TRT.IONG DH Stt PHAM TP.HCM KHOA vAr Lf K3 a- KrEM rRo 5nlTHuc Hec puAN @in l; M6n: phan ting h4t nh6n Lcrp: Cri nhan 4 Thoi gian: 90 phrit Bii l:-Cor ch6 phin_ ring h9t nh6n (2 tti6m) - Hdy trinh bdy d{c trmg chinh ctra ptran img hat nh6n hqp phAn vd phan ring truc ri6p. - Neu c6c ki6u ph6n rd co th€ "ria rrai nhan h;t;*;. ^^' Bni 3:Ti6tdiQn phin ftnS (2 tti6m) : ri€tdiQn plin rfrng (2 rli6m) , bi\ Yt"uj*"1,11 :!" plf uyg @'! khi chi6u chum neutron nhiQt len uiu ritr,ru,Sr-J ,ir,;. vcr d = 0,5 cm. BiEt 'a"e tict die";',i" phan ung u** iiJ",l;TTJ;J:,lx'i,tf;,'llll'i"l'1il:,lii ^- flE t l p=0,53g/cm3. tu lthierr lii Bii 4: Cdng thrfu Breit-Wigner (3 rti6m) Dt liQu thgc nghiQm titit dign toan phAn cria tuong t6c nz3s(J duoc cho trong hinh sau Bdri 2: Cric dinh tuar bllo toin (3 tti6m) c6c kh6i pho-t<ti (mass spectrometer) dang-lQch kh6ng the xrig dinh.du.oc klr6i luurrg ciic har nhan c6 thoi gian s5ng qu6 ngin, nh.mg .,n6 ngulen t6" "J tht xdc ainr., irroilrrong lrL vi6c. prrdn rfcrr ilQng hec cria phin tmg' Xdt .*o1in .q-nhi;eild;^ )G,"tio-,trong d6 A.* rdnhan s.ng 'gdrr c:irr riic dinh khdi lusns. Ta c6 th6 x6c rrinh kt'oir"qne ",i;;;il;h€nh rQch kh6i ruqng AE = (mn - mn )c2= r[t #)-r,(r. #).*J*;"o,,' vi AE rdt nh6 so vdi m1n€nc6 thO thay mn. = mn vddo d6ng ndng hic dAu, lfc sau cira ha1 rr. g6c tiin xa 0 ctah4t a ta s€ x6c dinh khoi lu.qn8 ctn A*. sri dsng iic., ,t.'r" o;i;""* tloi ti'h ch. cl6ng ndng c6c h4t li€n guil, hay ddn ra c6ng thric tr6n. ;-'E vrvu r'uv Prrr Lu( 6, ^L) pd ttri cho th6y 96 mSt cQng hucrng R tai dQng ndng neutron (kh6i tam) E, =l\eV uOi a.O rdng f =lA-2eV vd tii5t diQn toan pnan mri AO o,,* =9x1036. H6y su dgng th6ng tin ndy d6 tinh c6c tlQ rQng ri€ng phAn l,,lrd6i vOi c6c ph6n rd R -+ n+23" (J. vd R + y +nnU, gid sft 9ay li hai ki6u ph6n rd duy nh6t cria h4t nh6n n1,plT"Bj9,,rale d n6ng luqng thAp ndy, ta c6 th€ gia thiCt ct6y ld trudng hqp t6n xa cta c6c neutron s6ng s, vd (tl")' = 3,894.10-32 GbV2 m, ; fii,c, = 0,9396Ge V Kinc{ir crun-r.',, .,rn,li l,u n,o.r'ui'],.n.,,., I nt' Hinh; Ti€t di€n todn phin c,h<.t ttrtrnt tdc cua neutron vcti 23,e U. ( t-rich (jrrrlrir). vd Kinsey, (1976). Brookhaven Nation Laboratory). Sinh vian kh6ng s* dqtng tdi liQu Hct Cdn b0 coi thi kh6ng gffi thich gi thhm. ?l) t{) t(.x.) lJo bAyJ*OV . iiJ",l;TTJ;J:,lx'i,tf;,'llll'i"l'1il:,lii ^- flE t l p=0,53g/cm3. tu lthierr lii Bii 4: Cdng thrfu Breit-Wigner (3 rti6m) Dt liQu thgc nghiQm titit dign toan phAn cria tuong t6c nz3s(J duoc cho trong hinh. ndy, ta c6 th€ gia thiCt ct6y ld trudng hqp t6n xa cta c6c neutron s6ng s, vd (tl")' = 3, 894.1 0 -3 2 GbV2 m, ; fii,c, = 0, 939 6Ge V Kinc{ir crun-r.',, .,rn,li. TP.HCM KHOA vAr Lf K3 a- KrEM rRo 5nlTHuc Hec puAN @in l; M6n: phan ting h4t nh6n Lcrp: Cri nhan 4 Thoi gian: 90 phrit Bii l:-Cor ch6 phin_ ring h9t nh6n (2 tti6m) - Hdy trinh