ENTRY M0660 20050221 0000M066000000001
SUBENT M0660001 20050221 0000M066000100001
BIB 14 59 M066000100002
TITLE Laser transmutation of iodine-129. M066000100003
AUTHOR (J.MAGILL,H.SCHWOERER,F.EWALD,J.GALY,R.SCHENKEL, M066000100004
R.SAUERBREY) M066000100005
INSTITUTE (2ZZZITU,2GERJEU) M066000100006
REFERENCE (J,APPL/B,77,387,2003) M066000100007
FACILITY (LASER,3DDRJNA) Jena University multi TW laser M066000100008
system. M066000100009
INC-SOURCE (BRST) Very high intensity near-infrared laser M066000100010
radiation generate relativistic plasma, which emits M066000100011
high-energy beams of photons, neutrons, electrons, M066000100012
protons and ions. The ponderomotive force of intense M066000100013
light field, which is the light pressure of the M066000100014
pulse, accelerates the electrons to relativistic M066000100015
energies and pulses them in the forward direction M066000100016
into the target (iodine). Whithin the solid target M066000100017
of high atomic number (tantalum) the hot electrons M066000100018
are stopped and generate Bremsstrahlung. M066000100019
DETECTOR (GE) Two germanium detectors. M066000100020
METHOD (ACTIV) After irradiation, gamma-radiation from M066000100021
short-lived photoreaction products in the iodine M066000100022
(sample) and tantalum (electron source and M066000100023
electron-to-Bremsstrahlung converter) was detected. M066000100024
SAMPLE The iodine sample (21 g of PbI-2 with 17% of 129I) M066000100025
was plased behind the tantalum converter. M066000100026
ANALYSIS (DECAY) 129I was photo-excited to emit a single M066000100027
neutron and transmutate to 128I, which has a M066000100028
half-life of 25 min. 7% of the 128I nuclei capture M066000100029
an electron and decay to 128Te. The remaining 93% M066000100030
undergo beta-decay into the stable 126Xe. This M066000100031
beta-decay has a characteristic g-line at 443 keV M066000100032
with an emission probability of I-g = 17%, and is M066000100033
used to monitor successful photo transmutation. M066000100034
The procedure of 129I(g,n)128I estimation was the M066000100035
following. At first the photon spectrum n(E) of the M066000100036
laser in terms of a temperature and an absolute M066000100037
yield was determined. For this the additional data M066000100038
on the activation of the thermoluminescence M066000100039
spectrometers and of the tantalum Bremsstrahlung M066000100040
converter were used. At last this photon M066000100041
distribution was used to calculate the maximum (g,n) M066000100042
raction cross section value. M066000100043
ERR-ANALYS The maximum cross section value for the 129I(g,n)128I M066000100044
reaction was obtained to be accurate within a factor M066000100045
of two. For maximum cross section value obtained M066000100046
SIGMA = 220 mb. it means: SIGMA = 110 - 440 mb. M066000100047
STATUS (CURVE) The data from Fig.4 have been digitized at M066000100048
the Russia MSU SINP CDFE by V.V.Varlamov. M066000100049
COMMENT The first successful laser-induced transmutation of M066000100050
129I, one of the key radionuclides in the nuclear M066000100051
fuel cycle is reported. 129 I with a half-life of M066000100052
15.7 million years is transmutated into 128 I with a M066000100053
half-life of 25 min trough a (g,n) reaction using M066000100054
laser-generated Bremsstrahlung. The integral cross M066000100055
section value for the (g,n) reaction is determined. M066000100056
These experiments offer a new approach to studying M066000100057
transmutation reactions with neutral and charged M066000100058
particles without resiurce to nuclear reactors or M066000100059
particle accelerators. M066000100060
HISTORY (20041119C) M066000100061
ENDBIB 59 0 M066000100062
NOCOMMON 0 0 M066000100063
ENDSUBENT 62 0 M066000199999
SUBENT M0660002 20050221 0000M066000200001
BIB 1 1 M066000200002
REACTION (53-I-129(G,N)53-I-128,,SIG,,BRS) M066000200003
ENDBIB 1 0 M066000200004
NOCOMMON 0 0 M066000200005
DATA 2 27 M066000200006
EN DATA M066000200007
MEV MB M066000200008
9. 25.56 M066000200009
9.5 36.92 M066000200010
10. 42.6 M066000200011
10.5 51.12 M066000200012
11. 61.91 M066000200013
11.5 73.84 M066000200014
12. 92.58 M066000200015
12.5 113.6 M066000200016
13. 138.88 M066000200017
13.5 170.4 M066000200018
14. 197.66 M066000200019
14.5 215.8 M066000200020
15. 229. M066000200021
15.5 206.8 M066000200022
16. 184.6 M066000200023
16.5 153.36 M066000200024
17. 125. M066000200025
17.5 102.24 M066000200026
18. 88. M066000200027
18.5 71. M066000200028
19. 59.64 M066000200029
19.5 50. M066000200030
20. 42.46 M066000200031
20.5 35.22 M066000200032
21. 31.24 M066000200033
21.5 27.26 M066000200034
22. 13.86 M066000200035
ENDDATA 29 0 M066000200036
ENDSUBENT 35 0 M066000299999
ENDENTRY 2 0 M066099999999