In this study,we reconstruct theγ-photon energy spectrum,which is in good agreement with the experimental data of ^(86)Kr+^(12)C at E/A=44 Me V within the framework of the modified EQMD model.The directed and ellipti...In this study,we reconstruct theγ-photon energy spectrum,which is in good agreement with the experimental data of ^(86)Kr+^(12)C at E/A=44 Me V within the framework of the modified EQMD model.The directed and elliptic flows of free protons and direct photons were investigated by considering theα-clustering structure of ^(12)C.Compared with free protons,direct photon flows provide clearer information about the early stage of a nuclear reaction.The difference in the collective flows between different configurations of ^(12)C is observed in this study.This indicates that the collective flows of direct photons are sensitive to the initial configuration.Therefore,theγbremsstrahlung process might be taken as an alternative probe to investigate theα-clustering structure in a light nucleus from heavy-ion collisions within the Fermienergy region.展开更多
Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical st...Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical structure as well as theα-clustering structures of^12C or^16O based on an extended quantum molecular dynamics model.The emission time sequence of neutrons and protons is indicated by the ratio of velocity-gated neutron-proton correlation functions,demonstrating its sensitivity toα-clustering structures.This work sheds light on a new probe forα-clustering structures.展开更多
The α-nucleus interaction is crucial in the description of α decay. Recently, we developed a pocket-type dynamical doublefolding potential(DDFP) that effectively incorporates both the surface-medium effect and inter...The α-nucleus interaction is crucial in the description of α decay. Recently, we developed a pocket-type dynamical doublefolding potential(DDFP) that effectively incorporates both the surface-medium effect and interior Pauli repulsion in α decay [H. Zheng et al., Phys. Rev. C 109, L011301(2024)]. This potential results in a pocket geometry within the nuclear surface region, which is consistent with the α-clustering characteristics predicted by microscopic calculations. In this study, the accuracy of the pocket-type DDFP was validated via systematic calculations of α-decay half-lives and an extended evaluation of the nuclear charge radii of the daughter nuclei. The results demonstrate good agreement with the experimental data for both quantities, thereby confirming the reliability of the DDFP model. Compared with calculations that use α-nucleus interactions derived from conventional double-folding procedures, DDFP employs fewer adjustable parameters to achieve a more accurate description of the charge radii based on the experimental α-decay energies.展开更多
Concise chemistry leads to a family of heptanuclear Co^(Ⅱ)-clusters,[Co_(7)(N_(3))_(12)(CH_(3)CN)_(12)][Y_(2)(NO_(3))_(4)(piv)_(4)]·2CH_(3)CN(DC1)(pivH=pivalic acid),[Co_(7)(N_(3))_(12)(CH_(3)CN)_(10)(NO_(3))_(0...Concise chemistry leads to a family of heptanuclear Co^(Ⅱ)-clusters,[Co_(7)(N_(3))_(12)(CH_(3)CN)_(12)][Y_(2)(NO_(3))_(4)(piv)_(4)]·2CH_(3)CN(DC1)(pivH=pivalic acid),[Co_(7)(N_(3))_(12)(CH_(3)CN)_(10)(NO_(3))_(0.4)(Cl)_(1.6)]·4CH_(3)CN(DC2)and[Co_(7)(N_(3))_(12)(CH_(3)CN)_(10)(NO_(3))_(2)]·4CH_(3)CN(DC3),in which the metal ions are exclusively bridged by end-on azido ligands to stabilize a beautiful disk-like topology.The resulting clusters exhibit interesting structural transformations and thermodynamically-distinct steady states verified by theoretical calcula-tions.Magnetic studies reveal the first observation of zero-field SMM behaviour in disk-like heptanuclear Co^(Ⅱ)complexes.展开更多
This paper reviews the author＇s recent works on the basic physics of cold fusion by the TSC （tetrahedral symmetric condensate） theory. Models of TSC formation conditions in condensed matter are first proposed. Seco...This paper reviews the author＇s recent works on the basic physics of cold fusion by the TSC （tetrahedral symmetric condensate） theory. Models of TSC formation conditions in condensed matter are first proposed. Secondly formulas for cold fusion rates per D（H）-cluster are explained with typical quantitative results. The 4D/TSC fusion and the 4H/TSC WS fusion are underlying mechanisms, respectively for the D （deuterium）-system and the H （protium）-system.展开更多
