First total absorption spectrometry measurement of the β ...Decay heat Beta and gamma energy...
Transcript of First total absorption spectrometry measurement of the β ...Decay heat Beta and gamma energy...
Aleksandra FijałkowskaFaculty of Physics, University of Warsaw
M. Karny, K.P. Rykaczewski, M. Wolińska-Cichocka, B.C. Rasco,R. Grzywacz, C.J. Gross, J.W. Johnson, D. Miller, E.F. Zganjar,R. Goans, K.C. Goetz, J.H. Hamilton, C. Jost, M. Madurga,K. Miernik, S.W. Padgett, S.V. Paulauskas, A.V. Ramayya, D. Stracener
06.06.2014 ARIS, Tokyo
First total absorption spectrometry measurement of the β-decay of Xe139
Decay heat
Beta and gamma energy released by the decay of fission products
Ei - mean decay energy
of nucleus i ( β and γ)
λi - decay constant
Ni(t) - number of nuclei i at time t
A. Algora et al., PRL 105, 202501 (2010)A. Tobias, CEGB Report No. RD/B/6210/R89, 1989
Gamma component of 239Pu decay heat
Decay heat
Beta and gamma energy released by the decay of fission products
Ei - mean decay energy
of nucleus i ( β and γ)
λi - decay constant
Ni(t) - number of nuclei i at time t
Radionuclides recommended for TAGS measurementsAssessment offission product, decay data for decay heat calculations, T. Yoshida, A.L. Nichols, OECD NEA, 2007+ Neutron-induced Cummulative Fission Yields (235U)
86 Br 1.6 %87 Br88 Br89 Kr 4.5 %90 Kr98 Nb99 Nb100 Nb
101 Nb 103 Mo105 Mo 102 Tc 103 Tc104 Tc 105 Tc 106 Tc
132 Sb136 I137 I137 Xe139 Xe 5.0 %140 Xe
} B. C. Rasco, β-γ and β-n-γ Emission in Mass A=137 Decay ChainStudied with the Modular Total Absorption Spectrometer (MTAS)
Iiβ
Iiγ in
Iiγ 0ut
i
High efficiency total absorption
γ-spectroscopy
High energy resolution γ-spectroscopy
Parent nucleus
Daughter nucleus
Pandemonium EfectJ. C. Hardy et al., Physics Letter B 71 (1977) 307-310
Compete β-feeding pattern
High efficiency spectrometry
Eγ≈ Ei .Iiβ Σ
Gamma and beta average energy per decay
Beta strength function
Total Absorption Spectrometry, Co spectrum
Source
5+ 0.0 1925.28 d
%B– =100
62
07Co33
Q–=2823.95
0+ 0.0
2+ 1332.50814.702u0.12
2+ 2158.61≥14.02u0.000
4+ 2505.7487.51299.88
L og ftI β–
1332
.492
E2
99.9
826
826.
10 D
+Q
0.00
76
2158
.57
0.00
12
347.
14
0.00
75
1173
.228
E2(
+M3)
99
.85
2505
.692
E4
0.00
0002
0
62
08N i32
1172 keV1332 keV
2505 keV
10
100
1000
10000
100000
500 1000 1500 2000 2500
Counts
per
10 k
eV
Energy [keV]
60
Modular Total Absorption Spectrometer (MTAS)
Carbon fiber
Silicon putty
NaI
Teflon
Steel19 hexagonal NaI crystals. Diameter: 8” length: 21” each.
Simulated full energy gamma ray efficiency for Central detector, Inner ring, and all MTASfor complete MTAS array.
M. Wolińska-Cichocka, Testing the on-line response of Modular TotalAbsorption Spectrometer: 142Ba → 142La → 142Ce decay chain, ARIS2014
January 2012Holifield Radioactive Ion Beam Facility
Experiment
MTASGe
Mass separatorM/ΔM~600
Tandem40Mev
Proton beam
Ion source
238
UCx
Fission product
Two 1 mm thick silicon strip detectors placed around the tape transporting collected activity.
