The Van Allen radiation belts are doughnut-shaped zones surrounding Earth, filled with highly energetic charged particles whose sources or loss mechanisms have been investigated for decades. As for the inner belt, cos...The Van Allen radiation belts are doughnut-shaped zones surrounding Earth, filled with highly energetic charged particles whose sources or loss mechanisms have been investigated for decades. As for the inner belt, cosmic ray albedo neutron decay(CRAND),radial diffusion, and local acceleration have been considered principal sources of electrons, whereas protons are predominantly from CRAND and solar protons. In this article, lightning-induced neutrons from Earth's upper atmosphere are suggested as a possible source of protons and electrons in the inner radiation belt. These terrestrial neutrons can contribute to the inner belt population by undergoing nuclear decay. Several approaches are proposed and discussed to evaluate the potential contribution of lightning-induced neutrons to the inner belt, including magnitude estimation, Monte Carlo simulations, and in situ observations. This article discusses some avenues of further study to determine the contribution of lightning-induced neutrons to the inner radiation belt.展开更多
In this paper, we describe a possible method for predicting the earthquakes, which is based on simultaneous recording of the intensity of fluxes of neutrons and charged particles by detectors, commonly used in nuclear...In this paper, we describe a possible method for predicting the earthquakes, which is based on simultaneous recording of the intensity of fluxes of neutrons and charged particles by detectors, commonly used in nuclear physics. These low-energy particles originate from radioactive nuclear processes in the Earth＇s crust. The variations in the particle flux intensity can be the precursor of the earth- quake. A description is given of an electronic installation that records the fluxes of charged particles in the radial direction, which are a possible response to the accumulated tectonic stresses in the Earth＇s crust. The obtained results showed an increase in the intensity of the fluxes for 10 or more hours before the occurrence of the earthquake. The previous version of the installation was able to indicate for the possibility of an earthquake （Maksudov et al. in Instrum Exp Tech 58：130-131, 2015）, but did not give information about the direction of the epicenter location. In this regard, the installation was modified by adding eight directional detectors. With the upgraded setup, we have received both the predictive signals, and signals determining the directions of the location of the forthcoming earthquake, starting 2-3 days before its origin.展开更多
A new method, while takes into account the contribution of direct neutron decay of analogue resonances to the isomeric ratio resulting from （p,n） reaction, is used to analyse the published experimental data for the ...A new method, while takes into account the contribution of direct neutron decay of analogue resonances to the isomeric ratio resulting from （p,n） reaction, is used to analyse the published experimental data for the reaction ^104Ru（p,n） ^104Rh and also estimate a minimum probability of direct decay.展开更多
Theβ-decay studies of neutron-rich 18,21N isotopes have been performed usingβ-n,β-γ,andβ-n-γcoincidence methods.The 18,21N ions were produced by the fragmentation of the 22Ne and 26Mg beams,respectively,on a thi...Theβ-decay studies of neutron-rich 18,21N isotopes have been performed usingβ-n,β-γ,andβ-n-γcoincidence methods.The 18,21N ions were produced by the fragmentation of the 22Ne and 26Mg beams,respectively,on a thick beryllium target.The time of flight of the emitted neutrons following theβ-decay of 18,21N was measured by a neutron detector system with wide energy detection range and low-energy detection threshold.In addition,several clover germanium detectors were used to detect theβ-delayedγ-rays.The half-lives of theβ-decays of 18N and 21N were determined to be(619±2)ms and(82.9±7.5)ms,respec tively.Several newβ-delayed neutron groups were observed with a total branching ratio of(6.98±1.46)%and(90.5±4.2)%for 18N and 21N,respectively.The level schemes of 18O and 21O were deduced.The experimental Gamow-Tellerβ-decay strengths of 18N and 21N to these levels were compared with the shell model calculations.展开更多
In this work,β~＋/EC decays of some medium-mass nuclei are investigated within the extended quasiparticle random-phase approximation（QRPA）,where neutron-neutron,proton-proton and neutron-proton（np） pairing correl...In this work,β~＋/EC decays of some medium-mass nuclei are investigated within the extended quasiparticle random-phase approximation（QRPA）,where neutron-neutron,proton-proton and neutron-proton（np） pairing correlations are taken into consideration in the specialized Hartree-Fock-Bogoliubov（HFB） transformation.In addition to the pairing interaction,the Br¨uckner G-matrix obtained with the charge-dependent Bonn nucleon-nucleon force is used for the residual particle-particle and particle-hole interactions.Calculations are performed for even-even proton-rich isotopes ranging from Z =24 to Z =34.It is found that the np pairing interaction plays a significant role inβ-decay for some nuclei far from stability.Compared with other theoretical calculations,our calculations show good agreement with the available experimental data.Predictions of β-decay half-lives for some very neutron-deficient nuclei are made for reference.展开更多
基金supported by the National Natural Science Foundation of China (No. 42225405 and No. 42350710200)。
文摘The Van Allen radiation belts are doughnut-shaped zones surrounding Earth, filled with highly energetic charged particles whose sources or loss mechanisms have been investigated for decades. As for the inner belt, cosmic ray albedo neutron decay(CRAND),radial diffusion, and local acceleration have been considered principal sources of electrons, whereas protons are predominantly from CRAND and solar protons. In this article, lightning-induced neutrons from Earth's upper atmosphere are suggested as a possible source of protons and electrons in the inner radiation belt. These terrestrial neutrons can contribute to the inner belt population by undergoing nuclear decay. Several approaches are proposed and discussed to evaluate the potential contribution of lightning-induced neutrons to the inner belt, including magnitude estimation, Monte Carlo simulations, and in situ observations. This article discusses some avenues of further study to determine the contribution of lightning-induced neutrons to the inner radiation belt.
