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B. Santoso
Center For Partnership in Nuclear Technology, National Nuclear Energy Agency (BATAN) Puspiptek, Serpong
Materials Science & Nanotechnology

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Quantum Estimates of Alpha Emitter Life Time B. Santoso
Atom Indonesia Vol 32, No 1 (2006): January 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.113

Abstract

Quantum estimates of several alpha radioactive life time have been made using the probability of quantum tunneling through the nuclear potential barrier. It is assumed that for a given nucleus with mass number A and isotopic number Z, there exists an alpha particle moving freely back and forth in the nucleus with mass and isotopic numbers A -4 and Z-2. If the probability of penetrating the nuclear potential barrier is Τ, then after N times (N=1/Τ) hitting the barrier an alpha particle is emitted. To obtain the elapsed time for emitting an alpha particle requires N times τ0, where τ0 is the time travel for alpha across the nuclear diameter, which is dependent on alpha energy. It is assumed here that this kinetic energy is the same as the emitted energy. The emitting alpha kinetic energies here are calculated by the difference of the masses of the parent and daughter nuclei and the alpha particles. They are in closed agreement with the experimental observations. While the alpha radioactive life time are not the same order of magnitudes but give the same linearity on the logarithmic scale as function of the inverse square root of energy.
Digital Correlation of First Order Space Time in a Fluctuating Medium B. Santoso
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.119

Abstract

The study of fluctuating medium has been of great interest through the use of the correlation techniques A laser beam is known to form a coherent beam which  can be made to propagate within the fluctuating medium. This will allow the  study of the outgoing beam using digital correlation technique. Based on  the power spectrum, the integral transformation of the correlation function,  one can obtain for instance the radius and mass of the particles executing Brownian motion in the dispersed solution. To correlate the laser beam directly may not allow the detection of  signals by electronic means. A method of digitizing the light signals  by means of light beat heterodyne technique is  therefore adopted. The temporal and special correlation functions can be measured
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