Measurement cycle:1. Sample impantation2. Waiting3. Activity transportation4. Measurement5. Second transportation
Br86
1
10
100
1000
10000
0 1000 2000 3000 4000 5000 6000 7000 8000
Counts
per
keV
Energy [keV]
7.6
MeV
86Br
(2– ) 0.0 55.0 s
%B– =100
83
65Br51
Q– (g.s.)=762611
0+ 0.09.71u15
2+ 1564.617.110
2+ 2349.787.34.9
(2,3)+ 2850.467.33.1
(2)+ 2926.327.22.8
3– 3098.987.14.8
3334.29.21.2
(3– ) 4316.165.451
(1,2) 5406.86.12.9
(1– ,2– ) 5518.85.82.7
(1,2) 6161.76.70.07
(1,2) 6210.15.02.1
(1,2) 67226.2≈0.05
(1,2) 6768.65.70.10
L og ftI β–
1564
.64
65
785.
17
4.5
2349
.6
9.8
499.
2 1.
2
1285
.89
7.5
1361
.68
10.3
2926
.1
2.5
749.
5 0.
72
1534
.7
10.4
1769
.6
1.2
1217
.24
6.0
1389
.79
10.1
1465
.2
5.7
1966
.4
7.5
2751
.3
225406
.5
4.4
5518
.6
2.7
6161
.5
0.07
803.
3 2.
9
6210
.4
0.65
6722
≈0.0
46
6768
.3
0.10
83
66K r50
Peaks in MTAS spectrum correspond to the levels being fed, NOT to the individual gamma transitions.
10%51%
6%14 levels22 gamma transitions
Decay scheme modification
Assumptions:1. Decay scheme is completed up to Ecut energy2. Above Ecut pseudo-levels every 100 keV, up to Qβ
3. Only allowed Gamow-Teller transitions (level density formula - A. Gilbert, A. G. W. Cameron, Can. Jurn. of Phys. 43 (1965))4. Pseudo-levels deexcite to "known" levels.5. Only E1, M1 and E2 transitions
Ecut
(2– ) 0.0 55.0 s
%B– =100
83
65Br51
Q– (g.s.)=762611
0+ 0.09.71u15
2+ 1564.617.110
2+ 2349.787.34.9
(2,3)+ 2850.467.33.1
(2)+ 2926.327.22.8
3– 3098.987.14.8
3334.29.21.2
(3– ) 4316.165.451
(1,2) 5406.86.12.9
(1– ,2– ) 5518.85.82.7
(1,2) 6161.76.70.07
(1,2) 6210.15.02.1
(1,2) 67226.2≈0.05
(1,2) 6768.65.70.10
L og ftI β–
1564
.64
65
785.
17
4.5
2349
.6
9.8
499.
2 1.
2
1285
.89
7.5
1361
.68
10.3
2926
.1
2.5
749.
5 0.
72
1534
.7
10.4
1769
.6
1.2
1217
.24
6.0
1389
.79
10.1
1465
.2
5.7
1966
.4
7.5
2751
.3
225406
.5
4.4
5518
.6
2.7
6161
.5
0.07
803.
3 2.
9
6210
.4
0.65
6722
≈0.0
46
6768
.3
0.10
83
66K r50
Qβ
Br86
average gamma energy increasedfrom 3259 keV to 3712 keV (14%)
Counts
per
10 k
eV
1
10
100
1000
10000
0 1000 2000 3000 4000 5000 6000 7000 8000
Energy [keV]
7.6
Me
V
86Br
Ecu
t
20
40
60
80
100
0 1000 2000 3000 4000 5000 6000 7000 8000
Cum
ula
ive f
eedin
g (
%)
Energy [keV]
Q =
7.6
3 M
eV
86Br
Br, gamma spectrum86C
ounts
per
10 k
eV
1
10
100
1000
10000
0 1000 2000 3000 4000 5000 6000 7000 8000
Energy [keV]7.6
MeV
86Br
Xe139
63 levels263 gamma transitions
1CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
3/2,5/2,7/2+ 646.528.20.334380
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 891.587.61.1
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
3/2,5/2,7/2+ 1020.307.51.16
3/2,5/2,7/2+ 1215.028.10.22
1395.257.90.34
1461.317.40.86
1599.997.70.38
1652.757.01.7
1693.927.70.35
1738.697.11.29
1793.2
1831.47.60.32
2099.627.60.27
3/2,5/2,7/2+ 2103.8
2119.647.20.6
1/2,3/2,5/2 2372.957.00.71
3/2,5/2,7/2+ 2423.5≥7.5≤0.20
1/2,3/2,5/2 2586.066.70.98
2727.637.30.20
1/2,3/2,5/2 2967.466.50.81
1/2,3/2,5/2 2980.457.20.15
3/2,5/2 3130.337.00.16
3/2,5/2 3146.77.30.09
3/2,5/2 3156.087.10.14
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3375.406.40.41
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3776.006.20.21
1/2,3/2,5/2 3815.236.50.10
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
1149
.2
0.14
0
1765
.2
0.05
0
2761
.6
0.06
7
2736
.7 &
0.
