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Investigations on ternary photo-fission by means of plastic and mica track detectors

Исследование тройного фотоделения применением пластмассовых и слюдяных диэлектрических детекторов

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Acta Physica Academiae Scientiarum Hungaricae

Abstract

The aim of the present investigations was to obtain data for the ternary photo-fission of232Th,238U and239Pu induced by 27,5 MeV bremsstrablung. Sandwiches, made of solid-state track detectors, were used for the detection of the binary and ternary fissions. For the purposes of distinguishing between symmetrical and asymmetrical ternary fission events, our investigations were carried out simultaneously with two track detectors (mica and plastics) with different registration thresholds. The experimental methodology, i.e. the preparation of the sandwiches, the method of angle and range measurement and track evaluation are described. About 1.5 million binary fission events were scanned. Data are given for the frequency of occurrence of three-prong and two-prong events with a spatial angle of less than 165°. Data are also presented for the angular and range distributions measured for these events. The possible disturbing scattering phenomena and the methods of eliminating them are discussed. It has been established that the ratio of symmetrical ternary-fission events (the mass of each fragment being >30) to binary fission events, in the case of332Th,238U and230Pu are ∼8·10−6, ∼11·10−6 and <3·10−6, respectively. The relative frequency of occurrence of asymmetrical ternary fissions (the mass of one of the fragments being between 10 and 30) seems to be several times more.

Резюме

Целью наших исследований является получение данных о тройном фотоделении ядер232Th,238U и239Pu при облучении тормозным излучением электронов с энергией 27,5 Мэв.

Для обнаружения двойных и тройных делений использовался сандвич из диэлектрических детекторов. Для того, чтобы различить случаи симметричного и асимметричного тройного деления, измерения проводились одновременно двумя диэлтрическими детекторами (слюдяным и пластмассовым) разной чувствительности. Подробно обсуждаются: методика эксперимента, изготовление сандвича, измерение угла и пробега и обработка следов. Было проверено почти 1,5 миллиона слевод двойного деления. Сообщаются данные о вероятности обнаруженных тройных и двойных событий с углом меньше 165°, а также о распределении таких событий по углу и пробегу.

Подробно обсуждаются причины возможных ошибок и способы их устранения.

Было определено, что относительная вероятность симетричных тройных делений (масса всех продуктов больше 30-и) по отношению кдвойному ∼8·10−6, ∼11·10−6 и <3·10−6 для ядер232Th,238U и239Pu соответственно. Относительная вероятность асимметричных тройных делений (масса одного продукта в пределах 10–30) несколько больше.

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References

  1. R. D. Present andJ. K. Knipp, Phys. Rev.,57, 751, 1940.

    Article  ADS  Google Scholar 

  2. W. J. Swiatecki, Paper P/651, Proc. of the 2. UN Conference on the Peaceful Uses of Atomic Energy,15, Geneva, 1958.

  3. V. M. Strutinski, N. Ya. Lyashchenko andN. A. Popov, J. Exp. Theor. Phys.,43, 2, 584, 1962.

    Google Scholar 

  4. Gy. Somogyi, ATOMKI Közl.,9, 297, 1967.

    Google Scholar 

  5. P. B. Price, R. L. Fleischer, R. M. Walker andE. L. Hubbard, Proc. of 3. Conference on Reactions between Complex Nuclei. Univ. of California Press, Berkeley, 332, 1963.

    Google Scholar 

  6. R. Brandt, Nucleonik,8, 235, 1966.

    Google Scholar 

  7. R. Brandt et al., Nucl. Phys.,A90, 177, 1967.

    Article  Google Scholar 

  8. M. Debeauvais, R. Stein, J. Ralarosy andP. Cüer, Nucl. Phys.,A90, 186, 1967.

    Article  Google Scholar 

  9. M. Debeauvais, R. Stein, G. Remy andJ. Ralarosy, J. Phys.,29, Colloque Cl. Suppl. No 1. 127, 1968.

    Google Scholar 

  10. E. Cieslak, J. Piekarz, J. Zakrzewski, M. Dakowski, H. Piekarz andM. Sowinski, Nucl. Instr. Meth.,39, 224, 1966.

    Article  Google Scholar 

  11. M. Debeauvais, R. Stein, G. Remy andJ. Ralarosy, C. R. Acad. Sc. Paris,263, 398, 1966.

    Google Scholar 

  12. H. Gerhardt, F. Gönnenwein, A. Heinrich andH. Hipp, VI. Intern. Conf. on Corp. Phot. Florence, July, 19–23, 1966. C. E. P. I. Roma. p. 454.

  13. V. P. Perelygin, S. P. Tretiakova, N. H. Shadieva, A. H. Boos andR. Brandt, Preprint E7-4140, Dubna, 1968.

  14. S. W. Cospar, J. Cerny andR. C. Gatti, Phys. Rev.,154, 1193, 1967.

    Article  ADS  Google Scholar 

  15. G. M. Raisbeck andT. D. Thomas, Phys. Rev.,172, 1272, 1968.

    Article  ADS  Google Scholar 

  16. V. N. Andreev, V. G. Nedopekin andV. I. Rogov, Yad. Fiz.,8, 38, 1968.

    Google Scholar 

  17. M. K. Juric, Bull. Boris Kidrich. Nucl. Sci.,15, 217, 1964.

    Google Scholar 

  18. J. Benisz andT. Panek, Institute of Nucl. Phys., Cracow, Report No. 529/Pl. 1967.

  19. M. L. Muga, C. R. Rice andW. A. Sedlacek, Phys. Rev.,161, 1266, 1967.

    Article  ADS  Google Scholar 

  20. L. Katz, A. P. Baerg andF. Brown, Paper P/200 in Proc. of the 2. UN Conference on the Peaceful Uses of Atomic Energy,15, Geneva, 1958.

  21. R. L. Fleischer, P. B. Price, R. M. Walker andE. L. Hubbard, Phys. Rev.,156, 353, 1967.

    Article  ADS  Google Scholar 

  22. P. B. Price, D. D. Peterson, R. L. Fleischer, C. O’Ceallaigh, D. O’Sullivan andA. Thompson, Can. J. Phys.,46, S1150, 1967.

    Google Scholar 

  23. R. L. Fleischer, P. B. Price, R. M. Walker andE. L. Hubbard, Phys. Rev.,133A, 1443, 1964.

    Article  ADS  Google Scholar 

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Authors and Affiliations

  1. Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen

    L. Medveczky & G. Somogyi

  2. Fachbereich Angewandte Physik der Friedrich schiller Universität, Jena, GDR

    G. Götz

Authors
  1. L. Medveczky
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  2. G. Somogyi
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  3. G. Götz
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Dedicated to Prof.A. Szalay on his 60th birthday.

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Medveczky, L., Somogyi, G. & Götz, G. Investigations on ternary photo-fission by means of plastic and mica track detectors. Acta Physica 28, 169–184 (1970). https://doi.org/10.1007/BF03055160

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  • DOI: https://doi.org/10.1007/BF03055160

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