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Identification of Prompt Proton Emission in N = Z - 1 61Ga: Isospin Symmetry at the Limit of Nuclear Binding

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Bibliographic Details
Title: Identification of Prompt Proton Emission in N = Z - 1 61Ga: Isospin Symmetry at the Limit of Nuclear Binding
Authors: Hrabar, Y., Golubev, P., Rudolph, D., Sarmiento, L. G., Müller-Gatermann, C., Reviol, W., Seweryniak, D., Wu, J., Albers, H. M., Anderson, J. T., Bentley, M. A., Carlsson, B. G., Carpenter, M. P., Chiara, C. J., Copp, P. A., Cox, D. M., Ekman, J., Fahlander, C., Forsberg, U., Huang, T., Idini, A., Jayatissa, H., Lauritsen, T., Pereira-Lopez, X., Stolze, S., Uthayakumaar, S., Wilson, G. L.
Contributors: Lund University, Faculty of Science, Department of Physics, Particle and nuclear physics, Lunds universitet, Naturvetenskapliga fakulteten, Fysiska institutionen, Partikel- och kärnfysik, Originator, Lund University, Faculty of Science, Department of Physics, Mathematical Physics, Lunds universitet, Naturvetenskapliga fakulteten, Fysiska institutionen, Matematisk fysik, Originator
Source: Physical Review Letters Decay Modes of Exotic Nuclei. 135(22)
Subject Terms: Natural Sciences, Physical Sciences, Subatomic Physics, Naturvetenskap, Fysik, Subatomär fysik
Description: Excited states in the proton drip line nucleus 61Ga were populated via the fusion-evaporation reaction 24Mg(40Ca,p2n)61Ga. The experimental setup at Argonne National Laboratory comprised a novel combination of the Gammasphere array with two CD-shaped double-sided Si-strip detectors inside the Microball CsI(Tl) charged-particle detection array, as well as the Neutron-Shell liquid scintillators and the Fragment Mass Analyzer. Owing to the setup’s unprecedented in-beam proton spectroscopy and tracking capabilities, a coincidence between a 957.6(5)-keV γ ray and a 1.876(24)-MeV proton line was observed, which identifies the quasibound proton πg9/2 single-particle state in 61Ga at Ex = 2150(34) keV. This probes isospin symmetry at the limit of nuclear binding by providing a unique challenge for the shell-model interpretation of mirror nuclei beyond doubly magic 56Ni.
File Description: electronic
Access URL: https://lucris.lub.lu.se/ws/files/233935464/kwm2-9bmd.pdf
Database: SwePub
Description
Abstract:Excited states in the proton drip line nucleus 61Ga were populated via the fusion-evaporation reaction 24Mg(40Ca,p2n)61Ga. The experimental setup at Argonne National Laboratory comprised a novel combination of the Gammasphere array with two CD-shaped double-sided Si-strip detectors inside the Microball CsI(Tl) charged-particle detection array, as well as the Neutron-Shell liquid scintillators and the Fragment Mass Analyzer. Owing to the setup’s unprecedented in-beam proton spectroscopy and tracking capabilities, a coincidence between a 957.6(5)-keV γ ray and a 1.876(24)-MeV proton line was observed, which identifies the quasibound proton πg9/2 single-particle state in 61Ga at Ex = 2150(34) keV. This probes isospin symmetry at the limit of nuclear binding by providing a unique challenge for the shell-model interpretation of mirror nuclei beyond doubly magic 56Ni.
ISSN:10797114
DOI:10.1103/kwm2-9bmd