Decay of a <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>z</mi></mrow></msub></mrow><mo>=</mo><mo>−</mo><mn>2</mn><mn></mn></math></span> Nucleus: Argon-32

E. Hagberg; P. G. Hansen; J. C. Hardy; A. Huck; B. Jonson; S. Mattsson; H. L. Ravn; P. Tidemand-Petersson; G. Walter

doi:10.1103/PhysRevLett.39.792

Decay of a $T_{z} = - 2$ Nucleus: Argon-32

E. Hagberg, P. G. Hansen, J. C. Hardy, A. Huck, B. Jonson, S. Mattsson, H. L. Ravn, P. Tidemand-Petersson, and G. Walter

Phys. Rev. Lett. 39, 792 – Published 26 September 1977

Abstract

$β$ -delayed protons have been observed from ${}^{32}{Ar}$ ( $t_{\frac{1}{2}} \sim 75$ msec), the most neutron-deficient nucleus whose radioactive decay has ever been recorded. From the proton spectrum, the $T = 2$ state in ${}^{32}{Cl}$ has been identified to have a mass excess of -8295.6±5.2 keV. As the fourth accurately known member of an isobaric quintet, it provides an accurate test for a cubic term in the isobaric-multiplet mass equation as applied to narrow $T = 2$ states: The coefficient of such a possible term is determined to be 0.5±2.5 keV.

Received 6 July 1977

DOI:https://doi.org/10.1103/PhysRevLett.39.792

Authors & Affiliations

E. Hagberg^*, P. G. Hansen^†, J. C. Hardy^‡, A. Huck^§, B. Jonson^*, S. Mattsson^∥, H. L. Ravn, P. Tidemand-Petersson, and G. Walter^§

The ISOLDE Collabration, CERN, Geneva, Switzerland

^*On leave from the Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
^†On leave from the Institute of Physics, University of Aarhus, Aarhus, Denmark.
^‡On leave from Atomic Energy of Canada Limited, Chalk River Nuclear Laboratories, Chalk River, Ont., Can.
^§Permanent address: Centre de Recherches Nucléaires, Groupe PNE, Strasbourg, France.
^∥Permanent address: Department of Physics, Chalmers University of Technology, Göteborg, Sweden.