Large $\ensuremath{\beta}$-Delayed One and Two Neutron Emission Rates in the Decay of $^{86}\mathrm{Ga}$

Large $β$ -Delayed One and Two Neutron Emission Rates in the Decay of ${}^{86}{Ga}$

K. Miernik, K. P. Rykaczewski, C. J. Gross, R. Grzywacz, M. Madurga, D. Miller, J. C. Batchelder, I. N. Borzov, N. T. Brewer, C. Jost, A. Korgul, C. Mazzocchi, A. J. Mendez, II, Y. Liu, S. V. Paulauskas, D. W. Stracener, J. A. Winger, M. Wolińska-Cichocka, and E. F. Zganjar

Phys. Rev. Lett. 111, 132502 – Published 24 September 2013

Abstract

Beta decay of ${}^{86}{Ga}$ was studied by means of $β$ -neutron- $γ$ spectroscopy. An isotopically pure ${}^{86}{Ga}$ beam was produced at the Holifield Radioactive Ion Beam Facility using a resonance ionization laser ion source and high-resolution electromagnetic separation. The decay of ${}^{86}{Ga}$ revealed a half-life of $43_{- 15}^{+ 21} ms$ and large $β$ -delayed one-neutron and two-neutron branching ratios of $P_{1 n} = 60 (10) %$ and $P_{2 n} = 20 (10) %$ . The $β γ$ decay of ${}^{86}{Ga}$ populated a 527 keV transition that is interpreted as the deexcitation of the first $2^{+}$ state in the $N = 54$ isotone ${}^{86}{Ge}$ and suggests a quick onset of deformation in Ge isotopes beyond $N = 50$ .

Received 1 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.132502

Authors & Affiliations

K. Miernik^1,2,*, K. P. Rykaczewski¹, C. J. Gross¹, R. Grzywacz^1,3, M. Madurga³, D. Miller³, J. C. Batchelder⁴, I. N. Borzov^1,5, N. T. Brewer^3,6, C. Jost³, A. Korgul², C. Mazzocchi², A. J. Mendez, II¹, Y. Liu¹, S. V. Paulauskas³, D. W. Stracener¹, J. A. Winger⁷, M. Wolińska-Cichocka^1,4,8, and E. F. Zganjar⁹

¹Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
²Faculty of Physics, University of Warsaw, Warsaw PL-00-681, Poland
³Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁴Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
⁵Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁶Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
⁷Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA
⁸Heavy Ion Laboratory, University of Warsaw, Warsaw PL-02-093, Poland
⁹Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA

^*krzysztof.miernik@fuw.edu.pl

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Vol. 111, Iss. 13 — 27 September 2013

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Physical Review Letters

Large β-Delayed One and Two Neutron Emission Rates in the Decay of Ga86

K. Miernik, K. P. Rykaczewski, C. J. Gross, R. Grzywacz, M. Madurga, D. Miller, J. C. Batchelder, I. N. Borzov, N. T. Brewer, C. Jost, A. Korgul, C. Mazzocchi, A. J. Mendez, II, Y. Liu, S. V. Paulauskas, D. W. Stracener, J. A. Winger, M. Wolińska-Cichocka, and E. F. Zganjar

Phys. Rev. Lett. 111, 132502 – Published 24 September 2013

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Large $β$ -Delayed One and Two Neutron Emission Rates in the Decay of ${}^{86}{Ga}$