文摘In this paper, we describe a possible method for predicting the earthquakes, which is based on simultaneous recording of the intensity of fluxes of neutrons and charged particles by detectors, commonly used in nuclear physics. These low-energy particles originate from radioactive nuclear processes in the Earth＇s crust. The variations in the particle flux intensity can be the precursor of the earth- quake. A description is given of an electronic installation that records the fluxes of charged particles in the radial direction, which are a possible response to the accumulated tectonic stresses in the Earth＇s crust. The obtained results showed an increase in the intensity of the fluxes for 10 or more hours before the occurrence of the earthquake. The previous version of the installation was able to indicate for the possibility of an earthquake （Maksudov et al. in Instrum Exp Tech 58：130-131, 2015）, but did not give information about the direction of the epicenter location. In this regard, the installation was modified by adding eight directional detectors. With the upgraded setup, we have received both the predictive signals, and signals determining the directions of the location of the forthcoming earthquake, starting 2-3 days before its origin.
文摘A new method, while takes into account the contribution of direct neutron decay of analogue resonances to the isomeric ratio resulting from （p,n） reaction, is used to analyse the published experimental data for the reaction ^104Ru（p,n） ^104Rh and also estimate a minimum probability of direct decay.
基金supported by the National Basic Research Program of China(Grant No.2007CB815002)the National Natural Science Foundation of China(Grant Nos.10775003,10475004,10735010,10775005,10875002,and 10827505)
文摘Theβ-decay studies of neutron-rich 18,21N isotopes have been performed usingβ-n,β-γ,andβ-n-γcoincidence methods.The 18,21N ions were produced by the fragmentation of the 22Ne and 26Mg beams,respectively,on a thick beryllium target.The time of flight of the emitted neutrons following theβ-decay of 18,21N was measured by a neutron detector system with wide energy detection range and low-energy detection threshold.In addition,several clover germanium detectors were used to detect theβ-delayedγ-rays.The half-lives of theβ-decays of 18N and 21N were determined to be(619±2)ms and(82.9±7.5)ms,respec tively.Several newβ-delayed neutron groups were observed with a total branching ratio of(6.98±1.46)%and(90.5±4.2)%for 18N and 21N,respectively.The level schemes of 18O and 21O were deduced.The experimental Gamow-Tellerβ-decay strengths of 18N and 21N to these levels were compared with the shell model calculations.
基金Supported by National Nature Science Foundation of China(11535004,11375086,11120101005,11175085 and 11235001)973 Nation Major State Basic Research and Development of China(2013CB834400)Science and Technology Development Fund of Macao(020/2014/A1 and 039/2013/A2)
文摘In this work,β~＋/EC decays of some medium-mass nuclei are investigated within the extended quasiparticle random-phase approximation（QRPA）,where neutron-neutron,proton-proton and neutron-proton（np） pairing correlations are taken into consideration in the specialized Hartree-Fock-Bogoliubov（HFB） transformation.In addition to the pairing interaction,the Br¨uckner G-matrix obtained with the charge-dependent Bonn nucleon-nucleon force is used for the residual particle-particle and particle-hole interactions.Calculations are performed for even-even proton-rich isotopes ranging from Z =24 to Z =34.It is found that the np pairing interaction plays a significant role inβ-decay for some nuclei far from stability.Compared with other theoretical calculations,our calculations show good agreement with the available experimental data.Predictions of β-decay half-lives for some very neutron-deficient nuclei are made for reference.