12
2736
.7 &
0.
12
2911
.7
0.06
7
3130
.6
0.08
2255
.3
0.09
0
3146
.6
0.06
2
783.
1 0.
062
1036
.3
0.12
3
3156
.3
0.04
5
1608
.7
0.09
5
2693
.4
0.07
8
2815
.03
0.22
1273
.1
0.04
5
1911
.42
0.11
8
2430
.3
0.03
9
2640
.1
0.03
4
1543
.6
0.02
8
1681
.1
0.19
1722
.6
0.10
6
3375
.51
0.15
1
1711
.44
0.28
1851
.8
0.09
5
2613
.7
0.03
4
2989
.4
0.07
3
3110
.8 &
0.
039
3110
.8 &
0.
039
3214
.8
0.03
9
3504
.7
0.06
71017
.7
0.09
0
1641
.7
0.15
7
2006
.8
0.11
2
2854
.2
0.09
0
1351
.6
0.09
5
2769
.32
0.30
2872
.65
0.12
3
3168
.7
0.06
2
957.
3 0.
067
2903
.8
0.07
8
2918
.3
0.12
1803
.99
0.11
2
2832
.8
0.06
2
135
95Cs84
2CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02 (continued)
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
3/2,5/2,7/2+ 646.528.20.334380
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 891.587.61.1
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
3/2,5/2,7/2+ 1020.307.51.16
1139.11
1395.257.90.34
1508.247.90.24
1599.997.70.38
1652.757.01.7
1693.927.70.35
1738.697.11.29
3/2,5/2,7/2+ 1816.5≥8.0≤0.15
3/2,5/2,7/2+ 2063.607.20.6
1/2,3/2,5/2 2185.586.52.1
3/2,5/2 2304.716.43.0
1/2,3/2,5/2 2586.066.70.98
1/2,3/2,5/2 2620.606.80.79
2727.637.30.20
3/2,5/2 2754.136.90.45
1/2,3/2,5/2 2797.556.51.10
1/2,3/2,5/2 2852.317.20.18
3/2,5/2 2936.847.00.24
1/2,3/2,5/2 2967.466.50.81
3/2,5/2 3130.337.00.16
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme (continued)
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
847.
45
0.26
1190
.6
0.08
1579
.5
0.20
1939
.5
0.09
5
2192
.32
0.34
2366
.97
0.13
4
926.
8 0.
034
967.
3 0.
067
1022
.0
0.03
9
1481
.5
0.06
7
1613
.8
0.26
2227
.28
0.37
1219
.33
0.19
2437
.8
0.09
5
937.
9 0.
067
1615
.0
0.16
1862
.4
0.07
3
2021
.8
0.10
1
2238
.4
0.15
2464
.6
0.11
2
2535
.0
0.06
2
2754
.2
0.06
7
1776
.9
0.18
5
1790
.85
0.43
1854
.5
0.13
2403
.75
0.26
2507
.6
0.07
8
2578
.9
0.06
2
1199
.43
0.18
2633
.75
0.10
6
1428
.70
0.18
5
2936
.2
0.05
6
1228
.8
0.07
8
1458
.98
0.25
1830
.2 @
0.
