<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>31</mn></mrow></msup></mrow><mi mathvariant="normal">Ar</mi></math></span> examined: New limit on the β-delayed three-proton branch

the ISOLDE Collaboration; H. O. U. Fynbo; L. Axelsson; J. Äystö; M. J. G. Borge; L. M. Fraile; A. Honkanen; P. Hornshøj; Y. Jading; A. Jokinen; B. Jonson; I. Martel; I. Mukha; T. Nilsson; G. Nyman; M. Oinonen; K. Riisager; T. Siiskonen; M. H. Smedberg; O. Tengblad; F. Wenander

doi:10.1103/PhysRevC.59.2275

$^{31} Ar$ examined: New limit on the β-delayed three-proton branch

H. O. U. Fynbo, L. Axelsson, J. Äystö, M. J. G. Borge, L. M. Fraile, A. Honkanen, P. Hornshøj, Y. Jading, A. Jokinen, B. Jonson, I. Martel, I. Mukha, T. Nilsson, G. Nyman, M. Oinonen, K. Riisager, T. Siiskonen, M. H. Smedberg, O. Tengblad, and F. Wenander (the ISOLDE Collaboration)

Phys. Rev. C 59, 2275 – Published 1 April 1999

Abstract

We have remeasured the decay of $^{31} Ar$ with a setup sensitive to multiparticle decay branches and obtained a new limit of $1.1 \times 10^{- 3}$ (99% C.L.) on the β-delayed three-proton branch between the isobaric analog state in $^{31} Cl$ and the ground state of $^{28} Si$ . This a factor of 17 below the previously reported first observation of β-delayed three-proton emission $in^{31} Ar$ . The limit on a possible $β 3 p$ branch to the first excited state in $^{28} Si$ is $2.9 \times 10^{- 4}$ .

Received 17 December 1998

DOI:https://doi.org/10.1103/PhysRevC.59.2275

Authors & Affiliations

H. O. U. Fynbo¹, L. Axelsson², J. Äystö³, M. J. G. Borge⁴, L. M. Fraile⁴, A. Honkanen^3,*, P. Hornshøj¹, Y. Jading⁵, A. Jokinen³, B. Jonson², I. Martel^5,†, I. Mukha^1,‡, T. Nilsson^2,§, G. Nyman², M. Oinonen^3,§, K. Riisager¹, T. Siiskonen³, M. H. Smedberg², O. Tengblad⁴, and F. Wenander^2,5 (the ISOLDE Collaboration)

¹Institut for Fysik og Astronomi, Aarhus Universitet, Denmark
²Fysiska Institutionen, Chalmers Tekniska Högskola, Göteborg, Sweden
³Department of Physics, University of Jyväskylä, Finland
⁴Instituto de Estructura de la Materia, CSIC, Madrid, Spain
⁵EP Division, CERN, Genève, Switzerland

^*Present address: Helsinki Institute of Physics, University of Helsinki, P.O. Box 9, FIN-00014, Finland.
^†Present address: University of Sevilla, Sevilla, Spain.
^‡Permanent address: Kurchatov Institute, 123182 Moscow, Russia.
^§Present address: EP Division, CERN, Genève, Switzerland.

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Vol. 59, Iss. 4 — April 1999

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