همجوشی و پراکندگی شبه‌الاستیک واکنش‌های یون سنگین6,7Li+144Sm و6,7Li+152Sm با استفاده از محاسبات کانال کوپل‌شده در اطراف سد کولنی

فریدون نژاد, راحله; صادقی, حسین

doi:10.22055/jrmbs.2021.16983

همجوشی و پراکندگی شبه‌الاستیک واکنش‌های یون سنگین6,7Li+144Sm و6,7Li+152Sm با استفاده از محاسبات کانال کوپل‌شده در اطراف سد کولنی

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

گروه فیزیک، دانشکده علوم پایه، دانشگاه اراک، اراک، ایران

10.22055/jrmbs.2021.16983

چکیده

در این مقاله، اثر برانگیختگی‌های چندفونونی در واکنش‌های همجوشی یون سنگین و توزیع سد همجوشی در انرژی‌های زیر سد برای واکنش‌های همجوشی 6,7Li+144,152Sm مطالعه و بررسی شده است؛ همچنین تابع برانگیختگی جزئی پراکندگی شبه-الاستیک و توزیع سد متناظر با آن برای واکنش‌های 6,7Li+144Sm در محاسبات کانال کوپل شده و با استفاده از پتانسیل مدل اپتیکی مورد بررسی قرار گرفته شده است. بررسی‌ها و مطالعات ما نشان داد که ساختار و تغییر شکل هستۀ پرتابه عامل مهمی در این محاسبات است. همچنین این بررسی‌ها نشان داد که برای واکنش 6Li+144Sm محاسبات CDCC تطابق خوبی با داده‌های تجربی دارد اما برای واکنش7Li+144Sm روش محاسبات CCFULL تطابق بهتری را نشان می‌دهد. به عنوان بهترین روش برای مطالعۀ رفتار سطح مقطع همجوشی در انرژیهای زیر سد کولنی، فاکتور اختر فیزیکی S(E) محاسبه شده است و از آن برای پیش بینی رفتار واکنش‌های 6,7Li+144,152Sm در بازه‌هایی از انرژی که آزمایش‌های تجربی قادر به اندازه گیری آن نیست، استفاده شده است. این نتایج مقدارهایی از انرژی که در آن S(E) بیشترین مقدار ممکن را دارد و مقدار فاکتور اختر فیزیکی در انرژی صفر برای این واکنش‌ها را پیش بینی می‌کند.

کلیدواژه‌ها

موضوعات

فیزیک هسته ای

عنوان مقاله [English]

Heavy-Ion Fusion and Quasi-Elastic Scattering Of 6,7Li+144Sm and 6,7Li+152Sm Reactions Using Coupled- Channel Calculation Around the Coulomb Barrier

نویسندگان [English]

Rahele Fereidonnejad
Hossein Sadeghi

Department of Physics, Faculty of Science, Arak University, Arak 8349-8-38156, Iran

چکیده [English]

In this work, the efficacy of fusion cross sections and barrier distributions of 6Li+144,152Sm and 7Li+144,152Sm reactions, as well as the large-angle partial quasi-elastic scattering excitation function and the corresponding barrier distribution for the 6,7Li+144Sm reactions in coupled channel calculation with optical model potential were studied. The results showed that the role of potential and the effect of projectile deformation in these calculations are important parameters. Investigation show that for 6Li+144Sm reaction CDCC calculation has a good agreement with experimental data and for 7Li+144Sm reaction, CCFULL calculation has a good agreement. Forasmuch as the best way to study the behavior of fusion cross section at low energies is the astrophysical S(E) factor, this quantity was used to predict the behavior of 6,7Li+144Sm and 6,7Li+152Sm reactions in energy intervals that the experiment could not be measured. This result predicts the value of energy that the astrophysical S(E) factor had a maximum value, and find the value of S- factor for 6,7Li+144Sm, 6,7Li+152Sm reactions at zero energy by the extrapolation method.

کلیدواژه‌ها [English]

heavy ion reaction
coupled channel calculation
optical model potential
fusion cross section
fusion barrier distribution
quasi-elastic scattering

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