078
2025
.1
0.05
6
2451
.6
0.04
5
2574
.04
0.34
135
95Cs84
3CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02 (continued)
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
3/2,5/2,7/2+ 646.528.20.334380
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 891.587.61.1
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
3/2,5/2,7/2+ 1020.307.51.16
1037.278.20.23
1139.11
3/2,5/2,7/2+ 1215.028.10.22
1395.257.90.34
1508.247.90.24
1599.997.70.38
1652.757.01.7
1738.697.11.29
1831.47.60.32
1/2,3/2,5/2 2185.586.52.1
3/2,5/2 2304.716.43.0
3/2,5/2 2328.776.42.7
1/2,3/2,5/2 2372.957.00.71
3/2,5/2,7/2+ 2423.5≥7.5≤0.20
2432.447.30.31
3/2,5/2 2510.466.51.84
2727.637.30.20
1/2,3/2,5/2 2852.317.20.18
3/2,5/2 2936.847.00.24
3/2,5/2 3130.337.00.16
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme (continued)
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
119.
4 1.
5
1297
.85
0.44
2015
.11
0.17
4
2085
.91
0.63
2304
.97
0.29
589.
8 0.
084
675.
79
0.16
2
820.
5 0.
078
1115
.0 &
0.
17
1291
.4
0.17
1309
.4
0.33
1386
.19
0.52
1814
.1
0.12
3
1935
.1 &
0.
112
1935
.1 &
0.
112
2039
.1
0.07
8
2110
.12
0.34
2328
.80
0.63
634.
2 0.
034
719.
8 0.
07
1233
.8
0.03
9
1857
.6
0.11
2
1979
.57
0.52
1416
.94
0.16
2204
.6
0.04
5
2423
.6
0.04
5
832.
41
0.07
3
1540
.1
0.06
2
1700
.2
0.16
1786
.6
0.06
2
772.
0 0.
056
1490
.0
0.21
1503
.1
0.20
2
1862
.4
0.30
1994
.2
0.08
4
2116
.88
0.32
2291
.61
0.40
2510
.41
0.27
135
95Cs84
4CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02 (continued)
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
595.43≥8.2≤0.37
3/2,5/2,7/2+ 646.528.20.334380
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
3/2,5/2,7/2+ 1020.307.51.16
1139.11
3/2,5/2,7/2+ 1215.028.10.22
1411.7≥8.3≤0.11
1599.997.70.38
1693.927.70.35
1718.437.50.57
1721.94
1738.697.11.29
1793.2
3/2,5/2,7/2+ 1816.5≥8.0≤0.15
1831.47.60.32
3/2,5/2,7/2+ 2063.607.20.6
2099.627.60.27
3/2,5/2,7/2+ 2103.8
2119.647.20.6
1/2,3/2,5/2 2185.586.52.1
1/2,3/2,5/2 2372.957.00.71
3/2,5/2 2510.466.51.84
1/2,3/2,5/2 2586.066.70.98
2727.637.30.20
1/2,3/2,5/2 2852.317.20.18
3/2,5/2 2936.847.00.24
3/2,5/2 3130.337.00.16
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme (continued)
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
960.
6 0.
056
1178
.73
@
0.34
1299
.8
0.05
0
1404
.16
0.12
9
579.
4 0.
056
986.
02
0.30
1324
.38
0.21
1126
.5
1344
.93
@
1.01
1344
.93
@
0.10
1
1449
.0
0.14
0
1520
.17
0.71
786.
7 0.
022
1793
.0
0.06
2
1817
.6
0.15
1
888.
6 0.
067
1316
.4
0.15
1
1437
.7
0.11
1612
.4
0.15
924.
5 0.
162
1416
.5
0.17
4
1773
.84
0.30
2063
.7
0.39
1367
.19
0.16
8
1584
.7
0.12
2103
.7
0.05
6
55.7
D(+
Q)
0.6
980.
59
0.12
3
1099
.4
0.06
2
446.
8 0.
101
585.
6 0.
045
773.
4 0.
112
970.
3 0.
