Two-proton emission and related phenomena

Abstract

One of characteristic phenomena for nuclei beyond the proton dripline is the simultaneous emission of two protons (2\emph{p}). The current status of our knowledge of this most recently observed and the least known decay mode is presented. First, different approaches to theoretical description of this process, ranging from effective approximations to advanced three-body models are overviewed. Then, after a brief survey of main experimental methods to produce 2\emph{p}-emitting nuclei and techniques to study their decays, experimental findings in this research field are presented and discussed. This review covers decays of short-lived resonances and excited states of unbound nuclei as well as longer-lived, ground-state radioactive decays. In addition, more exotic decays like three- and four-proton emission are addressed. Finally, related few-body topics, like two-neutron and four-neutron radioactivity, and the problem of the tetraneutron are shortly discussed.

arXiv comment109 pages, 62 figures, accepted by Progress in Particle and Nuclear Physics

References in corpus (105)

• Universality in Few-body Systems with Large Scattering Length
• Three-body forces and the limit of oxygen isotopes
• Pairing in nuclear systems: from neutron stars to finite nuclei
• The R-matrix theory
• Radioactive decays at limits of nuclear stability
• Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within
• Microscopic Clustering in Light Nuclei
• Gamow Shell Model Description of Neutron-Rich Nuclei
• A nucleus-dependent valence-space approach to nuclear structure
• Identification and Separation of Radioactive Isotope Beams by the BigRIPS Separator at the RIKEN RI Beam Factory
• Ab initio limits of atomic nuclei
• Nonperturbative shell-model interactions from the in-medium similarity renormalization group
• Continuum effects and three-nucleon forces in neutron-rich oxygen isotopes
• Unified ab initio approaches to nuclear structure and reactions
• Bayesian approach to model-based extrapolation of nuclear observables
• Ab initio alpha-alpha scattering
• Pairing correlations in nuclei on the neutron-drip line
• Future of Nuclear Fission Theory
• Ab-initio coupled-cluster effective interactions for the shell model: Application to neutron-rich oxygen and carbon isotopes
• Gamow Shell Model Description of Weakly Bound Nuclei and Unbound Nuclear States
• Neutron drip line in the Ca region from Bayesian model averaging
• Mapping the proton drip-line up to A=70
• The detection of neutron clusters
• Continuum Shell Model
• Coexistence of BCS and BEC-like pair structures in halo nuclei
• Two-proton radioactivity
• Evidence for the ground-state resonance of 26O
• FaCE: a tool for Three Body Faddeev calculations with core excitation
• Ab-initio No-Core Gamow Shell Model calculations with realistic interactions
• On the discovery of doubly-magic ${}^{48}$Ni
• Theoretical description of deformed proton emitters: nonadiabatic coupled-channel method
• Can Modern Nuclear Hamiltonians Tolerate a Bound Tetraneutron?
• Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O
• Theory of the two-proton radioactivity in the continuum shell model
• Prediction for a four-neutron resonance
• Three-body continuum states on a Lagrange mesh
• Proton spectroscopy of 48Ni, 46Fe, and 44Cr
• Generic strong coupling behavior of Cooper pairs in the surface of superfluid nuclei
• On the possibility of generating a 4-neutron resonance with a {\boldmath $T=3/2$} isospin 3-neutron force
• Study of two-neutron radioactivity in the decay of 26O
• Is a Trineutron Resonance Lower in Energy than a Tetraneutron Resonance?
• Proton-proton correlations observed in two-proton decay of ${}^{19}$Mg and ${}^{16}$Ne
• Democratic decay of 6Be exposed by correlations
• Gamow and R-matrix Approach to Proton Emitting Nuclei
• Can tetraneutron be a narrow resonance?
• Analysis of the 16O(p,gamma)17F capture reaction using the shell model embedded in the continuum
• Charge radii and neutron correlations in helium halo nuclei
• Three-body decay of ${}^6$Be
• Non-exponential and oscillatory decays in quantum mechanics
• 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
• Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes
• Recent Progress in Two-proton Radioactivity
• On the origin of nuclear clustering
• Microscopic theory of the two-proton radioactivity
• Three-body structure of the low-lying ${}^{17}$Ne-states
• Continuum effects in neutron-drip-line oxygen isotopes
• Open problems in theory of nuclear open quantum systems
• First observation of unbound ${}^{11}$O, the mirror of the halo nucleus ${}^{11}$Li
• Correlated two-neutron emission in the decay of unbound nucleus 26O
• Ab initio Gamow in-medium similarity renormalization group with resonance and continuum
• Convenient location of a near-threshold proton-emitting resonance in ${}^{11}$B
• Lifetime and fragment correlations for the two-neutron decay of ${}^{26}$O ground state
• Nuclear properties with semilocal momentum-space regularized chiral interactions beyond N2LO
• An above-barrier narrow resonance in ${}^{15}$F
• Sub-threshold resonances in few-neutron systems
• Non-resonant Density of States Enhancement at Low Energies for Three or Four Neutrons
• Tetraneutron: Rigorous continuum calculation
• Role of diproton correlation in two-proton emission decay of the ${}^6$Be nucleus
• Three-cluster dynamics within an ab initio framework
• Identifying structures in the continuum: Application to ${}^{16}$Be
• Dependence of two-proton radioactivity on nuclear pairing models
• Chiral three-nucleon force and continuum for dripline nuclei and beyond
• Particle decays of levels in ${}^{11,12}$N and ${}^{12}$O investigated with the invariant-mass method
• Proton decays in ${}^{16}$Ne and ${}^{18}$Mg and isospin-symmetry breaking in carbon isotopes and isotones
• Three-body correlations in the ground-state decay of 26O
• Towards the Limits of Existence of Nuclear Structure: Observation and First spectroscopy of the Isotope ${}^{31}$K by measuring its three-proton Decay
• Nuclear three-body problem in the complex energy plane: Complex-Scaling-Slater method
• Multi-particle emission in the decay of 31Ar
• A Comprehensive Study of the Three- and Four-Neutron Systems at Low Energies
• Two-neutron overlap functions for 6He from a microscopic structure model
• \b{eta}-delayed three-proton decay of 31Ar
• Decay mechanism and lifetime of ${}^{67}$Kr
• Deep excursion beyond the proton dripline. I. Argon and chlorine isotope chains
• Comment on "Is a Trineutron Resonance Lower in Energy than a Tetraneutron Resonance?" [arXiv:1612.01502]
• Sizeable beta-strength in 31Ar(beta-3p) decay
• A Microscopic Cluster Description of 12C
• Isovector soft dipole mode in 6Be
• Lifetime of 26S and a limit for its 2p decay energy
• Observation of the ${}^7$H excited state
• Transition from direct to sequential two-proton decay in $s$-$d$ shell nuclei
• Are there good probes for the di-neutron correlation in light neutron-rich nuclei?
• Two-proton emission systematics
• Search for $2p$ decay of the first excited state of ${}^{17}$Ne
• Resonant states in ${}^7$H. I. Experimental studies of the ${}^2$H(${}^8$He,${}^3$He) reaction
• Blurred femtoscopy in two-proton decay
• Opening angle and dineutron correlations in knockout reactions with Borromean two-neutron halo nuclei
• Modelling double charge exchange response function for tetraneutron system
• Reply to Comment on "Is a Trineutron Resonance Lower in Energy than a Tetraneutron Resonance?"
• Few-body structures in the mirror nuclei, ${}^{11}$O and ${}^{11}$Li
• Deep excursion beyond the proton dripline. II. Toward the limits of existence of nuclear structure
• The Gamow-state description of the decay energy spectrum of neutron-unbound ${}^{25}$O
• Three-body correlations in direct reactions: Example of ${}^6$Be populated in $(p,n)$ reaction
• Asymptotic normalization coefficient method for two-proton radiative capture

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• Mirror Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al
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• Exploring the possible two-proton radioactivity of ${}^{38,39}$Ti
• Fast rotation of nuclei with extreme isospin in the vicinity of neutron and proton drip lines
• Direct observation of three-neutron emission from ${}^7$He${}^{\ast }$ and the search for the trineutron
• Radii of proton emitters
• Structure evolution of ground and excited states in the exotic nucleus ${}^{22}$Al