Third-order nonlinear optical(NLO)materials are critical for applications such as optical limiting,all-optical switching,and ultrafast photonic devices,yet their performance remains constrained by the intricate balanc...Third-order nonlinear optical(NLO)materials are critical for applications such as optical limiting,all-optical switching,and ultrafast photonic devices,yet their performance remains constrained by the intricate balance between electronic delocalization and dimensional synergy.This study demonstrates a multidimensional assembly strategy to engineer aromatic synergy in osmium-organic π-clusters,achieving unprecedented enhancement of third-order NLO response.Guided by the concept of metal-organicπ-cluster,we design a prototypical Os3-plane unit as a foundational building block.Through horizontal covalent extension(C-C bonding)and vertical metallophilic stacking(Os─Os interactions),four hierarchical architectures(Os6-prism,Os6-plane,Os9-prism,and Os9-plane)are constructed,each exhibiting amplified NLO properties.Systematic analysis reveals that horizontal assembly enhances in-planeπ-conjugation through quasi-two-dimensionalπ-delocalization,while vertical stacking facilitates interlayerπ-orbital overlap.The novel structure,constructed via amultidimensional assembly strategy,exhibits a narrow HOMO-LUMO gap.The expandedπ-delocalization reduces exciton binding energy,promotes electron delocalization,and consequently yields a stronger third-order NLO response.The Os9-plane exhibits excellent third-order NLO response coefficient(γ=2.93×10^(7) a.u.),which is two orders of magnitude higher than that of the Os3-plane.This work establishes a paradigm of synergistic integration between multidimensional assembly and aromatic π-conjugation for enhanced NLO performance,opening new avenues for optoelectronic material design.展开更多
The α-cluster structures for 12^C and 16^O are investigated in the framework of the covariant density functional theory, where the pairing correlation is treated with a particle number conserving shell-model-like app...The α-cluster structures for 12^C and 16^O are investigated in the framework of the covariant density functional theory, where the pairing correlation is treated with a particle number conserving shell-model-like approach. The ground states of 12^C and 160 have been calculated and the density distributions demonstrate an equilateral triangle 3α clustering for 12^C and a regular tetrahedron 4α clustering for 16^O The existence of linear nα chain structure of both 12^C and 16^O is revealed at high quadrupole deformation.展开更多
The important features of the low-lying states of C are obtained via an analysis of quantum mechanical symmetry. The existence of a 4 state lower than the 4] state is found to be essential to judging the validity of t...The important features of the low-lying states of C are obtained via an analysis of quantum mechanical symmetry. The existence of a 4 state lower than the 4] state is found to be essential to judging the validity of the Set model of 12C. It is pointed out that the states can be candidates of the linear chain structure.展开更多
We explain how to treat a microscopic wave function of α-condensation taking a 3α-nucleus as a typical example. The wave function has been originally proposed ten years before by Horiuehi, Ropke, Schuck and the pres...We explain how to treat a microscopic wave function of α-condensation taking a 3α-nucleus as a typical example. The wave function has been originally proposed ten years before by Horiuehi, Ropke, Schuck and the present author （Phys. Rev. Lett., 2001, 87： 192501）. The microscopic model, which fully takes into account the Pauli principle between all the constituent nucleons, effective inter- nucleon forces and the Coulomb force, can play an important role in reproducing an α-gas nature thanks to α-condensation as an excited state of α-like nuclei. An essential point of the wave function is to describe their ground state simultaneously. We study its typical features by giving an analytical formula of the norm kernel and the kernel concerning the one-body operator for 3α-condensation.展开更多
基金supported by the Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030008)the National Natural Science Foundation of China(Nos.11890710,11890714,and 11961141003)the Strategic Priority Research Program of the CAS(No.XDB34000000)。
文摘In this study,we reconstruct theγ-photon energy spectrum,which is in good agreement with the experimental data of ^(86)Kr+^(12)C at E/A=44 Me V within the framework of the modified EQMD model.The directed and elliptic flows of free protons and direct photons were investigated by considering theα-clustering structure of ^(12)C.Compared with free protons,direct photon flows provide clearer information about the early stage of a nuclear reaction.The difference in the collective flows between different configurations of ^(12)C is observed in this study.This indicates that the collective flows of direct photons are sensitive to the initial configuration.Therefore,theγbremsstrahlung process might be taken as an alternative probe to investigate theα-clustering structure in a light nucleus from heavy-ion collisions within the Fermienergy region.
