New Isotope<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>150</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Ward, T.E.; Marcos, Nuria; Kuroda, P. Κ.

doi:10.1103/physrevc.2.2410

Cited by 8 publications

(9 citation statements)

References 6 publications

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“…Isotopes were identified with a Nier-type mass spectrometer and half-lives were determined by β counting. The measured half-life for 144 La was listed in the main table with 41(2) s which is consistent with the currently adopted value of 40.8(4) s. 145…”

Section: Lasupporting

confidence: 88%

“…145 La was identified in 1974 by Aronsson et al in the paper "Short-lived isotopes of lanthanum, cerium and praseodymium studied by SISAK-technique" [95]. A uranium target was irradiated with 14 MeV neutrons and after chemical separation 145 La was identified by measuring γ-ray spectra with a Ge(Li)-detector system. "So far, no conclusive data have been presented for the isotopes 145 La and 146 La.…”

Section: Lamentioning

confidence: 99%

“…A uranium target was irradiated with 14 MeV neutrons and after chemical separation 145 La was identified by measuring γ-ray spectra with a Ge(Li)-detector system. "So far, no conclusive data have been presented for the isotopes 145 La and 146 La. However, information available from other laboratories along with our own data suggests that the γ-groups with half-lives 20 ± 5 sec and 11 ± 1 sec should be associated with the decay of 145 La and 146 La, respectively" The quoted half-life of 145 La is consistent with the currently adopted value of 24.8 (20) s. The information from other laboratories mentioned in the quote refers to a conference proceeding, an unpublished report and a private communication.…”

Section: Lamentioning

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: Lasupporting

confidence: 88%

Section: Lamentioning

confidence: 99%

Section: Lamentioning

confidence: 99%

See 1 more Smart Citation

Discovery of cesium, lanthanum, praseodymium and promethium isotopes

May

Thoennessen

2012

Atomic Data and Nuclear Data Tables

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“…They proposed a partial decay scheme and determined the ö^-value as 3.0 ± 0.2 MeV. The nuclide II^PR was first identified by WARD et al [7] after bombardment of enriched i®®Nd with 14 MeV neutrons. They determined the half-life as 6.1 s. In a study of the decay of ^^''Ce, AEONSSON et al [8] have also found a half-life of 6.2 s for the daughter product isopj.…”

Section: Introductionmentioning

confidence: 99%

Decay Properties of Some Neutron-Rich Praseodymium Isotopes

Skarnemark¹

1976

Radiochimica Acta

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Neutron-rich Pr isotopes produced in the thermal neutroninduced fission of have been investigated by means of y-y coinoidence experiments. The nuclides have been separated from the fission product mixture, using the fast chemical Separation system SISAK in connection with a gas jet recoil transport system. The results include assignments of several new y-ray energies and partial decay schemes for "'Pr, "»Pr and i^oPr.

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“…The differences to [10] in the resulting logft-values are due to different Qp-values. We have used the value Normalized to the 130 keV 7-ray Seen in the #-gated single spectrum but not placed in the decay scheme of 5.1 MeV from Wapstra and Audi [19], while Fogelberg and Skarnemark [10] used the value of 5.7_+0.3 MeV of Ward et al [8]. The spin and parity values were deduced from level systematics [10,24,26].…”

Section: The Decay Of Ts~mentioning

confidence: 99%

Beta-decay of148,150,152Pr into levels of148,150,152Nd

Karlewski

Hildebrand

Brügger

et al. 1988

Z. Physik A - Atomic Nuclei

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The/?--decay of 14 s, 15 o, 1 s 2pr into levels of 148,1 s o, 1 s 2Nd has been studied by y-singles, y y-coincidence and for 148pr also by y y-angular correlation measurements. The praseodymium activities have been obtained by thermal neutron-induced fission of z35U followed by on-line mass separation with the helium-jet coupled mass separator HELIOS. Decay schemes for these heaviest praseodymium nuclides are proposed. From the angular correlation measurements spin values for the seven lowest levels of 148Nd are deduced, Spin and parity assignments for the lower levels in 15~ have been extrapolated from level systematics.

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New IsotopePr150

Cited by 8 publications

References 6 publications

Discovery of cesium, lanthanum, praseodymium and promethium isotopes

Discovery of cesium, lanthanum, praseodymium and promethium isotopes

Decay Properties of Some Neutron-Rich Praseodymium Isotopes

Beta-decay of148,150,152Pr into levels of148,150,152Nd

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