K3 a-

TRT.IONG DH Stt PHAM TP.HCM KHOA vAr Lf

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. rrai nhan h;t;*;. ^^' - Neu c6c ki6u ph6n rd co th€

"ria

Bdri 2: Cric dinh tuar bllo toin (3 tti6m)

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nhan c6 thoi gian s5ng qu6 ngin, nh.mg .,n6 ngulen t6" ilQng hec cria phin tmg' Xdt .*o1in .q-nhi;eild;^ )G,"tio-,trong d6 A.* rdnhan s.ng dinh khdi lusns. Ta c6 th6 x6c rrinh kt'oir"qne

rQch kh6i ruqng

",i;;;il;h€nh

AE = (mn - mn )c2= r[t #)-r,(r. #).*J*;"o,,'

c6c kh6i pho-t

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 ;-'E vrvu r'uv Prrr Lu( ndng c6c h4t li€n guil, hay ddn ra c6ng thric tr6n.

6, ^L)

: 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,;.

flE.-t

tict die";',i" phan ung u** iiJ",l;TTJ;J:,lx'i,tf;,'llll'i"l'1il:,lii tu lthierr lii

'a"e

vcr d = 0,5 cm. BiEt p=0,53g/cm3. l ^-

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 pd ttri cho th6y

?l)

t{)

t(.x.)

lJo

nt'

Kinc{ir crun-r.',, .,rn,li l,u n,o.r'ui'],.n.,,., I

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 li hai ki6u ph6n rd duy nh6t cria h4t nh6n 9ay 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

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).

Bni 3:Ti6tdiQn phin ftnS (2 tti6m)

Sinh vian kh6ng s* dqtng tdi liQu Cdn b0 coi thi kh6ng gffi thich gi thhm.

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