yudisthira Iriana Putra Yusuf Panji Wisnuaji