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MEKANISME
PELURUHAN
     ALFA
 MENURUT TEORI GAMOW, GURNEY, DAN CONDON
                                   (1928)

                            Banjarmasin, Maret 2013
                                   By. Nispi Hariyani
                                       (A1C410024)
(sumber gambar:
                                     http://id.wikipedia.org/w/index.php?title=Penerowongan_kuan
                                     tum&oldid=6349985)




Tahun 1928, secara terpisah   Dalam mekanika kuantum penerowongan
                              kuantum merupakan salah satu fenomena
Gamow, Gurney, dan Condon
                              berskala nano dimana sebuah partikel
berhasil menjelaskan
                              melanggar asas mekanika klasik dengan
peristiwa peluruhan dengan    menembus melanggar penghalang potensial
perhitungan mekanika          maupun impedansi yang lebih tinggi
kuantum                       dari energi kinetis partikelnya.
PENJELASAN PERISTIWA PELURUHAN ALFA
  DENGAN MENGGUNAKAN PERHITUNGAN MEKANIKA
                  KUANTUM
• Partikel alfa diasumsikan
  sebagai partikel yang berada
  dalam inti, partikel hasil
  gabungan dari 2 buah proton
  dan 2 buah neutron yang
  terikat oleh gaya inti
• Partikel semacam ini terus-
  menerus bergerak, dengan
  gerakan dibatasi hanya dalam
  inti oleh rintangan potensial
  yang melingkupinya
• Terdapat peluang kecil tertentu
  untuk partikel ini melewati
  rintangan ini setiap kali terjadi
  tumbukan dengannya
  (walaupun potensial perintang       Sumber gambar:

  > energi partikel alfa).            http://nagysandor.eu/AsimovTeka/AlphaExamples/index_en.html
BAGAIMANA
                 PELUANGNYA?
Satu-satunya cara partikel alfa
dapat lolos keluar adalah
dengan “menerobos”
potensial penghalangnya

Lolos keluar = peluruhan alfa
        dari inti induk
Gambar di bawah ini merupakan plot dari energi potensial B dari partikel
alfa sebagai fungsi dari jarak r dari pusat inti berat tertentu.




                                                               Partikel alfa tidak
Partikel alfa tidak                                            dapat masuk
dapat meloloskan                                               (secara klasik)
diri (secara klasik)




                                                       Sumber gambar: Yusman, 2006: 133)
Mekanisme peluruhan alfa

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Mekanisme peluruhan alfa

  • 1. MEKANISME PELURUHAN ALFA MENURUT TEORI GAMOW, GURNEY, DAN CONDON (1928) Banjarmasin, Maret 2013 By. Nispi Hariyani (A1C410024)
  • 2. (sumber gambar: http://id.wikipedia.org/w/index.php?title=Penerowongan_kuan tum&oldid=6349985) Tahun 1928, secara terpisah Dalam mekanika kuantum penerowongan kuantum merupakan salah satu fenomena Gamow, Gurney, dan Condon berskala nano dimana sebuah partikel berhasil menjelaskan melanggar asas mekanika klasik dengan peristiwa peluruhan dengan menembus melanggar penghalang potensial perhitungan mekanika maupun impedansi yang lebih tinggi kuantum dari energi kinetis partikelnya.
  • 3. PENJELASAN PERISTIWA PELURUHAN ALFA DENGAN MENGGUNAKAN PERHITUNGAN MEKANIKA KUANTUM • Partikel alfa diasumsikan sebagai partikel yang berada dalam inti, partikel hasil gabungan dari 2 buah proton dan 2 buah neutron yang terikat oleh gaya inti • Partikel semacam ini terus- menerus bergerak, dengan gerakan dibatasi hanya dalam inti oleh rintangan potensial yang melingkupinya • Terdapat peluang kecil tertentu untuk partikel ini melewati rintangan ini setiap kali terjadi tumbukan dengannya (walaupun potensial perintang Sumber gambar: > energi partikel alfa). http://nagysandor.eu/AsimovTeka/AlphaExamples/index_en.html
  • 4. BAGAIMANA PELUANGNYA? Satu-satunya cara partikel alfa dapat lolos keluar adalah dengan “menerobos” potensial penghalangnya Lolos keluar = peluruhan alfa dari inti induk
  • 5. Gambar di bawah ini merupakan plot dari energi potensial B dari partikel alfa sebagai fungsi dari jarak r dari pusat inti berat tertentu. Partikel alfa tidak Partikel alfa tidak dapat masuk dapat meloloskan (secara klasik) diri (secara klasik) Sumber gambar: Yusman, 2006: 133)