Mass excesses of 79As, 81As, and 80Ge

doi:10.1016/0375-9474(83)90513-4

Nuclear Physics A

Volume 411, Issue 1, 12 December 1983, Pages 151-160

https://doi.org/10.1016/0375-9474(83)90513-4 Get rights and content

Abstract

Accurate mass measurements for the nuclides ⁷⁹As, ⁸¹As, and ⁸⁰Ge have been measured. Good agreement has been found for ⁷⁹As and ⁸¹As with the Garvey-Kelson transverse mass relation and with several mass model predictions. The agreement for ⁸⁰Ge is not as satisfactory and presents a challenge for understanding mass values far off the line of stability.

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Cited by (5)

Nuclear Data Sheets for A = 79
2016, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 79 (Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb, Sr,Y,Zr) has been evaluated and presented together with adopted energies, Jπ, and decay modes of levels in these nuclei. No data are yet available for excited states in ⁷⁹Ni, ⁷⁹Cu and ⁷⁹Zr. The half–life of ⁷⁹Se, a nuclide of importance in reactor–irradiated fuel composition has been measured by several independent groups and reported in a number of publications after 1995, and seems to be converging to a narrow margin of experimental values. These measurements were likely prompted by a recommendation made in the 1993 update of A = 79 nuclides (1993Si28), that since a 1949PaZZ report, there had been no measurement until 1993, and that based on simulation studies by 1993HeZW, the value listed in 1949PaZZ, and cited in all data tables and charts for 44 years, was quite likely in error, being too low by a factor of 10. According to conclusions in recent papers such as 2014Do20, there is still room for improvement in the measurement of this half–life, and further experiments are expected. This evaluation supersedes earlier Nuclear Data Sheets for A = 79 (2002Si13,1993Si28, 1982Si21,1975Ur03).
Nuclear data sheets for A = 80
2005, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 80 (Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb,Sr,Y,Zr) with Z = 29 to 40 and N = 51 to 40 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for ⁸⁰Cu and ⁸⁰Zn. In ⁸⁰Sr, four superdeformed bands have been reported. The half-life of fully-ionized ⁸⁰Y isomer at 228.5 keV has been measured as 6.8 s 5, as compared to 4.8 s 3 for the neutral atom. This evaluation supersedes previous full evaluations of A = 80 published by 1982Si20 and 1975Gr19, a midstream evaluation of A = 80 published in ‘up-date mode’ by 1992Si19, and an update of ⁸⁰Y nuclide for ENSDF by J.K. Tuli in August 2003.
Nuclear data sheets for A = 79
2002, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 79 (Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb,Sr, Y,Zr) has been evaluated and presented together with adopted energies, Jp, and decay modes of levels in these nuclei. No data are yet available for excited states in 79 Cu, 79 Zn and 79 Zr. In the previous A=79 NDS (1993Si28) it was pointed out in the abstract section that 79 Se radioactivity was of importance in reactor--irradiated fuel composition and that its half--life was not well established. It was reported in only one secondary reference (1949PaZZ), the results of which were later questioned by 1993HeZW in a private communication to the evaluator. Perhaps, motivated by the comment made in 1993Si28, several measurements (mainly from one research group) have since been reported, some using AMS (accelerator mass spectrometry) technique. From the most recent study of 2001Ji04, the half--life of 79 Se isotope now seems as better established, although, results available from different publications are not in good agreement. In the opinion of the evaluator, further confirmatory measurements are still desirable. This evaluation supersedes earlier Nuclear Data Sheets for A=79 (1993Si28, 1982Si21,1975Ur03).
Nuclear Data Sheets Update for A = 79
1993, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass numer 79 (Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y) have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No data are yet available for excited states in ⁷⁹Cu and ⁷⁹Zn. This evaluation represents a revision of earlier ones (82Si21, 75Ur03). No data are available for ⁷⁹Ni, but calculations of %β⁻n and T_1/2(g.s) using RPA method have been reported by 89Kr02. The half -life of ⁷⁹Se has been quoted as ≤6.5×10⁴ y since 1949 (work by 49PaZZ). But a recent analysis (93HeZW) suggests that the half-life maybe longer by a factor of 10. A remeasurement of this half-life would be desirable since this isotope is of importance in reactor-irradiated fuel composition.
Nuclear data sheets update for A = 80
1992, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 80 (Zn, Ga, Ge, As, Se, br, Kr, Rb, Sr, Y, Zr) have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No data are yet available for excited states in ⁸⁰Zn and ⁸⁰Y. This evaluation represents a revision of earlier ones (82Si20, 75Gr19). No data are available for ⁸⁰Ni, but calculations of %β⁻ n and T_1/2 (g.s.) using RPA method have been reported by 89Kr02.
A severe disagreement is noted in the systematics (85Wa02) and measured (82De36, 81Li12) Q(ɛ) of ⁸⁰Y decay. A remeasurement of this value is required to clarify the difference of about 2 Mev.

^†: Supported in part by the US National Science Foundation.

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Mass excesses of 79As, 81As, and 80Ge

Abstract

Nucl. Phys.

At. Data and Nucl. Data Tables

Nucl. Instr.

Nucl. Phys.

At. Data and Nucl. Data Tables

At. Data and Nucl. Data Tables

At. Data and Nucl. Data Tables

At. Data and Nucl. Data Tables

At. Data and Nucl. Data Tables

Mass excesses of ⁷⁹As, ⁸¹As, and ⁸⁰Ge