084
1046
.31
0.30
1178
.73
@
0.02
8
1242
.88
0.65
1453
.32
0.49
1670
.33
1.10
1895
.98
0.60
1967
.3
0.12
3
135
95Cs84
5CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02 (continued)
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
595.43≥8.2≤0.37
3/2,5/2,7/2+ 646.528.20.334380
710.298.70.11
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 891.587.61.1
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
3/2,5/2,7/2+ 1020.307.51.16
1037.278.20.23
1139.11
3/2,5/2,7/2+ 1215.028.10.22
1395.257.90.34
1411.7≥8.3≤0.11
1461.317.40.86
1508.247.90.24
1510.33
1599.997.70.38
1652.757.01.7
1831.47.60.32
3/2,5/2,7/2+ 2063.607.20.6
1/2,3/2,5/2 2185.586.52.1
3/2,5/2 2304.716.43.0
3/2,5/2,7/2+ 2423.5≥7.5≤0.20
3/2,5/2 2510.466.51.84
1/2,3/2,5/2 2586.066.70.98
2727.637.30.20
1/2,3/2,5/2 2852.317.20.18
3/2,5/2 2936.847.00.24
3/2,5/2 3130.337.00.16
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme (continued)
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
505.
07
0.36
626.
89
0.95
730.
4 0.
151
801.
62
0.59
305.
0 0.
039
326.
8 0.
090
818.
29
0.27
624.
3 0.
095
745.
16 @
0.
47
745.
16 @
0.
056
699.
6 0.
084
996.
4 0.
30
1214
.9
0.07
3
388.
6 0.
062
879.
74
0.15
7
1001
.7
0.06
2
1105
.6
0.10
1
1176
.3
0.07
8
896.
3 0.
15
441.
3 0.
095
454.
46
0.26
518.
8 0.
050
569.
64
0.15
946.
5 0.
06
1067
.56
@
0.01
7
1067
.56
@
0.14
6
1171
.5
0.14
6
565.
4 0.
09
775.
6 0.
084
1114
.8
0.13
4
1115
.0 &
0.
17
1289
.47
0.49
914.
91206
.45
@
0.19
0
1206
.45
@
0.35
1309
.4
0.09
710.
40
0.19
6
761.
04
0.19
6
1006
.0
0.26
1137
.52
0.36
1259
.26
0.55
1362
.91
0.31
1434
.13
0.25
1652
.8
0.11
135
95Cs84
6CI TAT I ON :N uclear Data Sheets (2001)
F rom N N DC(BN L )program E N SDAT
135
95Cs84
135
95Cs84
139Xe ββββ– Decay 1988Fa06,1980L e03,1972Ac02 (continued)
3/2– 0.0 39.68 s
%B– =100
135
94Xe85
Q–=505721
7/2+ 0.08.61u16
5/2+,7/2+ 218.6447.34.9
3/2+,5/2,7/2+ 289.767.61.9
5/2(+),7/2+ 393.486.713.8
3/2,5/2,7/2+ 393.797.61.6
3/2(+),5/2(+) 515.226.421.94450
595.43≥8.2≤0.37
3/2,5/2,7/2+ 646.528.20.334380
710.298.70.11
3/2+,5/2,7/2+ 732.387.42.2
3/2,5/2,7/2+ 891.587.61.1
3/2,5/2,7/2+ 942.547.51.18
1/2,3/2,5/2 1006.736.68.8
1139.11
3/2,5/2,7/2+ 1215.028.10.22
1395.257.90.34
1508.247.90.24
1599.997.70.38
1693.927.70.35
1793.2
3/2,5/2,7/2+ 2063.607.20.6
1/2,3/2,5/2 2185.586.52.1
3/2,5/2 2304.716.43.0
3/2,5/2,7/2+ 2423.5≥7.5≤0.20
3/2,5/2 2510.466.51.84
1/2,3/2,5/2 2586.066.70.98
2727.637.30.20
1/2,3/2,5/2 2852.317.20.18
3/2,5/2 2936.847.00.24
3/2,5/2 3130.337.00.16
1/2,3/2,5/2 3208.836.60.40
1/2,3/2,5/2 3372.736.90.14
3/2,5/2 3504.676.30.38
1/2,3/2,5/2 3745.56.00.40
1/2,3/2,5/2 3924.746.10.16
1/2– ,3/2– ,5/2– 4227.675.90.10
L og ftI β–E β–
Decay Scheme (continued)
I ntensi ties: I (γ+ce) per 100 parent decays
@ M ul tiply placed; intensi ty sui tably divided
& M ul tiply placed; undivided intensi ty given
218.