基金Partially supported by the National Natural Science Foundation of China(11890714,11421505,11905284,11961141003)the Strategic Priority Research Program of the CAS(XDB34030200,XDB16)the Key Research Program of Frontier Sciences of the CAS(QYZDJ-SSW-SLH002)。
文摘Neutron-proton momentum correlation functions are constructed from a three-body photodisintegration channel,i.e.,core+n+p,and used to explore the spatial-time information of the non-clustering Woods-Saxon spherical structure as well as theα-clustering structures of^12C or^16O based on an extended quantum molecular dynamics model.The emission time sequence of neutrons and protons is indicated by the ratio of velocity-gated neutron-proton correlation functions,demonstrating its sensitivity toα-clustering structures.This work sheds light on a new probe forα-clustering structures.
基金supported by the National Natural Science Foundation of China(Nos.12035011,11975167,12175151,12005139,11947123)the Guangdong Major Project of Basic and Applied Basic Research(No.2021B0301030006)the Steady Support Program for Higher Education Institutions of Shenzhen(Nos.20200810163629001,20200817005440001).
文摘The α-nucleus interaction is crucial in the description of α decay. Recently, we developed a pocket-type dynamical doublefolding potential(DDFP) that effectively incorporates both the surface-medium effect and interior Pauli repulsion in α decay [H. Zheng et al., Phys. Rev. C 109, L011301(2024)]. This potential results in a pocket geometry within the nuclear surface region, which is consistent with the α-clustering characteristics predicted by microscopic calculations. In this study, the accuracy of the pocket-type DDFP was validated via systematic calculations of α-decay half-lives and an extended evaluation of the nuclear charge radii of the daughter nuclei. The results demonstrate good agreement with the experimental data for both quantities, thereby confirming the reliability of the DDFP model. Compared with calculations that use α-nucleus interactions derived from conventional double-folding procedures, DDFP employs fewer adjustable parameters to achieve a more accurate description of the charge radii based on the experimental α-decay energies.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.21863009,22063008)the Natural Science Foundation of Ningxia Province(Nos.2023AAC03014,2023AAC03227,2021AAC03136,2021BEB04062)+1 种基金the Young Top-notch Talent Cultivation Program of Ningxia Province,the Discipline Project of Ningxia(No.NXYLXK2017A04)the China Postdoctoral Science Foundation(No.2022M723148).
文摘Concise chemistry leads to a family of heptanuclear Co^(Ⅱ)-clusters,[Co_(7)(N_(3))_(12)(CH_(3)CN)_(12)][Y_(2)(NO_(3))_(4)(piv)_(4)]·2CH_(3)CN(DC1)(pivH=pivalic acid),[Co_(7)(N_(3))_(12)(CH_(3)CN)_(10)(NO_(3))_(0.4)(Cl)_(1.6)]·4CH_(3)CN(DC2)and[Co_(7)(N_(3))_(12)(CH_(3)CN)_(10)(NO_(3))_(2)]·4CH_(3)CN(DC3),in which the metal ions are exclusively bridged by end-on azido ligands to stabilize a beautiful disk-like topology.The resulting clusters exhibit interesting structural transformations and thermodynamically-distinct steady states verified by theoretical calcula-tions.Magnetic studies reveal the first observation of zero-field SMM behaviour in disk-like heptanuclear Co^(Ⅱ)complexes.
