Energy levels in 137Xe populated in the decay of the delayed neutron precursor 137I

Fogelberg, B.; Tovedal, H.

doi:10.1016/0375-9474(80)90410-8

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…However, since the level-density correction factors for 137 Xe in RIPL-3 (C = 2.96189 and P = 1.09479) did not reproduce the available experimental information, we have calculated new corrections (C = −1.02 and P = 0.69). In particular, the experimental number of resonances in 137 Xe in the region 4.03-4.53 MeV, just above S n , according to the experimental work of B. Fogelberg et al [58] is 4 1/2 + levels, (24 ± 8) 1/2 − levels, and (16 ± 5) 3/2 − levels. With the original correction factors from RIPL-3 one obtains unrealistically large values: 618 1/2 + levels, 12630 1/2 − levels, and 24722 3/2 − levels.…”

Section: Tags Analysesmentioning

confidence: 91%

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
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Section: Tags Analysesmentioning

confidence: 91%

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
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“…As described above, the MTAS setup detects all three of these components of the β feeding. It is not clear how the ground state βfeeding nor the uncertainty of the previous measurement of 45.2(7)% was made [1,19].…”

Section: B 137 I Complete β-Feeding Intensitymentioning

confidence: 94%

Complete β -decay pattern for the high-priority decay-heat isotopes I137 and Xe
Rasco
¹
,
Rykaczewski
²
,
Fijałkowska
³

et al. 2017
Phys. Rev. C
31
2
16
1
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Background An assessment done under the auspices of the Nuclear Energy Agency in 2007 suggested that the β decays of abundant fission products in nuclear reactors may be incomplete. Many of the nuclei are potentially affected by the so called Pandemonium effect and their β-γ decay heat should be restudied using the total absorption technique. The fission products 137 I and 137 Xe were assigned highest priority for restudy due to their large cumulative fission branching fractions. In addition, measuring β-delayed neutron emission probabilities is challenging and any new technique for measuring the β-neutron spectrum and the β-delayed neutron emission probabilities is an important addition to nuclear physics experimental techniques.Purpose To obtain the complete β-decay pattern of 137 I and 137 Xe and determine their consequences for reactor decay heat andνe emission. Complete β-decay feeding includes ground state to ground state β feeding with no associated γ rays, ground state to excited states β transitions followed by γ transitions to the daughter nucleus ground state, and β-delayed neutron emission from the daughter nucleus in the case of 137 I. MethodWe measured the complete β-decay intensities of 137 I and 137 Xe with the Modular Total Absorption Spectrometer at Oak Ridge National Laboratory. We describe a novel technique for measuring the β-delayed neutron energy spectrum, which also provides a measurement of the β-neutron branching ratio, Pn.Results We validate the current ENSDF evaluation of 137 Xe β decay. We find that major changes to the current ENSDF assessment of 137 I β-decay intensity are required. The average γ energy per β decay for 137 I β decay (γ decay heat) increases by 19%, from 1050 keV to 1250 keV, which increases the average γ energy per 235 U fission by 0.11%. We measure a β delayed neutron branching fraction for 137 I β decay of 7.9 ± 0.2(f it) ± 0.4(sys)% and we provide a β-neutron energy spectrum. ConclusionsThe Modular Total Absorption Spectrometer measurements of 137 I and 137 Xe demonstrate the importance of revisiting and remeasuring complex β decaying fission products with total absorption spectroscopy. We demonstrate the ability of the Modular Total Absorption Spectrometer to measure β-delayed neutron energy spectra.

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“…The largest source of uncertainty in Method (1) is from Ω 137 , which is sensi- tive to the details of the β decay and the electric field in the trap. The largest uncertainty in Method (2) is the 10% uncertainty in the γ-ray intensity [41], while P n measured in Method (3) is limited by the ≈ 6% statistical uncertainty in n β136 .…”

Section: For Decays Of Trappedmentioning

confidence: 99%

“…The trap was left empty for a period of 5, 25, or 40 s at the end of each cycle to assess backgrounds. Trap contents were also monitored by detecting a single peak from the 1218-keV (I γ = 12.8 ± 1.3%) and 1220-keV (I γ = 3.5 ± 0.4%) γ rays emitted following 137 I β decay [41] and the 455-keV (I γ = 31 ± 3%) γ ray emitted following 137 Xe β decay [34] in coincidence with β particles. The ratio of 137 I to 137 Xe was consistent with the independent yields (IY) from 252 Cf fission [42].…”

mentioning

confidence: 99%

β-Delayed Neutron Spectroscopy Using Trapped Radioactive Ions

et al. 2013

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Energy levels in 137Xe populated in the decay of the delayed neutron precursor 137I

Cited by 16 publications

References 18 publications

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
View full text Add to dashboard Cite

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
View full text Add to dashboard Cite

Complete β -decay pattern for the high-priority decay-heat isotopes I137 and Xe
Rasco
¹
,
Rykaczewski
²
,
Fijałkowska
³

et al. 2017
Phys. Rev. C
31
2
16
1
View full text Add to dashboard Cite

β-Delayed Neutron Spectroscopy Using Trapped Radioactive Ions

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Energy levels in 137Xe populated in the decay of the delayed neutron precursor 137I

Cited by 16 publications

References 18 publications

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and Guadilla1, Taín2, Algora3 et al. 2019Phys. Rev. C144110View full textAdd to dashboardCite

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and Guadilla1, Taín2, Algora3 et al. 2019Phys. Rev. C144110View full textAdd to dashboardCite

Complete β -decay pattern for the high-priority decay-heat isotopes I137 and XeRasco1, Rykaczewski2, Fijałkowska3 et al. 2017Phys. Rev. C312161View full textAdd to dashboardCite

β-Delayed Neutron Spectroscopy Using Trapped Radioactive Ions

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Product

Resources

About

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
View full text Add to dashboard Cite

Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and
Guadilla¹,
Taín²,
Algora³
et al. 2019
Phys. Rev. C
14
4
11
0
View full text Add to dashboard Cite

Complete β -decay pattern for the high-priority decay-heat isotopes I137 and Xe
Rasco
¹
,
Rykaczewski
²
,
Fijałkowska
³

et al. 2017
Phys. Rev. C
31
2
16
1
View full text Add to dashboard Cite