Artificial Radioactivity of Dysprosium and other Rare Earth Elements

Hevesy, G.; Levi, Hilde

doi:10.1038/136103a0

Cited by 43 publications

(21 citation statements)

References 2 publications

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“…Further, in the case of some gamma transitions, matrix elements calculated on the basis of such a single-particle approximation agree with experimental data within an order of magnitude. 2 Another immediate result of the single-particle approximation which concerns itself with excited states of odd-even nuclei seems to hold in many cases; namely, the similarity of decay schemes of nuclei which differ by two neutrons or two protons. The smooth "movements" of corresponding levels when one goes in such "families" from one nucleus to the other 3 strengthens one's confidence in the interpretation of the similarities.…”

Section: Introductionmentioning

confidence: 99%

Mixed Configurations in Nuclei

1953

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The role of mixed configurations in nuclear states is discussed and illustrated by various examples; it is discussed in particular for /3 transitions with anomalous ft values and as a qualitative explanation of the empirically-found smooth variations of the first excited states of even-even nuclei. It is shown by various examples that a nucleon of one kind (neutron or proton) with a given j has a "stabilizing" influence on pairs of the other kind with a given/. This stabilization effect is calculated on simplified assumptions for different j and j'.

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Section: Introductionmentioning

confidence: 99%

Mixed Configurations in Nuclei

1953

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“…The 2.6-hour activity was first reported by Hevesy and Levi 11 and was confirmed by Pool and Quill 12 and by Inghram, Shaw, Hess, and Hayden. 13 The 1.25-minute ^-converted gamma-activity was initially reported by Flammersfeld.…”

Section: Dysprosiummentioning

confidence: 55%

The Internal Conversion Electrons of Several Short-Lived Neutron Induced Radioactivities

Caldwell

1950

Phys. Rev.

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Accurate values of the transition energy were measured for seven neutron-induced radioactivities using a permanent magnet beta-ray spectrograph. A special vacuum gate permitted the introduction of shortlived samples within twelve seconds after the end of bombardment without disturbing the vacuum in the spectrograph. Transition energies, accurate to about one percent, were determined as follows: cesium (3 hr.) 128.0 kev, cobalt (10.7 min.) 58.9 kev, columbium (6.6 min.) 41.5 kev, dysprosium (1.3 min.) 109.0 kev, dysprosium (2.6 hr.) 87.8 kev, iridium (1.5 min.) 57.4 kev, thulium (120 day) 84.8 kev. For the" five isomeric transitions, approximate values of the relative intensities of the electron lines were determined, and an assignment was made of the multipole order of the radiation, assuming electric multipole radiation.

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“…Together with Hilde Levi, he observed the extremely high activation yield of dysprosium and europium, which brought him to the idea of taking advantage of this fact by a new analytical method, the neutron activation analysis [23,24]. He wrote about this discovery in 1964: "Auer von Welsbach presented me on each of my visits with minute amounts of all the rare earth elements.…”

Section: The Discovery Of Neutron Activation Analysis Seventy Years Agomentioning

confidence: 94%