文摘This paper reviews the author＇s recent works on the basic physics of cold fusion by the TSC （tetrahedral symmetric condensate） theory. Models of TSC formation conditions in condensed matter are first proposed. Secondly formulas for cold fusion rates per D（H）-cluster are explained with typical quantitative results. The 4D/TSC fusion and the 4H/TSC WS fusion are underlying mechanisms, respectively for the D （deuterium）-system and the H （protium）-system.
基金supported by the National Natural Science Foundation of China(22571298,U23A2095,and 92161105)the Postdoctoral Fellowship Program(Grade C)of China Postdoctoral Science Foundation under Grant Number GZC20241834.
文摘Third-order nonlinear optical(NLO)materials are critical for applications such as optical limiting,all-optical switching,and ultrafast photonic devices,yet their performance remains constrained by the intricate balance between electronic delocalization and dimensional synergy.This study demonstrates a multidimensional assembly strategy to engineer aromatic synergy in osmium-organic π-clusters,achieving unprecedented enhancement of third-order NLO response.Guided by the concept of metal-organicπ-cluster,we design a prototypical Os3-plane unit as a foundational building block.Through horizontal covalent extension(C-C bonding)and vertical metallophilic stacking(Os─Os interactions),four hierarchical architectures(Os6-prism,Os6-plane,Os9-prism,and Os9-plane)are constructed,each exhibiting amplified NLO properties.Systematic analysis reveals that horizontal assembly enhances in-planeπ-conjugation through quasi-two-dimensionalπ-delocalization,while vertical stacking facilitates interlayerπ-orbital overlap.The novel structure,constructed via amultidimensional assembly strategy,exhibits a narrow HOMO-LUMO gap.The expandedπ-delocalization reduces exciton binding energy,promotes electron delocalization,and consequently yields a stronger third-order NLO response.The Os9-plane exhibits excellent third-order NLO response coefficient(γ=2.93×10^(7) a.u.),which is two orders of magnitude higher than that of the Os3-plane.This work establishes a paradigm of synergistic integration between multidimensional assembly and aromatic π-conjugation for enhanced NLO performance,opening new avenues for optoelectronic material design.
基金Supported by Major State Basic Research Development (973) Program (2007CB815000)NSFC (11175002,11105005)Research Fund for the Doctoral Program of Higher Education (20110001110087)
文摘The α-cluster structures for 12^C and 16^O are investigated in the framework of the covariant density functional theory, where the pairing correlation is treated with a particle number conserving shell-model-like approach. The ground states of 12^C and 160 have been calculated and the density distributions demonstrate an equilateral triangle 3α clustering for 12^C and a regular tetrahedron 4α clustering for 16^O The existence of linear nα chain structure of both 12^C and 16^O is revealed at high quadrupole deformation.
基金Project supprted by the National Natural Science Foundation of China and the Natural Science Foundation of Guangdong Province.
文摘The important features of the low-lying states of C are obtained via an analysis of quantum mechanical symmetry. The existence of a 4 state lower than the 4] state is found to be essential to judging the validity of the Set model of 12C. It is pointed out that the states can be candidates of the linear chain structure.
文摘We explain how to treat a microscopic wave function of α-condensation taking a 3α-nucleus as a typical example. The wave function has been originally proposed ten years before by Horiuehi, Ropke, Schuck and the present author （Phys. Rev. Lett., 2001, 87： 192501）. The microscopic model, which fully takes into account the Pauli principle between all the constituent nucleons, effective inter- nucleon forces and the Coulomb force, can play an important role in reproducing an α-gas nature thanks to α-condensation as an excited state of α-like nuclei. An essential point of the wave function is to describe their ground state simultaneously. We study its typical features by giving an analytical formula of the norm kernel and the kernel concerning the one-body operator for 3α-condensation.
