Neutron-Deficient Activities of Praseodymium

Handley, T.H.; Olson, Elmer L.

doi:10.1103/physrev.96.1003

Cited by 25 publications

(8 citation statements)

References 3 publications

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“…"A=122: Two experiments were performed at this mass value: one with a dual proton telescope where a total of about 1800 protons were recorded and one with the tape system where xand γ-rays were measured in coincidence with protons. The x-ray spectrum in the second experiment showed only Ba K α -and K β -lines which leads us to the conclusion that the new beta-delayed proton precursor is 122 La." The observed half-life of 8.7 (7) s is in agreement with the currently accepted half-life of 8.6(5) s.…”

Section: Discovery Of 117−153 Lasupporting

confidence: 80%

“…Thus separated, this isotope repeatedly showed an easily measurable half-life of 1.5 hours." The quoted half-life of 1.5(1) h is in agreement with the currently accepted value of 1.28(3) h. Previously determined limits of <4 min or >1 y[122] were evidently incorrect. The same group simultaneously submitted another paper with a different first author confirming the results[124].…”

supporting

confidence: 80%

“…The observed half-life of 13.5 min for 136 Pr is agrees with the currently accepted value of 13.1(1) min. Previously reported half-lives of 70 min [122] and 1.00 (15) h [124] was evidently incorrect. 139 Pr agree with the presently adopted values of 2.12(4) h and 4.41(4) h, respectively.…”

Section: Prmentioning

confidence: 85%

“…The proton dripline has already been crossed with the observation of the proton emitter 121 Pr. However, 122 Pr and 123 Pr have not been observed. In addition, it is anticipated that six more isotopes 115−120 Pr could still have half-lives longer than 10 −9 ns [17].…”

Section: Discovery Of 121−154 Prmentioning

confidence: 90%

“…The discovery of 118 Cs, 119 Cs, 120 Cs, 121 Cs, and 122 Cs was reported in "Identification of new neutron-deficient nuclides 76 Rb and 118 Cs. Half-lives of 78 Rb, 119−124 Cs, 126 Cs" by Chaumont et al in 1969 [28].…”

Section: Csmentioning

confidence: 99%

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Discovery of cesium, lanthanum, praseodymium and promethium isotopes

May

Thoennessen

2012

Atomic Data and Nuclear Data Tables

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Currently, forty-one cesium, thirty-five lanthanum, thirty-two praseodymium, and thirty-one promethium, isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.summarizing the discovery of isotopes, beginning with the cerium isotopes in 2009 [1]. Guidelines for assigning credit for discovery are (1) clear identification, either through decay-curves and relationships to other known isotopes, particle or γ-ray spectra, or unique mass and Z-identification, and (2) publication of the discovery in a refereed journal. The authors and year of the first publication, the laboratory where the isotopes were produced as well as the production and identification methods are discussed. When appropriate, references to conference proceedings, internal reports, and theses are included. When a discovery includes a half-life measurement the measured value is compared to the currently adopted value taken from the NUBASE evaluation [2] which is based on the ENSDF database [3]. In cases where the reported half-life differed significantly from the adopted half-life (up to approximately a factor of two), we searched the subsequent literature for indications that the measurement was erroneous. If that was not the case we credited the authors with the discovery in spite of the inaccurate half-life. All reported half-lives inconsistent with the presently adopted half-life for the ground state were compared to isomers half-lives and accepted as discoveries if appropriate following the criterium described above. If the first observation of an isotope corresponded to an isomeric state, the first observation of the ground state is also included.The first criterium excludes measurements of half-lives of a given element without mass identification. This affects mostly isotopes first observed in fission where decay curves of chemically separated elements were measured without the capability to determine their mass. Also the four-parameter measurements (see, for example, Ref.[4]) were, in general, not considered because the mass identification was only ±1 mass unit.The second criterium affects especially the isotopes studied within the Manhattan Project. Although an overview of the results was published in 1946 [5], most of the papers were only published in the Plutonium Project Records of the Manhattan Project Technical Series, Vol. 9A, "Radiochemistry and the Fission Products," in three books by Wiley in 1951 [6]. We considered this first unclassified publication to be equivalent to a refereed paper. 2The initial literature search was performed using the databases ENSDF [3] and NSR [7] of the National Nuclear Data Center at Brookhaven National Laboratory. These databases are complete and reliable back to the early 1960's. For earlier references, several editions of the Table of Isotopes were used [8][9][10][11][12][13]. A good reference for the discovery of the stable isotopes was the se...

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Section: Discovery Of 117−153 Lasupporting

confidence: 80%

supporting

confidence: 80%