Springer LINK: The European Physical Journal A - Abstract Volume 2 Issue 2 (1998) pp 173-177

The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

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Abstract Volume 2 Issue 2 (1998) pp 173-177

nuclear structure: Direct mass measurements of A=80 isobars

S. Issmer (1), M. Fruneau (2), J.A. Pinston (2), M. Asghar (2), D. Barnéoud (2), J. Genevey (2), Th. Kerscher (1), K.E.G. Löbner (1)

(1) Sektion Physik, Universität München, D-85748 Garching, Germany
(2) Institut des Sciences Nucléaires, Université Joseph Fourier, CNRS-IN2P3, F-38026 Grenoble Cedex, France

Received: 22 Juli 1997 / Revised version: 3 February 1998

Abstract: Direct mass measurements of A=80 isobars were performed using the second cyclotron of SARA (Système Accélérateur Rhône-Alpes) of the ISN (Institut des Sciences Nucléaires) in Grenoble as a time-of-flight mass spectrometer. Using the 300 MeV ⁵⁸Ni + ²⁷Al reaction, the isobars ⁸⁰Rb, ⁸⁰Sr, ⁸⁰Y, and ⁸⁰Zr (only one event!) were measured. For ⁸⁰Y we found a mass value of 79.934320(180) u, corresponding to a decay energy Q (⁸⁰Y -> ⁸⁰Sr) of (9120 ± 170) keV. Comparing this value to the former experiments of Lister et al. and Della Negra et al. results in a difference of about 2.2 MeV. However, it does agree with the recommended value of Audi and Wapstra, which is derived from systematic trends. For ⁸⁰Zr the single event was identified with a probability of 0.999975 and a mass value of 79.940400(1600) u could be deduced from our experiment.

PACS:

Communicated by P. Armbruster

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