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 : ri€tdiQn phin plin ftnS rfrng (2 (2 tti6m) 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
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