New decay data evaluation of
Nd-147
V. Chisté, M. M. Bé, C. Dulieu and X. Mougeot
LNE - Laboratoire National Henri Becquerel
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Evaluation – Adopted values.
Q data is from G. Audi, Nucl. Phys. A729(2003)129.
Atomic data are from E. Schönfeld, Nucl. Instrum. Meth.
Phys. Res. A369(1996)527.
T1/2 = 10.987 (11) d. The reduced - χ2 value is 1.4.
Reference
Experimental value (d)
W. Bothe (1946Bo25)
11.1 (2)
W. S. Emmerich (1951Em23)
11.1 (5)
E. Kondaiah (1951Ko01)
11.6 (3)
J. A. Marinsky (1951Ma**)
11.0 (3)
W. C. Rutledge (1952Ru10)
11.9 (3)
H. W. Wright (1957Wr37)
11.06 (4)
R. G. Wille (1960Wi10)
11.5 (5)
D. C. Hoffman (1963Ho15)
11.02 (5)
S. Baba (1971Ba28)
10.98 (1)
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Comments
Outlier
3
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Evaluation – Adopted values.
γ-ray emission intensity.
We have used:
- 9 measurements of relative γ-ray emission intensities, taking the 531-keV
transition as the reference line.
Also in the literature, 5 measurements of γ-ray emission intensities relative
to 91-keV γ-ray: NOT USED, data set uncertainties better than 2-4 %, that
is inconsistent with efficiency curve for γ-ray detectors.
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Evaluation – Adopted values.
Normalization factor.
Normalization =
100 − Pβ − ( g .s.)
∑ (1 + α )P
T
rel
αΤ – ICC calculated with BRICC computer code (http://bricc.anu.edu.au/)
Pβ(g.s.) = 0 (5) %, is in agreement with < 0.15 % (1966Be09, 1971Na11) and
< 0.25 % (1962Sh02).
Normalization = 0.127 (9)
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Main gamma-ray lines in Pm-147:
Eγ (keV)
Relative emission
intensity (%)
Absolute emission
intensity (%)
91.105 (2)
224 (14)
28.4 (18)
120.48 (5)
2.84 (11)
0.361 (14)
196.64 (4)
1.416 (14)
0.1798 (18)
275.374 (15)
6.10 (9)
0.775 (11)
319.411 (18)
15.68 (15)
1.991 (19)
398.155 (20)
6.73 (6)
0.855 (8)
410.48 (3)
1.077 (47)
0.137 (6)
439.895 (22)
9.47 (9)
1.203 (11)
489.24 (3)
1.07 (9)
0.136 (11)
531.016 (22)
100
12.7 (9)
594.80 (3)
2.089 (28)
0.2653 (36)
685.90 (4)
6.57 (7)
0.834 (9)
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Our evaluation:
Q(Audi)
(keV)
Qeff
(keV)
Rel. Error
(%)
895.7 (9)
890 (60)
0.284
Eγ (keV)
531.016 (22)
Adopted Value
This evaluation
N. Nica (2009Ni02)
12.7 (9)
13.37 (1)
Sainath et al. (1997Sa53): most recent data set
(relative values to the 531-keV γ-ray)
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Conclusion:
To solve the problems in the Nd-147 decay:
- Pβ to the ground state;
- discrepancies for γ-ray emission intensities
- etc;
We need new measurements of these nuclear data.
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More information about this evaluation can be obtained at:
http://www.nucleide.org/DDEP_WG/DDEPdata.htm
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Table 6: Experimental data sets of the relative γ-ray emission intensities (%).
Reference
1966Ar16
Energy (keV)
1967Ca18
1967Do07
1967Hi04
1967Ja05
1974Ra30
1979Vo09
1997Sa53
275 (50)µ
211 (42)
248 (13)
227 (35) 300 (100)µ 220 (14)
91.105 (2)
2.6 (4)
2.5 (5)
2.1 (2)
3.3 (5)
8 (1)µ
3.3 (5)
120.48 (5)
µ
1.3 (2)
1.30 (13)
1.0 (1)
1.5 (6)
2 (1)µ
1.4 (4)
196.64 (4)
6.6 (7)
6.5 (6)
6.1 (5)
6.8 (14)
7 (2)
6.7 (7)
275.374 (15)
14.2 (14)
15.8 (10) 16.3 (24)
15 (5)
16.5 (10)
319.411 (18) 15.0 (15)
7.0 (7)
6.4 (6)
6.7 (5)
6.8 (11)
5 (2)µ
6.5 (7)
398.155 (20)
1.3 (1)
1.30 (13)
0.9 (2)
1.2 (5)
1.0 (6)
1.2 (3)
410.48 (3)
8.8 (9)
9.2 (9)
9.7 (6)
9.3 (11)
8 (2)µ
9.8 (2)
439.895 (22)
0.70 (8)
1.5 (8)
1.2 (3)
1.1 (5)
1.0 (5)
1.4 (4)
489.24 (3)
100
100
100
100
100
100
531.016 (22)
2.2 (2)
2.20 (22)
1.6 (2)µ
1.9 (4)
2 (1)
2.0 (3)
594.80 (3)
7.0 (7)
6.6 (7)
5.0 (4)µ
5.9 (10)
6 (1)
6.7 (6)
685.90 (4)
µ
: the experimental value has been shown to be an outlier value by the Lweight program.
239 (5)
3.05 (10)
1.38 (6)
6.05 (10)
15.0 (3)
6.59 (10)
0.93 (5)
9.19 (14)
1.12 (6)
100
1.92 (6)
6.1 (2)
210.0 (43)
2.810 (46)
1.420 (15)
6.81 (8)
15.91 (17)
6.82 (8)
1.120 (13)
9.54 (10)
1.160 (14)
100
2.120 (26)
6.63 (7)
1998Po**
6 (1)
15 (2)
100
2.0 (3)
Evaluated
Reduced χ2
224 (14)
2.84 (11)
1.416 (14)
6.10 (9)
15.68 (15)
6.73 (6)
1.077 (47)
9.47 (9)
1.07 (9)
100
2.089 (28)
6.57 (7)
4.6
3.5
0.3
0.4
1.2
0.6
2.7
1.3
3.9
1.5
1.2