First observation of 54Zn and its decay by two-proton emission

Abstract

The nucleus 54Zn has been observed for the first time in an experiment at the SISSI/LISE3 facility of GANIL in the quasi-fragmentation of a 58Ni beam at 74.5 MeV/nucleon in a natNi target. The fragments were analysed by means of the ALPHA-LISE3 separator and implanted in a silicon-strip detector where correlations in space and time between implantation and subsequent decay events allowed us to generate almost background free decay spectra for about 25 different nuclei at the same time. Eight 54Zn implantation events were observed. From the correlated decay events, the half-life of 54Zn is determined to be 3.2 +1.8/-0.8 ms. Seven of the eight implantations are followed by two-proton emission with a decay energy of 1.48(2) MeV. The decay energy and the partial half-life are compared to model predictions and allow for a test of these two-proton decay models.

4 pages, 4 figures, accepted for publication in PRL

References in corpus (4)

• New effective interaction for $pf$-shell nuclei and its implications for the stability of the $N$=$Z$=28 closed core
• Proton Drip-Line Calculations and the Rp-process
• Mapping the proton drip-line up to A=70
• Decay of proton-rich nuclei between 39Ti and 49Ni

Cited by in corpus (37)

• Radioactive decays at limits of nuclear stability
• Two-proton radioactivity
• Theory of the two-proton radioactivity in the continuum shell model
• Proton spectroscopy of 48Ni, 46Fe, and 44Cr
• Two-proton radioactivity and three-body decay. III. Integral formulae for decay widths in a simplified semianalytical approach
• Investigations of three, four, and five-particle exit channels of levels in light nuclei created using a 9C beam
• Three-body decay of ${}^6$Be
• The landscape of two-proton radioactivity
• First direct observation of two protons in the decay of ${}^{45}$Fe with a TPC
• Two-proton radioactivity within a generalized liquid drop model
• Recent Progress in Two-proton Radioactivity
• Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei
• The puzzling two-proton decay of ${}^{67}$Kr
• Two-Proton Radioactivity with 2p halo in light mass nuclei A$=$18$-$34
• New neutron-deficient isotopes from ${}^{78}$Kr fragmentation
• Study of two-proton radioactivity within the relativstic mean-field plus bcs approach
• Three-body resonant radiative capture reactions in astrophysics
• Proton decays in ${}^{16}$Ne and ${}^{18}$Mg and isospin-symmetry breaking in carbon isotopes and isotones
• Two-nucleon emitters within a pseudostate method: The case of ${}^6$Be and ${}^{16}$Be
• Towards the Limits of Existence of Nuclear Structure: Observation and First spectroscopy of the Isotope ${}^{31}$K by measuring its three-proton Decay
• Three-body model for the two-neutron decay of ${}^{16}$Be
• Two-proton radioactivity of exotic nuclei beyond proton drip-line
• Two-proton radioactivity within Coulomb and proximity potential model
• Systematic study of two-proton radioactivity half-lives within the two-potential approach with Skyrme-Hartree-Fock
• Anatomy of three-body decay III. Energy distributions
• Spectroscopy of ${}^{18}$Na: Bridging the two-proton radioactivity of ${}^{19}$Mg
• Study of Neutron Magic Drip-Line Nuclei within Relativistic Mean Field plus BCS Approach
• Lifetime of 26S and a limit for its 2p decay energy
• Spectroscopy of excited states of unbound nuclei ${}^{30}$Ar and ${}^{29}$Cl
• Two-proton emission systematics
• Blurred femtoscopy in two-proton decay
• Isobaric-multiplet mass equation in a macroscopic-microscopic approach
• Extended R-matrix description of two-proton radioactivity
• Deformation dependence of 2p-radioactivity half-lives: Probe with a new formula across the mass region with Z<82
• Gamow shell model study of the 17Ne(p, p) reaction and of isospin symmetry breaking in 18Na
• Semi-microscopic theory of two proton emission
• Systematic study of two-proton radioactivity with a screened electrostatic barrier