59 E
2+M
1 63
71.0
[M
1,E2]
1.
1
289.
78 (
E2)
9.
6
103.
75 (
M1+
E2)
0.
64
174.
97 @
D(+
Q)
12.8
393.
50 (
M1+
E2)
6.
9
174.
97 @
D(+
Q)
9.8
121.
37 @
0.
47
121.
37 @
0.
062
225.
38 [
M1,
E2]
3.
3
296.
53 (
M1,
E2)
22
.7
515.
44 [
M1,
E2]
0.
37
595.
43
0.28
356.
72 n
otM
1 0.
57
646.
50
0.62
491.
47 @
0.
34
338.
86 D
,E2
0.63
442.
7 [D
,E2]
0.
181
513.
88 [
D,E
2]
0.85
732.
42 D
,E2
1.91
181.
3 0.
140
498.
2 [D
,E2]
0.
045
601.
84
1.2
672.
39
0.14
6
891.
76
0.17
4
427.
7 [D
,E2]
0.
074
549.
02 @
0.
062
549.
02 @
0.
69
652.
5 0.
27
723.
84
1.80
942.
61
0.08
491.
47 @
1.
46
612.
82 @
4.
5
612.
82 @
1.
23
716.
96
0.16
2
788.
04
3.5
135
95Cs84
1
10
100
1000
10000
0 1000 2000 3000 4000 5000
Energy [keV]
5.0
6 M
eV
139Xe
Cou
nts
per
10
keV
Xe139
63 levels263 gamma transitionsaverage gamma energy increasedfrom 935 keV to 1370 keV (43%)
20
40
60
80
100
0 1000 2000 3000 4000 5000
Cum
ula
ive f
eedin
g (
%)
Energy [keV]
5.0
6 M
eV
139Xe
1
10
100
1000
10000
0 1000 2000 3000 4000 5000
Energy [keV]5.0
6 M
eV
139Xe
Ecu
t
Counts
per
10 k
eV
Anti-neutrino spectrum
A. Strumia, F. Vissani, PLB 564 (2003)
0
0.002
0.004
0.006
0.008
0.01
0 1000 2000 3000 4000 5000 6000
Energy [keV]
Number of 139Xe anti-neutrino interactions with protons(Antineutrino energy distribution
multiplied by inverse beta decay cross section)
0
0.05
0.1
0.15
0.2
0.25
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0 1000 2000 3000 4000 5000 6000
Neutr
ino p
robabili
ty in
% p
er
10 k
eV
Energy [keV]
σ (
ν̄ep
→ne
+)in 1
0−
41 c
m2
139Xe
Σ = 1.49 10−41 cm2
Σ = 1.87 10−41 cm2
20% difference
Deduced anti-neutrino spectrum
ENSDF
MTAS
Summary
Twenty-two decays of fission product, including seven of the first priority list established by the OECD NEA assessment in 2007 were measured with MTAS
Experimental spectrum shows excess of high-energy gamma-transitions not present in the ENSDF data base
MTAS measurements led to different beta decay patterns, resulting in a decrease of average energy of emitted beta and anti-neutrino particles and in an increase in average gamma energy (increase of “decay heat”)
Analysis changed the knowledge about average gamma energy per decay:
Xe139 935 keV 1370 keV 43%Br86 3259 keV 3712 keV 14%
Kr89 1801 keV 2647 keV 47%M. Karny First results from the Modular Total AbsorptionSpectrometer (MTAS) at the HRIBF (ORNL, Oak Ridge), ARIS 2014
Co60
1
10
100
1000
10000
100000
500 1000 1500 2000 2500
Counts
per
10 k
eV
Energy [keV]
1
10
100
1000
10000
100000
500 1000 1500 2000 2500
Co
un
ts p
er
10
ke
VEnergy [keV]
B. C. Rascoβ-γ and β-n-γ Emission in Mass A=137 Decay Chain Studied with the Modular Total Absorption Spectrometer (MTAS)
127XI and 23Na Neutron Capture Peak
137I