skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: New element californium (atomic number 98)

Abstract

Definite identification has been made of an isotope of the element with atomic number 98 through the irradiation of Cm(242) with about 35-MeV helium ions in the Berkeley Crocker Laboratory 60-inch cyclotron. The isotope which has been identified has an observed half-life of about 45 minutes and is thought to have the mass number 244. The observed mode of decay of 98(244) is through the emission of alpha-particles, with energy of about 7.1 MeV, which agrees with predictions. Other considerations involving the systematics of radioactivity in this region indicate that it should also be unstable toward decay by electron capture. The chemical separation and identification of the new element was accomplished through the use of ion exchange adsorption methods employing the resin Dowex-50. The element 98 isotope appears in the eka-dysprosium position on elution curves containing berkelium and curium as reference points--that is, it preceeds berkelium and curium off the column in like manner that dysprosium preceeds terbium and gadolinium. The experiments so far have revealed only the tripositive oxidation state of eka-dysprosium character and suggest either that higher oxidation states are not stable in aqueous solutions or that the rates of oxidation are slow. The successful identification of somore » small an amount of an isotope of element 98 was possible only through having made accurate predictions of the chemical and radioactive properties.« less

Authors:
Publication Date:
Research Org.:
USAEC Technical Information Service Extension, Oak Ridge, TN (United States)
OSTI Identifier:
381639
Report Number(s):
AD-A-311004/6/XAB; AECD-2885
TRN: 62750724
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jun 1950
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; CALIFORNIUM 244; ALPHA DECAY; PARTICLE IDENTIFICATION; OXIDATION; HALF-LIFE; SEPARATION PROCESSES

Citation Formats

Thompson, S G. New element californium (atomic number 98). United States: N. p., 1950. Web.
Thompson, S G. New element californium (atomic number 98). United States.
Thompson, S G. Thu . "New element californium (atomic number 98)". United States.
@article{osti_381639,
title = {New element californium (atomic number 98)},
author = {Thompson, S G},
abstractNote = {Definite identification has been made of an isotope of the element with atomic number 98 through the irradiation of Cm(242) with about 35-MeV helium ions in the Berkeley Crocker Laboratory 60-inch cyclotron. The isotope which has been identified has an observed half-life of about 45 minutes and is thought to have the mass number 244. The observed mode of decay of 98(244) is through the emission of alpha-particles, with energy of about 7.1 MeV, which agrees with predictions. Other considerations involving the systematics of radioactivity in this region indicate that it should also be unstable toward decay by electron capture. The chemical separation and identification of the new element was accomplished through the use of ion exchange adsorption methods employing the resin Dowex-50. The element 98 isotope appears in the eka-dysprosium position on elution curves containing berkelium and curium as reference points--that is, it preceeds berkelium and curium off the column in like manner that dysprosium preceeds terbium and gadolinium. The experiments so far have revealed only the tripositive oxidation state of eka-dysprosium character and suggest either that higher oxidation states are not stable in aqueous solutions or that the rates of oxidation are slow. The successful identification of so small an amount of an isotope of element 98 was possible only through having made accurate predictions of the chemical and radioactive properties.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1950},
month = {6}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: