The study of exotic decay modes of nuclei near the proton drip line is pivotal for nuclear-structure physics inunderstanding the role of isospin impurity in the states of outermost imbalance of the proton and neutron ...The study of exotic decay modes of nuclei near the proton drip line is pivotal for nuclear-structure physics inunderstanding the role of isospin impurity in the states of outermost imbalance of the proton and neutron numberswith respect to stable nuclei. In recent years, advancements in experimental technique permit us to reveal thestructure of these nuclei by researching -delayed one- and two-proton radioactivity[1]. The -delayed three-protondecay had even been discovered, see Ref. [2]. The mechanism of a -delayed decay involves rst a decay, withthe highest probability for a superallowed decay to the isobaric analogue state (IAS), followed by a proton ormulti-particle emission. This second-stage proton (or multi-particle) emission from the high-lying IAS is isospin-forbidden, while decay from Gamow-Teller populated states may proceed according to the isospin-symmetry limit.A precisely measured exotic decay scheme and branching ratios (BRs) for an isospin-forbidden and/or allowedparticle emission provide a stringent test and constraint for a microscopic approach that takes into account ofisospin non-conservation (INC) consistently in all considered physics processes, i.e., decay, proton emission andelectromagnetic de-excitation.展开更多
Recently, we have constructed a new set of isospin non-conserving (INC) shell-model Hamiltonians as a combinationof isospin conserving (IC) Hamiltonian, Coulomb interaction and effective isospin-symmetry breaking forc...Recently, we have constructed a new set of isospin non-conserving (INC) shell-model Hamiltonians as a combinationof isospin conserving (IC) Hamiltonian, Coulomb interaction and effective isospin-symmetry breaking forcesof nuclear origin[1]. The advantage is that Coulomb effects are taken into account with great care, thus the new ap-Fig. 1 (color online) The comparison of resonant rates of23Al(p;)24Si calculated by IC and INC Hamiltonians. TheINC Hamiltonians of OB+USD, OB+USDA, OB+USDBwere constructed in Ref. [5]; whereas (cd-USD), (cd-USDA),(cd-USDB) are INC Hamiltonians in Ref. [1]. USD, USDA,USDB are IC Hamiltonians in Ref. [6].proach allows one to describe more accurately and topredict unknown nuclear level schemes and decay modes.Since the approximate isospin-symmetry becomes broken,a realistic amount of isospin-mixing in nuclearstates is thus introduced. Among numerous applicationsto the structure of proton-rich nuclei, we usedthe new Hamiltonian to calculate resonant reaction andnon-resonant reaction (direct capture) rates of radiativeproton-capture reactions important for astrophysical rpprocess.展开更多
文摘The study of exotic decay modes of nuclei near the proton drip line is pivotal for nuclear-structure physics inunderstanding the role of isospin impurity in the states of outermost imbalance of the proton and neutron numberswith respect to stable nuclei. In recent years, advancements in experimental technique permit us to reveal thestructure of these nuclei by researching -delayed one- and two-proton radioactivity[1]. The -delayed three-protondecay had even been discovered, see Ref. [2]. The mechanism of a -delayed decay involves rst a decay, withthe highest probability for a superallowed decay to the isobaric analogue state (IAS), followed by a proton ormulti-particle emission. This second-stage proton (or multi-particle) emission from the high-lying IAS is isospin-forbidden, while decay from Gamow-Teller populated states may proceed according to the isospin-symmetry limit.A precisely measured exotic decay scheme and branching ratios (BRs) for an isospin-forbidden and/or allowedparticle emission provide a stringent test and constraint for a microscopic approach that takes into account ofisospin non-conservation (INC) consistently in all considered physics processes, i.e., decay, proton emission andelectromagnetic de-excitation.
文摘Recently, we have constructed a new set of isospin non-conserving (INC) shell-model Hamiltonians as a combinationof isospin conserving (IC) Hamiltonian, Coulomb interaction and effective isospin-symmetry breaking forcesof nuclear origin[1]. The advantage is that Coulomb effects are taken into account with great care, thus the new ap-Fig. 1 (color online) The comparison of resonant rates of23Al(p;)24Si calculated by IC and INC Hamiltonians. TheINC Hamiltonians of OB+USD, OB+USDA, OB+USDBwere constructed in Ref. [5]; whereas (cd-USD), (cd-USDA),(cd-USDB) are INC Hamiltonians in Ref. [1]. USD, USDA,USDB are IC Hamiltonians in Ref. [6].proach allows one to describe more accurately and topredict unknown nuclear level schemes and decay modes.Since the approximate isospin-symmetry becomes broken,a realistic amount of isospin-mixing in nuclearstates is thus introduced. Among numerous applicationsto the structure of proton-rich nuclei, we usedthe new Hamiltonian to calculate resonant reaction andnon-resonant reaction (direct capture) rates of radiativeproton-capture reactions important for astrophysical rpprocess.
