Neutron-deficient isotopes of yttrium and zirconium

doi:10.1016/0022-1902(63)80002-0

Journal of Inorganic and Nuclear Chemistry

Volume 25, Issue 2, March 1963, Pages 151-157

https://doi.org/10.1016/0022-1902(63)80002-0 Get rights and content

Abstract

Two new activities have been found in the neutron-deficient isotopes of yttrium produced by (p, pxn) reactions on yttrium. The half-lives have been determined as 34·7 ± 1·6 min. and 12·3 ± 0·2 min. The activities are assigned to ⁸³Y and ⁸²Y respectively on the basis of their genetic relationships with strontium isotopes. The half-lives of ⁸⁵Y and ⁸⁴Y have been re-determined as 3·4 hr and 2·6 ± 0·5 hr respectively.

A new activity with a half-life of 6 min has been assigned to ⁸⁵Zr, and two new γ-rays have been found to be associated with the decay of ⁸⁷Zr and ⁸³Sr.

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Cited by (17)

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The evaluated experimental data are presented for 14 known nuclides of mass 87 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru). New datasets have been added for ⁸⁷Ga, ⁸⁷Se, ⁸⁷Kr, ⁸⁷Rb, ⁸⁷Sr, ⁸⁷Nb, and ⁸⁷Tc. The observation of and new lifetime measurements for ⁸⁷As at the NSCL Coupled Cyclotron Facility and the Oak Ridge Isochronous Cyclotron at the HRIBF–ORNL Facility are included in the adopted levels for this isotope. The new evaluation also includes an isomeric level at unknown energy for ⁸⁷Tc, changes to the adopted levels for ⁸⁷Nb based on newly published data including an extension of the high spin levels and new lifetime measurements, and new heavy ion data for ⁸⁷Kr. New high spin levels for ⁸⁷Rb were observed, indicating possible neutron core excitations. In addition, the ground state lifetime of ⁸⁷Rb has been revised and a new lifetime measurement for an excited level in ⁸⁷Rb indicates a possible proton spin flip. New excitation levels have been observed for the first time in ⁸⁷Se. New direct and precise measurement of atomic masses of ⁸⁷Tc, ⁸⁷Mo, ⁸⁷Nb, ⁸⁷Zr, ⁸⁷Mo and ⁸⁷Tc have greatly improved the Q value landscape in this mass region. This work supersedes the previous A=87 evaluation published in 2002He09, and Q values for all isotopes were updated to incorporate the mass evaluation in 2012Wa38.
Nuclear data sheets for A = 85
2014, Nuclear Data Sheets
Evaluated experimental data are presented for 13 known nuclides of mass 85 (Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo). Since the previous 1990 evaluation of $A = 85$ , ⁸⁵Zn, ⁸⁵Ga, ⁸⁵Ge and ⁸⁵nuclides are newly added here. Excited state data for ⁸⁵Se, ⁸⁵Zr have become available from radioactive decay and in–beam γ–ray studies. New and improved high–spin data are available for ⁸⁵Br, ⁸⁵Kr, ⁸⁵Rb, ⁸⁵Y, ⁸⁵Nb and ⁸⁵Mo. New direct and precise measurement of atomic masses of ⁸⁵Ge, ⁸⁵As, ⁸⁵Se, ⁸⁵Br, ⁸⁵Rb, ⁸⁵Zr, ⁸⁵Nb and ⁸⁵Mo have greatly improved the landscape of β decay–Q values and separation energies in this mass region.
In spite of extensive experimental work on the isobaric nuclei of this mass chain several deficiencies remain. No excited states are known in ⁸⁵Zn, ⁸⁵Ga, ⁸⁵As. Only a few excited state are assigned in ⁸⁵Ge from ⁸⁵Ga β– decay. From radioactivity studies, the decay schemes of ⁸⁵Zn and ⁸⁵Mo are not known, and those for ⁸⁵Ga, ⁸⁵Ge, ⁸⁵As and 10.9–s isomer of ⁸⁵Zr are incomplete. Level lifetimes are not known for excited states in ⁸⁵Se, ⁸⁵Br, ⁸⁵Nb and ⁸⁵Mo. The ⁸⁵Tc nuclide has not been detected in fragmentation experiments at GANIL, alluding to its unbound nature for proton emission. The ⁸⁵Kr, ⁸⁵Rb, ⁸⁵Sr, and ⁸⁵Y nuclides remain the most extensively studied from many different reactions and decays.
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Citation Excerpt :
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Neutron-deficient isotopes of yttrium and zirconium

Abstract

J. Amer. Chem. Soc.

Solvent extraction in analytical chemistry