New Neutron-Deficient Isotopes of Tantalum

Faler, K.T.; Rasmussen, J. O.

doi:10.1103/physrev.118.265

Cited by 21 publications

(4 citation statements)

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“…The 511-kev annihilation radiation peak decayed with a half-life of 1.3h0.1 hr, in agreement with that found by Faler and Rasmussen (20 …”

Section: (V) Ta174supporting

confidence: 80%

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Nuclear Reactions Induced in Tantalum by Protons of Energy Up to 84 Mev

Rao¹,

Yaffe²

1963

Can. J. Chem.

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Kuclear reactions induced in tantalum by protons of energy up to 84 Mev have been studied and excitation functions obtained for products formed by (p,xn), (p,pxn), (p12pxn), and (p,3pxn) reactions. Radiation characteristics of the products were redetermined. Previously unreported ?-rays with energies 90 to 1050 kev have been found for \VI76, and 113 kev for WIi7. A new half-life of 2.7f 0.1 hr for WI76 is reported. The cross sections for the (p,xn) reactions were compared with the values predicted by Jackson's schematic model and found to be in reasonable agreement. More complex reactions are discussed in the light of current nuclear theories.

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“…The 511-kev annihilation radiation peak decayed with a half-life of 1.3h0.1 hr, in agreement with that found by Faler and Rasmussen (20 …”

Section: (V) Ta174supporting

confidence: 80%

“…The half-life for Ta173 was found to be 3.7 hr, in agreement with that reported by Faler and Rasmussen (20). Ta173 was observed by the growth of an intense photopeak due to Hf173 (24 hr) in the separated tantalum fraction.…”

Section: (Iv) Ta173supporting

confidence: 80%

Nuclear Reactions Induced in Tantalum by Protons of Energy Up to 84 Mev

Rao¹,

Yaffe²

1963

Can. J. Chem.

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“…Faler and Rasmussen described the observation of 173 Ta, 174 Ta, and 175 Ta in "New neutron-deficient isotopes of tantalum" in 1960 [32]. 14 minutes.…”

Section: −175 Tamentioning

confidence: 99%

“…173−175 Ta Faler and Rasmussen described the observation of 173 Ta, 174 Ta, and 175 Ta in "New neutron-deficient isotopes of tantalum" in 1960 [32]. 14 N beams between 35 and 95 MeV from the Berkeley heavy-ion linear accelerator bombarded Ho 2 O 3 powder targets and (xn) fusion evaporation reactions produced tungsten which subsequently decayed to tantalum isotopes.…”

Section: Tamentioning

confidence: 99%

Discovery of tantalum, rhenium, osmium, and iridium isotopes

Robinson

Thoennessen

2012

Atomic Data and Nuclear Data Tables

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Currently, thirty-eight tantalum, thirty-eight rhenium, thirty-nine osmium, and thirty-eight iridium, 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.The discovery of tantalum, rhenium, osmium, and iridium isotopes is discussed as part of the series 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.Good examples why publications in conference proceedings should not be considered are 118 Tc and 120 Ru which had been reported as being discovered in a conference proceeding [4] but not in the subsequent refereed publication [5]. The initial literature search was performed using the databases ENSDF [3] and NSR [6] 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 [7-12]. A good reference for the discovery of the stable isotopes was the second edition of Aston's book "Mass Spectra and Isotopes" [13].

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