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1、1 31 ? 1 7 2007 c 7 ?p U ? n ? ? ? n HIGHENERGYPHYSICSANDNUCLEARPHYSICSVol. 31, No. 7 Jul., 2007?A?O?U?A?“9?A*+1;1)+f?1?2?u2?21 (”?nX”?467000)2 (=?y?nX=730000)?b!?!?N9,? ?HPGe ?13, 20?C?!?(?, l?O(?A?.?“(3)?uaq?A?O?.L2?(J9z?z?A?En/MeV/mbEn/MeV/mbReference128Te(n,2n)127mTe14.10.27376913.530.0888510511
2、4.60.38538214.300.09936107115.310.09937110114.40.3949150293Nb(n,2n)92mNb14.1459.39.22014.6459.713.820?z(References)1Bormann M, Bissen H H, Magiera E et al. Nucl. Phys.,1970, A157: 4812LU W D, Ranakumar N, Fink R W. Phys. Rev., 1970, C1:3503Husain L, Kuroda P K. Nucl. Phys., 1968, A114: 6634Filatenko
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5、ron Physics, 1987, 3: 29513Firestone R B, Shirley V S. Table of Isotopes. New York:John Wiley “(!?, , ?). ?n(11?).?fi: ?fU?, 1996. 9497)15LU Xi-Ting. Nuclear Physics(Revised Edition). Beijing:Atomic Energy Press, 2000. 2239 (in Chinese)628p U ? n ? ? ? n( HEP 1)ZHAI Zi-Nan1TUO Fei2LUO Jun-Hua2KONG X
6、iang-Zhong21 (Department of Physics, Pingdingshan University, Pingdingshan 467000, China)2 (Department of Modern Physics, Lanzhou University, Lanzhou 730000, China)AbstractAccording to the regulation of growing and decay of artificial radioactive nuclide, a formula used to calculatethe cross section
7、 of isomerous state with characteristic gamma-ray of ground state in a special case was deduced. Andthe cross sections of128Te(n,2n)127mTe reaction induced by neutrons around 14MeV were measured and calculated byusing the activation technique and the formula deduced above. The experimental results w
8、ere (73769) and (85382)mbat the neutron energies of (14.10.2) and (14.60.3)MeV, respectively. The samples wrapped in cadmium foil wereirradiated in order to avoid the effect of (n, ) reaction induced by thermal neutron. The neutron energies in thesemeasurements were determined by the method of cross
9、-section ratios between90Zr(n,2n)89m+gZr and93Nb(n,2n)92mNbreactions, and the neutron fluencies were determined by using the monitor reaction93Nb(n,2n)92mNb.Key wordsformula, reaction cross-section, tellurium, activation technique, neutronReceived 8 October 2006,Revised 31 October 2006*Supported by Scientific Research Start up Outlay of High-Position Talent in Pingdingshan University 1)E-mail:
