بازده ایزوتوپی و نیمه عمر شکافت خودبخودی هسته ی فوق سنگین 284Fl

نوع مقاله: مقاله پژوهشی کامل

نویسندگان

1 عضو هیأت علمی دانشگاه مازندران

2 گروه فیزیک هسته ای ، دانشکده علوم پایه،دانشگاه مازندران ، بابلسر، ایران

10.22055/jrmbs.2019.14586

چکیده

در این پژوهش شکافت خودبخودی هسته ی فوق سنگین Fl284را با درنظر گرفتن پتانسیل کولنی و مجاورتی مورد مطالعه قرار داده ایم. انرژی تولید شده در هر شکافتگی Q، سد شکافت (V-Q)،نفوذپذیری، ثابت واپاشی و بازده شکافت رابرای هر شکافتگی محاسبه نموده ایم. با توجه به عدم تقارن جرم و بار شکافت پذیری مطلوب در شکافت خودبخودی برای بالاترین مقدار Q و کمترین مقدار (V-Q) حاصل می شود. برای شکافت خودبخودی این هسته بالاترین بازده برای شکافتگیِ منجر به ایزوتوپ Xe136 بعنوان یکی از پاره های شکافت بدست آمد. مقایسه ی بین بازده های نسبی شکافت برای جفت ایزوتوپ های تولید شده بعنوان پاره های شکافت نشان دهنده ی این است که هسته های جادویی دوگانه و لایه های بسته نزدیک به آنها دارای بیشترین بازده شکافت می باشند. ثابت واپاشی رابرای هر کدام از شکافتهای دوتایی بطور جداگانه محاسبه و با استفاده از مجموع آنها بعنوان ثابت واپاشی کل، نیمه عمر شکافت خودبخودی این هسته را بدست آورده و با داده های تجربی و نتایج حاصل از روابط نیمه تجربی مقایسه نموده ایم. این مقایسه نشان می دهد که نتایج حاصل از این روش محاسباتی نسبت به نتایج حاصل از روابط نیمه تجربی به داده های تجربی نزدیکتر است.

کلیدواژه‌ها


عنوان مقاله [English]

Isotopic yield and half-life for the spontaneous fission of 284Fl, superheahy nucleus

نویسندگان [English]

  • Mohammad Reza Pahlavani 1
  • Mahdi Joharifard 2
1 Faculty member, department of nuclear physics, faculty of basic science, university of mazandaran
2 Department of Nuclear Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar, Iran
چکیده [English]

IIn this research spontaneous fission of 284Fl superheavy nucleus has been studied using Coulomb and nuclear proximity potential. Released energy in each fragmentation Q, driving potential (V-Q), penetrability, decay constant and fission yield for each individual fragmentation are calculated. With respect to the mass and charge asymmetry, the most favorable fragmentation in the binary spontaneous fission occurs for the highest Q value and the lowest driving potential (V-Q). For spontaneous fission of 284Fl superheavy nucleus, the highest yield has been seen for 136Xe isotope (N = 82, Z = 54) as one of the Fragments. The comparison between relative yields shows the role of doubly magic and near doubly magic nuclei in having the highest fission yield. The spontaneous fission half-life of 284Fl superheavy nucleus are calculated by obtaining the total decay constant λ and compared with the results of semi empirical formula as well as experimental data. Satisfactory agreement achieved between the results of this approach and experimental data than the results of semi empirical formulas

کلیدواژه‌ها [English]

  • Spontaneous fission
  • Superheavy nuclei
  • Isotopic yield
  • Half-life
  • Fission barrier

 

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