27Al+n→28Al*→2Al+n B=v(2A)+m-M(2A)k9315M 26981539+1008665-27981905]×931.5MeV 7.731MeV E Atb m.+n1 27 Al(n, n"Al .>×0.040+7731 770(Mev 7.823MeV 7. 871 Mev E 155 7.880MeV 0100150200250300350400 E1o=7934MeⅤ E/kev Eao=8011 Mev 图9212A(n,n)2A的激发曲线 Ea=8.035 MeV E"=8.088MeVnAlAlnAl 27 28 27 +→→+ ∗ [ ( ) ( )] [ ] MeV731.7 981905.27008665.1981539.26 MeV5.931 Al MeV5.931Al 28 n 27 aA = = + − × = MmMB ×−+ ( ) MeV770.7 731.7040.0 271 27 aA Aa A 40 = +× + = + + = ∗ BE mm m E MeV088.8 MeV035.8 MeV011.8 MeV934.7 MeV880.7 MeV871.7 MeV823.7 370 315 290 210 155 145 95 = = = = = = = ∗ ∗ ∗ ∗ ∗ ∗ ∗ E E E E E E E