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"Dalam skripsi ini, peneliti bertujuan mencari perhitungan dan membuat perbandingan stopping power penetrasi proyektil dengan target yang berupa elektron dan inti atom. Eksitasi dari elektron target merupakan kontribusi yang diperhitungkan untuk berkurangnya energi proyektil. Perhitungan rumus dilakukan dari Bethe Stopping Power dengan aproksimasi Born hingga perturbasi orde kedua, biasa disebut efek Barkas. Pada aproksimasi Born pertama, inti atom tidak berperan begitu besar dalam menghasilkan energi stopping power. Sedangkan elektron menunjukkan hasil yang signifikan.

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In this thesis, the researcher intends to measure and compare the stopping power of penetration between projectile and the targets which are electrons and nuclei. The contribution to the energy loss of the projectile is solely due to excitation of the target electrons. The calculation is derived from Bethe’s stopping power using the Born approximation up to the second order perturbation, commonly known as the Barkas effect. In the first Born approximation, it is showed that nuclei does not really participate in resulting stopping power energy. On the other hand, electrons shows big significant result."

"Produksi D meson sebagai fungsi multiplisitas partikel bermuatan telah diukur menggunakan ALICE detektor di LHC. Pengukuran ini dilakukan menggunakan data tumbukan proton-proton pada energi pusat massa 13 TeV yang direkam oleh ALICE detektor pada periode pengambilan data tahun 2016. D meson direkonstruksi melalui produk peluruhan hadroniknya pada empat interval pT dari 2 GeV/c sampai 24 GeV/c dengan ?

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D meson production as a function of charged particle multiplicity in proton proton collisions have been measured using ALICE detector at the LHC. This measurement was performed using proton proton collisions data at center of mass energy 13 TeV recorded by ALICE during the 2016 data taking periods. D meson were reconstructed through its hadronic decay product in four pT intervals ranged from 2 GeV c to 24 GeV c with "