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EFEK VARIASI RADIUS NUKLEON TERHADAP PERSAMAAN KEADAAN BINTANG NEUTRON Suparti, Suparti; Sulaksono, A.; Mart, T.
Jurnal Spektra Vol 15, No 1 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

The isoscalar parameter of SNM and the isovector parameter of PNM from various nucleon sizes as well as the effects of the fitting on medium density and low density prediction regimes of PNM have been investigated. To this end, we have chosen the cut-off parameter β = 0.0005 and β = 0.01, with the nucleon radii of 0, 0.66, 0.76, 0.83, and 0.99 fm. The obtained isoscalar parameters are in a good agreement with the result of the DBHF calculation for all nucleon radii used, except for rN = 0.99 fm, which does not fulfill the SNM EOS prediction based on the result of heavy ion collision. On the other hand, the effect of fitting of the parameters outside the upper and lower bounds leads to a disagreement with the experimental result of Danielwicz et al. It is suspected that this could happen due to the limitation of the parameter range β, as well as the nucleon radius. Keywords: nucleon radius, parameter, equation of state
EFEK VARIASI RADIUS NUKLEON TERHADAP PERSAMAAN KEADAAN BINTANG NEUTRON Suparti, Suparti; Sulaksono, A.; Mart, T.
Spektra: Jurnal Fisika dan Aplikasinya Vol 15 No 1 (2014): SPEKTRA, Volume 15 Nomor 1, Mei 2014
Publisher : Program Studi Fisika Universitas Negeri Jakarta

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Abstract

AbstrakParameter isoskalar SNM dan parameter isovektor PNM untuk berbagai nilai radius nukleon serta efek fitting pada prediksi daerah medium density dan low density PNM, dengan menggunakan nilai jangkauan parameter β = 0.0005 dan β = 0.01 serta radius nukleon 0, 0.66 fm, 0.76 fm, 0.83 fm, dan 0.99 fm telah berhasil diperoleh. Parameter isoskalar hasil fit menghasilkan nilai yang cocok dengan perhitungan DBHF untuk semua radius nukleon yang digunakan, kecuali untuk radius 0.99 fm yang tidak memenuhi prediksi EOS SNM, menurut hasil eksperimen tumbukan ion berat. Sementara itu, efek fitting untuk parameter-parameter di luar daerah fitting window tidak sesuai dengan jangkauan eksperimen Danielewicz, dkk. Hal ini kemungkinan diakibakan oleh keterbatasan jangkauan parameter (nilai β) dan radius nukleon yang digunakan. AbstrakEffects of the Nucleon Radius Variation on the Equation of State of Neutron Star The isoscalar parameter of SNM and the isovector parameter of PNM from various nucleon sizes as well as the effects of the fitting on medium density and low density prediction regimes of PNM have been investigated. To this end, we have chosen the cut-off parameter β = 0.0005 and β = 0.01, with the nucleon radii of 0, 0.66, 0.76, 0.83, and 0.99 fm. The obtained isoscalar parameters are in a good agreement with the result of the DBHF calculation for all nucleon radii used, except for rN = 0.99 fm, which does not fulfill the SNM EOS prediction based on the result of heavy ion collision. On the other hand, the effect of fitting of the parameters outside the upper and lower bounds leads to a disagreement with the experimental result of Danielwicz et al. It is suspected that this could happen due to the limitation of the parameter range β, as well as the nucleon radius.
MAGNETIC MOMENT OF THE PROTON FROM KAON PHOTOPRODUCTION UP TO 16 GeV Mart, T.
Jurnal Sains Materi Indonesia Vol 5, No 1: Oktober 2003
Publisher : Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of

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Abstract

MAGNETIC MOMENT OF THE PROTON FROM KAON PHOTOPRODUCTION UP TO 16 GeV. By using the Gerasimov-Drell-Heam (GDH) sum rule and an isobar model of kaon photoproduction, we calculate contributions of kaon-hyperon final states to the magnetic moment of the proton and the neutron. We find that the contributions are small. We further extend the isobar model for kaon photoproduction to consider higher energy data by combining the model with a Regge approach. The extended model works nicely between threshold and 16 GeV. We use the model to refine the calculation up to 16 GeV. PACS number(s): 13.60.Le,11.55.Hx, 13.40.Em, 14.20.Dh