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)127mTe14.10.27376913.530.08885105114.60.38538214.300.09936107115.310.09937110114.40.3949150293Nb(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: 6634Filatenkov A A, Chuvaev S V, Aksenov V N et al. KhlopinRadium Institute Report RI-252, St Petersburg, 19995Brzosko J, Ecowski P, Siwek-diament K et al. Nucl. Phys.,1965, 74: 4386Majumdar N K, Chatterjee A. Nucl. Phys., 1963, 41: 1927Bonazzola G C, Brovetto P, Chiavassa E et al. Nucl. Phys.,1964, 51: 3378Hasan S S, Prasad R, Seghal M L. Nucl. Phys., 1972, A181:1019Levkovskiy V N, Artemev O I. YF, 1971, 13(5): 92310Struwe W, Winkler G. Nucl. Phys., 1974, A222: 60511Brzosko J, Decowski P, Siwek-diament K et al. Nucl. Phys.,1963, 45: 57912Gopych P M, Demchenko M N, Zalyubovskiy I I et al.I.Int.Conf.on Neutron 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 Xiang-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 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 were (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-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:zfqpdsu.edu.cn