First observation of two-proton radioactivity in $^{48}\mathrm{Ni}$

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First observation of two-proton radioactivity in ${}^{48}{Ni}$

M. Pomorski, M. Pfützner, W. Dominik, R. Grzywacz, T. Baumann, J. S. Berryman, H. Czyrkowski, R. Dąbrowski, T. Ginter, J. Johnson, G. Kamiński, A. Kuźniak, N. Larson, S. N. Liddick, M. Madurga, C. Mazzocchi, S. Mianowski, K. Miernik, D. Miller, S. Paulauskas, J. Pereira, K. P. Rykaczewski, A. Stolz, and S. Suchyta

Phys. Rev. C 83, 061303(R) – Published 27 June 2011

An article within the collection: Physical Review C 50^th Anniversary Milestones

Abstract

The decay of the extremely neutron-deficient ${}^{48}{Ni}$ was studied by means of an imaging time-projection chamber, which allowed the recording of tracks of charged particles. The decays of six atoms were observed. Four of them clearly correspond to two-proton radioactivity, providing the first direct evidence for this decay mode in ${}^{48}{Ni}$ . Two decays represent $β$ -delayed proton emission. The half-life of ${}^{48}{Ni}$ is determined to be $T_{1 / 2} = 2 . 1_{- 0.4}^{+ 1.4}$ ms.

Received 25 May 2011

DOI:https://doi.org/10.1103/PhysRevC.83.061303

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Physical Review C 50^th Anniversary Milestones

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Authors & Affiliations

M. Pomorski¹, M. Pfützner^1,*, W. Dominik¹, R. Grzywacz^2,3, T. Baumann⁴, J. S. Berryman⁴, H. Czyrkowski¹, R. Dąbrowski¹, T. Ginter⁴, J. Johnson³, G. Kamiński^5,6, A. Kuźniak^2,1, N. Larson^4,7, S. N. Liddick^4,7, M. Madurga², C. Mazzocchi¹, S. Mianowski¹, K. Miernik^3,1, D. Miller², S. Paulauskas², J. Pereira⁴, K. P. Rykaczewski³, A. Stolz⁴, and S. Suchyta^4,7

¹Faculty of Physics, University of Warsaw, PL-00-681 Warsaw, Poland
²Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
³Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
⁵Institute of Nuclear Physics PAN, PL-31-342 Kraków, Poland
⁶Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
⁷Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

^*pfutzner@fuw.edu.pl

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Vol. 83, Iss. 6 — June 2011

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Physical Review C

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First observation of two-proton radioactivity in Ni48

Phys. Rev. C 83, 061303(R) – Published 27 June 2011

An article within the collection: Physical Review C 50th Anniversary Milestones

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Physical Review C 50th Anniversary Milestones

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First observation of two-proton radioactivity in ${}^{48}{Ni}$

An article within the collection: Physical Review C 50^th Anniversary Milestones

Physical Review C 50^th Anniversary Milestones