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Determination of the neutrino mass through the study of the energy spectrum of radiation of Strontium-90 isotope

تحديد كتلة النترينو بدراسة طيف أشعة بيتا السالبة لنظير السترونسيوم–90

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 Publication date 2015
and research's language is العربية
 Created by Shamra Editor




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In this work, using a scintillation detector with Strontium-90 source as a try to measure the electronic neutrino mass from a simple technique and different from what is used in this area where current techniques used are very complex and require substantial amounts. Also, detector calibration (to find the straight calibration equation), in addition to identified the maximum energy of β- particles (electrons), experimentally, by selection the channel number and then finding the energy value from the calibration equation (as a straight line). We have studied the disintegration changed energy with absorbent material which is an aluminum slices that have different thickness. We have observed the decrease in the values of the maximum energy of the electrons with increases the thickness of the slices. The energy changes with thickness as: E = f (x), (a straight line have a negative inclination). Applying Fermi 's theory and Kurie's plot allowed to find the maximum energy of disintegration electrons (1697,58 keV), this value is so close to experimental value (1653,45 keV), with dubity (2,6%) We have found that the electronic mass neutrino mass is almost to be non-existent, or we can said that the Strontium-90 disintegration does not allow to measure mass neutrino mass accurately, this is due to the high value of the disintegration energy of the Strontium- 90 isotope.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة محاولة قياس كتلة النترينو الإلكتروني باستخدام كاشف وميضي ومنبع السترونسيوم-90. تعتمد الطريقة المستخدمة على تقنية بسيطة مقارنة بالتقنيات المعقدة والمكلفة الحالية. تم معايرة الكاشف وتحديد الطاقة العظمى لجسيمات بيتا الناتجة عن تفكك السترونسيوم-90. كما تمت دراسة تأثير سماكة مادة ماصة (صفائح الألمنيوم) على الطاقة العظمى للإلكترونات. باستخدام نظرية فيرمي ومخطط كوري، تم تحديد الطاقة العظمى للإلكترونات الناتجة عن التفكك (1697.58 keV) والتي كانت قريبة من القيمة التجريبية (1653.45 keV) مع خطأ يقدر بـ 2.6%. وخلصت الدراسة إلى أن كتلة النترينو الإلكتروني معدومة تقريباً، أو أن تفكك السترونسيوم-90 لا يسمح بقياس كتلة النترينو بدقة بسبب القيمة الكبيرة لطاقة تفكك هذا النظير المشع. توصي الدراسة بإجراء تجارب مماثلة مع منابع مشعة ذات طاقة تفكك صغيرة لقياس كتلة النترينو بدقة أكبر.
Critical review
دراسة نقدية: تعتبر هذه الدراسة خطوة مهمة نحو تبسيط تقنيات قياس كتلة النترينو الإلكتروني، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، استخدام منبع السترونسيوم-90 ذو طاقة تفكك عالية قد يكون غير مثالي لقياس كتلة النترينو بدقة. يمكن تحسين النتائج باستخدام نظائر مشعة ذات طاقة تفكك أقل. ثانياً، الدراسة تعتمد بشكل كبير على دقة المعايرة والتقنيات المستخدمة، مما قد يؤثر على النتائج النهائية. وأخيراً، كان من الممكن تقديم تحليل أعمق للبيانات التجريبية لتقليل نسبة الخطأ. بشكل عام، الدراسة تفتح آفاقاً جديدة ولكن تحتاج إلى تحسينات لضمان دقة النتائج.
Questions related to the research
  1. ما هي التقنية المستخدمة في هذه الدراسة لقياس كتلة النترينو الإلكتروني؟

    تم استخدام كاشف وميضي ومنبع السترونسيوم-90 لقياس كتلة النترينو الإلكتروني باستخدام تقنية بسيطة مقارنة بالتقنيات المعقدة والمكلفة الحالية.

  2. ما هي النتائج الرئيسية التي توصلت إليها الدراسة بشأن كتلة النترينو الإلكتروني؟

    خلصت الدراسة إلى أن كتلة النترينو الإلكتروني معدومة تقريباً، أو أن تفكك السترونسيوم-90 لا يسمح بقياس كتلة النترينو بدقة بسبب القيمة الكبيرة لطاقة تفكك هذا النظير المشع.

  3. ما هو تأثير سماكة مادة الألمنيوم الماصة على الطاقة العظمى للإلكترونات؟

    لوحظ أن الطاقة العظمى للإلكترونات تتناقص بزيادة سماكة صفائح الألمنيوم، وتغير الطاقة بتابعية السماكة يمثل خط مستقيم ميله سالب.

  4. ما هي التوصيات التي قدمتها الدراسة لتحسين قياس كتلة النترينو؟

    توصي الدراسة بإجراء تجارب مماثلة مع منابع مشعة ذات طاقة تفكك صغيرة حيث إن النسبة (-2@4 m2c) تأخذ قيماً غير مهملة بهدف قياس كتلة النترينو بدقة أكبر.


References used
W. Pauli, Letter written on December 4, 1930 in Zurich to the participants of a physics meeting in T¨ubingen., Reprinted in Collected Scientific Papers by Wolfgang Pauli (R. Kronig, V. F. Weisskpf, eds.), New York : Wiley-Interscience Vol. II (1964), 1316
H. V. Klapdor-Kleingrothaus, A. Staudt, TeilchenphysikohneBeschleuniger, B.G. Teubenr Stuttgart 1995, NAUKA-FIZMATLIT, Moscow, 1997 (Russian), Transl. by V. A. Bednyakov
F. Boehm, P. Vogel, Physics of massive neutrinos, Cambridge University Press, 1987, Mir, Moscow, 1990 (Russian), Transl. by B. M. Novikov
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