Pre-neutron-emission mass distributions for reaction238U(n, f) up to 60 MeV

  • The pre-neutron-emission mass distributions for reaction 238U(n, f) up to 60 MeV are systematically studied with an empirical fission potential model. The energy dependence of the peaks and valleys of the pre-neutron-emission mass distributions is described by an exponential form based on the newly measured data. The energy dependence of evaporation neutrons before scission is also considered, which plays a crucial role in the reasonable description of the mass distributions. The measured data of the pre-neutron-emission mass distributions for reaction 238U(n, f) are reasonably well reproduced up to 60 MeV. The mass distributions at unmeasured energies are also predicted using this approach.
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  • [1] Hahn O, Strassmann F. Naturwissenschaften, 1939, 27: 11-15[2] Randrup J, Mller P. Phys. Rev. Lett., 2011, 106: 132503[3] Lammer M. Proc. Fission Product Yields: Minor Actinides up to 150 MeV. Ed. Lammer M. Vienna: IAEA, 2008. 1[4] Ryzhov I V, Yavshits S G, Tutin G A et al. Phys. Rev. C, 2011, 83: 054603[5] Goutte H, Berger J F, Casoli P et al. Phys. Rev. C, 2005, 71: 024316[6] Vanin D V, Kosenko G I, Adeev G D. Phys. Rev. C, 1999, 59: 2114-2121[7] Karpov A V, Nadtochy P N, Vanin D V et al. Phys. Rev. C, 2001, 63: 054610[8] HU J M. Physics of Nuclear Fission. Beijing: Peking University Press, 1999. 133-211[9] Dubray N, Goutte H, Delaroche J P. Phys. Rev. C, 2008, 77: 014310[10] Younes W, Gogny D. Phys. Rev. C, 2009, 80: 054313[11] Mller P, Madland D G, Sierk A J et al. Nature, 2001, 409: 785-790[12] Mller P, Sierk A J, Iwamoto A. Phys. Rev. Lett., 2004, 92: 072501[13] Mller P, Sierk A J, Ichikawa T et al. Phys. Rev. C, 2009, 79: 064304[14] Randrup J, Mller P, Sierk A J. Phys. Rev. C, 2011, 84: 003461[15] Brosa U, Grossmann S, Müller A. Phys. Rep., 1990, 197: 167-262[16] Duijvestijn M C, Koning A J, Hambsch F J. Phys. Rev. C, 2001, 64: 014607[17] Koning A J, Hilaire S, Duijvestijn M C. TALYS-1.0. France: EDP Sciences, 2007. 211[18] LIU T J, SUN Z J. Proc. Fission Product Yields: Minor Actinides up to 150 MeV. Ed. Lammer M. Vienna: IAEA, 2008. 323[19] Katakura J. Proc. Fission Product Yields: Minor Actinides up to 150 MeV. Ed. Lammer M. Vienna: IAEA, 2008. 149[20] Wahl A C. Proc. Fission Product Yields: Minor Actinides up to 150 MeV. Ed. Lammer M. Vienna: IAEA, 2008. 117[21] Lammer M. Proc. Fission Product Yields: Minor Actinides up to 150 MeV. Ed. Lammer M. Vienna: IAEA, 2008. 253[22] LIU M, WANG N, LI Z X. Nucl. Phys. A, 2006, 768: 80-98[23] WANG N, LIU M, YANG Y X. Sci. China Ser. G, 2009, 52: 1554-1573[24] SUN X J, YU C G, WANG N. Phys. Rev. C, 2012, 85: 014613[25] Madland D G. Nucl. Phys. A, 2006, 772: 113-137[26] Shcherbakov O, Donets A, Evdokimov A et al. J. Nucl. Sci. Technol., 2002, 2(Supplement): 230-233[27] Lisowski P W, Gavron A, Parker W E et al. Fission cross section Ratios for 233,234,236U Relative to 235U from 0.5 10 400 MeV. Berlin: Springer, 1992. 732[28] Lisowski P W, Gavron A, Parker W E et al. Fission Cross Sections in the Intermediate Energy Region. Paris: OECD, 1991. 177[29] Simutkin V. Ph. D. Thesis, Acta Universitatis Upsaliensis, Uppsala, 2011. 35[30] Vivés F, Hambsch F J, Bax H et al. Nucl. Phys. A, 2000, 662: 63-92[31] Zller C. Seminar on Fission, Belgium: Pont d'Oye III Habayla-Neuve, 1995. 56
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SUN Xiao-Jun, YU Cheng-Gang, WANG Ning, YANG Yong-Xu and PAN Cheng-Hua. Pre-neutron-emission mass distributions for reaction238U(n, f) up to 60 MeV[J]. Chinese Physics C, 2015, 39(1): 014102. doi: 10.1088/1674-1137/39/1/014102
SUN Xiao-Jun, YU Cheng-Gang, WANG Ning, YANG Yong-Xu and PAN Cheng-Hua. Pre-neutron-emission mass distributions for reaction238U(n, f) up to 60 MeV[J]. Chinese Physics C, 2015, 39(1): 014102.  doi: 10.1088/1674-1137/39/1/014102 shu
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Received: 2014-03-24
Revised: 1900-01-01
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Pre-neutron-emission mass distributions for reaction238U(n, f) up to 60 MeV

    Corresponding author: SUN Xiao-Jun,

Abstract: The pre-neutron-emission mass distributions for reaction 238U(n, f) up to 60 MeV are systematically studied with an empirical fission potential model. The energy dependence of the peaks and valleys of the pre-neutron-emission mass distributions is described by an exponential form based on the newly measured data. The energy dependence of evaporation neutrons before scission is also considered, which plays a crucial role in the reasonable description of the mass distributions. The measured data of the pre-neutron-emission mass distributions for reaction 238U(n, f) are reasonably well reproduced up to 60 MeV. The mass distributions at unmeasured energies are also predicted using this approach.

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