The presolar SiC grains[1]carry the original stellar nucleosynthesis signature.Their isotopic anomalies compared to the sun are the strong constrains in the supernovae(SN)model calculations.The 15N-excess in some SiC-...The presolar SiC grains[1]carry the original stellar nucleosynthesis signature.Their isotopic anomalies compared to the sun are the strong constrains in the supernovae(SN)model calculations.The 15N-excess in some SiC-AB grains(12C/13C<10 and 14N/15N<272)is one of the challenges of core-collapse supernovae(CCSNe)models[2].Recently,Pignatari pointed out that the entrainment of H-rich material into the He shell before the SN explosion allows the coproduction of 13C,15N and 26Al,which provides a new production scenario for SiC-AB grains[2].In the He shell nucleosynthesis,the 13C is produced through 12C(p,γ)13N(β+γ)13C reaction.The 14N is synthesized through 13N(n,γ)and 13C(p,γ)reactions.展开更多
First measurement of the angular distribution of breakup reaction for^(8)B on a^(208)Pb target at an energy around four times of Coulomb barrier was carried out at the National Laboratory of Heavy Ion Research of Inst...First measurement of the angular distribution of breakup reaction for^(8)B on a^(208)Pb target at an energy around four times of Coulomb barrier was carried out at the National Laboratory of Heavy Ion Research of Institute of Modern Physics.展开更多
The understanding of open quantum systems in unbound nuclei is a challenge to the nuclear structure research[1].The continuum coupling effect may lead to a reordering of the shells in such systems[2].A way to study th...The understanding of open quantum systems in unbound nuclei is a challenge to the nuclear structure research[1].The continuum coupling effect may lead to a reordering of the shells in such systems[2].A way to study this effect is to compare the level schemes of two mirror nuclei involving an unbound and a bound nucleus such as 16F and 16N[3].Here we report an experiment of studying the level properties of 16F using the resonant elastic scattering with an 15O radioactive beam delivered by the Radioactive Ion Beam Line at Lanzhou(RIBLL)[4].展开更多
With the development of radioactive beam facilities,several exciting results were provided concerning the understanding of fundamental nuclear physics.However,typical-beam intensities are always low and the production...With the development of radioactive beam facilities,several exciting results were provided concerning the understanding of fundamental nuclear physics.However,typical-beam intensities are always low and the production is often in very small quantities,so,new generation detectors need to be developed with large solid angle and angular coverage,which can identify particle effectively as well as possesses high energy resolution,high spatial resolution and high geometric efficiency.The new detector based on Double Side Silicon Strip Detector(DSSD)is foreseen for the study of the reaction production in the experiment of direct nuclear reaction above the Coulomb barrier using RIBLL[1,2]at the HIRFL[3,4].However,the disadvantage of the RIBs is that it has a broad distribution in coordinate spaces.Therefore,new detector system with high resolution and a large solid angle was developed successfully for performing nuclear reaction experiments using RIBs.The geometric efficiency of the new detector array with 5 large area DSSD telescopes increases up to 70%.展开更多
The Rare-Isotope Beam(RIB)Physics Laboratory at IMP has made steady progress in 2022 in the following five aspects.1.Nuclear structure and reaction studies with intermediate-and low-energy RI beams.Measurements of cha...The Rare-Isotope Beam(RIB)Physics Laboratory at IMP has made steady progress in 2022 in the following five aspects.1.Nuclear structure and reaction studies with intermediate-and low-energy RI beams.Measurements of charge-changing cross-sections(CCCS)of^(30-36)P on a^(nat)C target were successfully performed at beam energies around 200-300 MeV/nucleon at the External Target Facility(ETF)of HIRFL to investigate the effect of the N=20 shell closure.展开更多
基金National Key Research and Development program(MOST 2016YFA0400501),National Natural Science Foundation of China(11490564).
文摘The presolar SiC grains[1]carry the original stellar nucleosynthesis signature.Their isotopic anomalies compared to the sun are the strong constrains in the supernovae(SN)model calculations.The 15N-excess in some SiC-AB grains(12C/13C<10 and 14N/15N<272)is one of the challenges of core-collapse supernovae(CCSNe)models[2].Recently,Pignatari pointed out that the entrainment of H-rich material into the He shell before the SN explosion allows the coproduction of 13C,15N and 26Al,which provides a new production scenario for SiC-AB grains[2].In the He shell nucleosynthesis,the 13C is produced through 12C(p,γ)13N(β+γ)13C reaction.The 14N is synthesized through 13N(n,γ)and 13C(p,γ)reactions.
基金National Natural Science Foundation of China(U1632138,11575256,11605253,11705242)。
文摘First measurement of the angular distribution of breakup reaction for^(8)B on a^(208)Pb target at an energy around four times of Coulomb barrier was carried out at the National Laboratory of Heavy Ion Research of Institute of Modern Physics.
基金National Key Research and Development Program of China(2016YFA0400503).
文摘The understanding of open quantum systems in unbound nuclei is a challenge to the nuclear structure research[1].The continuum coupling effect may lead to a reordering of the shells in such systems[2].A way to study this effect is to compare the level schemes of two mirror nuclei involving an unbound and a bound nucleus such as 16F and 16N[3].Here we report an experiment of studying the level properties of 16F using the resonant elastic scattering with an 15O radioactive beam delivered by the Radioactive Ion Beam Line at Lanzhou(RIBLL)[4].
文摘With the development of radioactive beam facilities,several exciting results were provided concerning the understanding of fundamental nuclear physics.However,typical-beam intensities are always low and the production is often in very small quantities,so,new generation detectors need to be developed with large solid angle and angular coverage,which can identify particle effectively as well as possesses high energy resolution,high spatial resolution and high geometric efficiency.The new detector based on Double Side Silicon Strip Detector(DSSD)is foreseen for the study of the reaction production in the experiment of direct nuclear reaction above the Coulomb barrier using RIBLL[1,2]at the HIRFL[3,4].However,the disadvantage of the RIBs is that it has a broad distribution in coordinate spaces.Therefore,new detector system with high resolution and a large solid angle was developed successfully for performing nuclear reaction experiments using RIBs.The geometric efficiency of the new detector array with 5 large area DSSD telescopes increases up to 70%.
基金Upgrade Program for Infrastructure of Large Scale Facilities,CAS(DSS-WXGZ-2018-0002)Youth Innovation Promotion Association of Chinese Academy of Sciences(2018449)Open Research Project of Chinese Academy of Sciences,National Natural Science Foundation of China(U1732137,U1832122,U1738205)。
文摘The Rare-Isotope Beam(RIB)Physics Laboratory at IMP has made steady progress in 2022 in the following five aspects.1.Nuclear structure and reaction studies with intermediate-and low-energy RI beams.Measurements of charge-changing cross-sections(CCCS)of^(30-36)P on a^(nat)C target were successfully performed at beam energies around 200-300 MeV/nucleon at the External Target Facility(ETF)of HIRFL to investigate the effect of the N=20 shell closure.
