DSpace at VNU: Searching for photonuclear reaction on natural Ti with 65 MeV bremsstrahlung

VNU. JOURNAL OF SCIENCE, Mathematics - Physics, T.XXII, N04 , 20 06

SE A R C H IN G F O R P H O T O N U C L E A R R E A C T IO N O N N A T U R A L Ti
W IT H 6 5 M E V B R E M S S T R A H L U N G
N g u y e n T rung T in h
College o f Science, V N U
A b stra ct. Photonuclear reactions formed via the irradiation of bremsstrahlung
beam with end-point energy of 65 MeV from LINAC (Pohang, Korea) are
presented.

1. E x p e r im e n t
W ith h igh e n erg y beam from accelerator, m a n y rea ctio n s a p p e a r; th is is a very
good chance for p rodu ce rad io activ e isotopes. In th is p a p e r, som e p h otonu clear
reactions form ed via th e ir r a d ia tio n of b r e m s s tr a h lu n g b eam from LINAC (PohangKorea) are p re s e n te d .

1.1. I r r a d ia t io n
The 65 MeV b r e m s s tr a h lu n g w ere produced by b o m b a rd in g electron beam
(accelerated up to 65 MeV) in to T u n g s te n ta r g e t (W). T h is b r e m s s tr a h lu n g beam
was used to i r r a d i a t e a T i 0 2 pow der . The T i 0 2 pow der sa m p le w as con tain ed in a
cylinder w ith h = 5 m m , d = 10 mm. A sch em atic d ia g ra m of th e e x p e rim e n ta l set-up
is showed in Fig. 1.

F ig.l. A sc h e m a tic d ia g ra m of th e e x p e rim e n t a t LINAC, P o h a n g
The T 1 O 2 po w der w a s ir r a d ia te d for 2.0 h w ith 65 MeV b r e m s s tr a h lu n g beam
and pulse electro n b e a m w a s 40 mA. T he sam p le w a s fixed a t one position.
29


N guyen Trung Tinh

30

1.2 M easurem ent
- The decay tim e of irra d ia te d sam ple was from 2 to 60 h o u rs
- M easu rin g tim e v aried from 60 seconds up to 10 hours
- G am m a sp ectra w ere analysed by using gam m a vision p ro g ram
The irra d ia te d sam ple was m ea rsu red for 30 tim es, the following photopeaks
in keV were found in the photonuclear reactions for T i 0 2 (Table 1)
T a b l e 1. The photopeaks in photonuclear reactions for T i 0 2
NET, counts

Error, ±

CENTROID,
keV

1853597

352091

2758

54.54

2 70.70 79.44

836728

7125

1343

74.28

3 95.48 104.23

1161559

44717

1569

99.61

4 137.27 146.02

1477632

29363

1779

141.73

5 149.91 164.00

15936873

13850248

4711

159.63

6 166.91 180.03

1347746

232305

2079

175.53

7 216.96 225.71

686634

3128

1218

221.27

8 267.01 275.75

697042

67160

1196

271.63

9 314.62 323.37

718894

2952

1246

318.70

10 369.04 377.78

432011

86794

913

373.21

11 392.84 401.59

270861

8430

759

397.36

12 473.48 482.23

208231

8569

664

478.07

13 491.45 496.80

160825

1027

401

494.88

14 507.00 515.74

7242364

6018612

2944

511.51

15 560.43 569.17

107409

4489

476

564.57

16 589.57 598.31

108647

5395

478

593.85

17 613.37 622.11

141882

36673

514

618.00

18 716.33 725.07

113340

4749

489

720.71

19 885.32 894.06

159307

70925

512

889.69

20 904.74 913.48

88875

3837

433

909.45

21 930.47 939.21

103112

19743

447

934.85

22 979.51 988.25

496129

416443

767

984.03

23 1017.86 1026.60

54845

1316

342

1021.97

24 1033.89 1042.62

454850

390940

727

1038.08

25 1080.00 1088.74

41880

-202

301

1084.55

26 1117.87 1124.66

83062

53787

312

1121.08

Number, ROI-RANGE( keV)
1

46.40 62.92

GROSS,
counts


Searchin g fo r P h o to n u c le a r Reaction on..

