Journal Article

FZJ-2020-04289

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Resolution of a discrepancy in the γ -ray emission probability from the β decay of Ce g 137

Basunia, M. S. ; Morrell, J. T. ; Uddin, M. S. ; Voyles, A. S. ; Nesaraja, C. D. ; Bernstein, L. A. ; Browne, E. ; Martin, M. J. ; Qaim, S. M. (Corresponding author)FZJ*

2020
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/26063  doi:10.1103/PhysRevC.101.064619

Abstract: We have deduced the emission probability of the 447-keV γ ray from the ɛ+β+ decay of 137Ceg (9.0 h) relative to that of the 254-keV γ ray from the 137Cem (34.4 h) decay in transient equilibrium. The time-dependent factor in transient equilibrium was applied following the Bateman equation for a radioactive decay chain. The isotope was produced via the 139La(p,3n)137Cem,g reaction by bombarding natLa with a proton beam from the 88-in. cyclotron at Lawrence Berkeley National Laboratory. γ-ray intensities were measured using an HPGe detector. The emission probability for the 447-keV γ ray deduced in this work is 1.21(3) (that is 1.21 ± 0.03) per hundred parent decays, which differs significantly from an earlier published value of 2.24(10). We identify the source of this discrepancy to be an incorrect use of the time-dependent factor. Additionally, we have deduced the emission probability of the 504-keV γ ray from the decay of 85Yg (2.68 h) relative to that of the 232-keV γ ray from the 85Srm (1.127 h) decay in transient equilibrium. The isotope was produced via the 86Sr(p,2n)85Yg reaction by bombarding 86SrCO3 with a proton beam at the same facility. The study confirms the assumption of the time-dependent correction for recommending the emission probability of the 504-keV γ ray in the literature. Our work highlights the importance of explicit description by authors of any time-dependent correction they have made when reporting γ-ray intensities for nuclides in transient equilibrium. The need and significance of accurate and precise decay data of 137Ceg and 85Yg in basic science and medicine is briefly outlined.

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Contributing Institute(s):

1. Nuklearchemie (INM-5)

Research Program(s):

1. 573 - Neuroimaging (POF3-573) (POF3-573)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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