~(236)Np全套中子数据更新评价
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摘要
裂变核全套中子评价数据为反应堆设计和安全运行、核燃料循环、估算高燃耗反应堆中次锕系核素的产生量及嬗变研究等提供重要的基础数据。本文基于全新的238Np中子光学模型势参数,对n+236Np核反应进行理论分析,并根据Np各同位素反应截面系统变化规律,对模型参数进行了调整,最后完成了全套中子数据的更新评价,与CENDL-3.1评价结果相比有较明显的改进。
The nuclear data with high accuracy for actinides play an important role in nuclear technology applications,including reactor design and operation,fuel cycle,and estimation of the amount of minor actinides in high burnup reactors and its transmutation.Based on a new set of neutron optical model parameter of 238Np and the systematic trend of the cross sections of different Np isotopes,a full set of 236Np neutron nuclear data were updated and improved by theoretical calculation.The present result has significant improvements over the data in CENDL-3.1.
The nuclear data with high accuracy for actinides play an important role in nuclear technology applications,including reactor design and operation,fuel cycle,and estimation of the amount of minor actinides in high burnup reactors and its transmutation.Based on a new set of neutron optical model parameter of 238Np and the systematic trend of the cross sections of different Np isotopes,a full set of 236Np neutron nuclear data were updated and improved by theoretical calculation.The present result has significant improvements over the data in CENDL-3.1.
引文
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[3]SHIBATA K,IWAMOTO O,NAKAGAWA T,et al.JENDL-4.0:A new library for nuclear science and engineering[J].Nucl Sci Tech,2011,48(1):1-30.
[4]KOSCHEEV V N.Evaluation of neutron nuclear data for ROSFOND-2010[R].[S.l.]:[s.n.],2006.
[5]OECD/NEA Data Bank:The JEFF-3.1.1nuclear data library,JEFF report 22[R].[S.l.]:[s.n.],2009.
[6]CHADWICK M B,HERMAN M,OBLOINSKY P,et al.ENDF/B-Ⅶ.1nuclear data for science and technology:Cross sections,covariances,fission product yields and decay data[J].Nucl Data Sheets,2011,112:2 887-2 996.
[7]China Nuclear Data Center.A brief description of the second version of Chinese evaluated nuclear data library CENDL-2.1[R].China:Nuclear Information Centre,1991.
[8]KUNZ P D.Zero range distorted wave Born approximation DWUCK4code[R].USA:University of Colorado,1994.
[9]ZHANG Jingshang.User manual of FUNF code[M].Beijing:Atomic Energy Press,2005.
[10]NAKAGAWA T,SHIBATA K.Japanese evaluated nuclear data library version 3 revision-2:JENDL-3.2[J].Nucl Sci Tech,1995,32:1 259-1 270.
[11]IWAMOTO O.Development of a comprehensive code for nuclear data evaluation,CCONE,and validation using neutron-induced cross sections for uranium isotopes[J].J Nucl Sci Technol,2007,44:687-697.
[12]LINDNER M,SEEGMILLER D W.Reactor neutron fission characteristics of the long lived isomer of neptunium 236[J].Radiochimica Acta,1990,49:1-12.
[13]JAFFEY A H,LERNER J L.Number of neutrons per fission,Argonne National Laboratory report series[R].US:Argonne National Laboratory,1961:124-130.
[14]GERASIMOV V F,DANICHEV V V.Measurement of transuranium isotopes fission cross section with lead neutron slowing-down spectrometer[C]∥Conf on Joint Inst for Nucl Res Dubna Reports,1997,97:348-360.
[15]DANON Y,MOORE M S,KOEHLER P E,et al.Fission cross-section measurements of the odd-odd isotopes 232Pa,238 Np,and 236 Np[J].Nucl Sci Eng,1996,124:482-491.
[16]VAL′SKIY G V,GROMOVA E A.Np-236neutron fission cross-section in the energy range up to 10keV[C]∥Int Conf on Neutron Physics.Kiev:[s.n.],1987:99-103.
[17]陈国长,于保生,曹文田,等.裂变核全套中子数据评价[J].原子能科学技术,2010,44(2):138-143.CHEN Guochang,YU Baosheng,CAO Wentian,et al.Neuron nuclear data evaluation for actinide nuclei[J].Atomic Energy Science and Technology,2010,44(2):138-143(in Chinese).
[18]CHEN Guochang,CAO Wentian,YU Baosheng,et al.Neutron nuclear data evaluation of actinide nuclei for CENDL-3.1[J].Chinese Physics C,2012,36(9):823-826.
[19]陈国长,曹文田,于保生,等.238 Np全套中子数据更新评价[J].原子能科学技术,2014,48(1):1-6.CHEN Guochang,CAO Wentian,YU Baosheng,et al.Updated neutron nuclear data evaluation for 238 Np[J].Atomic Energy Science and Technology,2014,48(1):1-6(in Chinese).
[20]BROWNE E,TULI J K.Nuclear data sheets for A=236[J].Nuclear Data Sheets,2006,107:2 695-2 696.
[21]RAYNAL J.Notes on ECIS94,CEA-N-2772[R].Saclay:Centre d′Etudes Nucleaires,1994.
[22]BRITT H C,WILHELMY J B.Simulated(n,f)cross sections for exotic actinide nuclei[J].Nucl Sci Eng,1979,72:222-232.