31

27 1127.09 1133.40

28262

6196

188

1129.73

28 1152.82 1161.56

539954

486770

775

1157.46

29 1209.12 1217.86

20262

8846

183

1213.27

30 1293.09 1299.89

10202

517

122

1297.20

31 1301.83 1319.78

370635

349260

680

1312.37

32 1364.43 1373.17

4912

425

100

1369.11

33 1404.23 1412.96

5664

1471

102

1409.03

34 1456.64 1465.37

4685

1056

94

1460.99

35 1467.80 1474.59

2869

189

64

1471.00

36 1483.32 1492.06

3535

321

85

1487.70

37 1494.97 1503.70

6675

3502

101

1499.64

38 1520.20 1528.93

11990

9054

124

1524.79

39 1657.02 1671.09

8504

3684

151

1667.61

40 1726.40 1734.16

1216

40

46

1730.97

41 1739.01 1748.71

1484

42

60

1746.28

42 1761.81 1767.14

916

96

30

1763.98

43 1803.52 1813.23

1835

375

63

1807.69

44 1842.81 1850.58

1076

87

43

1846.88

45 1956.31 1964.07

1535

178

51

1960.68

£*•

â c q u tr v

Cmầtirtm

aglM J

Catautm/tm

n

a

JX[ Ari "tz

A

LÓdi

l

ỉ « VÉ OM

IfuS

A

I i'

0.01

QiBoUy

Ĩ

21:2ft4Ở
1 3 /0 1 /2 0 0 3

Lb*m 3600(100

FlMt.

3 7 .7 6 1 . BB

D ««ct

4 67

«

---- --- no I— "
f*— - —I

j jS U i
r ------ P m

Ic .........................-“1

*.1 _!r*sJ..jgjj

.Mi)
f... jl E G Ị Q O R T C C......I
L .w * d

pra^r
1640 ------ygtg-ọsr-"------ ~yrj&srissr
I A n é V m C o fn p M « d # » E : \ 5 cwc«f A n a M j # w r x V \ T n h 2 \ T a . U l o
0

ẼKpSỊI IỊwmmmI

w

10 24 48
0 » 0 1 /2 0 0 4

I

rL..i.,

Fig. 2. G a m m a sp e c tru m of 44Sc m easured by G am m avision S pectrom eter

2. R e su lts a n d d is c u s s i o n
A fter a n a ly s in g all the m earsu red spectra and com paring the analysised
d a ta w ith the d a ta of rad io isotopes, the following reactions were found:


Nguyen Trung Tinh

32

Ti(y,n) {for T i46}
Ti(y,2n) { for T i47}

ti(y,p) { for T i47, Ti48, Ti49, Ti50}-> Sc
fi(y,2p) { for T i49} -> C a47
fi(Y,pn) { for Ti46, T i48, Ti49, Ti50} -> Sc
fi(y,ap) { for Ti47, Ti48, Ti49, Ti50} -> K
The d a ta is su itab le w ith the reference d a ta .
This re s u lt can be used for:
N uclear d a ta (Cross-section)
N uclear s tru c tu re
N u clear a nalysis
Radioisotope production
R efe re n ce s

1.

Boston M., E r d u ra n M .N .,Sirin M. an d S u b a st M., Physical Review, 2,
(1997).

2

Kolev D., A ppl. R adiati. Isot, 8, (1998).

3.

Kolev D., Dobva E., Nenov N. an d Todorov V., N uclear instrum ents and
m ethods in p hysic reseach, 356, (1995).

4

A dnan A. Shihab-E ldin, Leslie J .J a r d in e , Ja g d ish K.Tuli, Andrey
B.Buyrn. Table o f Isotopes, U n iv e rs ity of California, Berkele, 1978.