Inelastic Scattering of Dark Matter with Heavy Cosmic Rays  

作　　者：Keyu Lu Yue-Lin Sming Tsai Qiang Yuan Le Zhang 

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China [2]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [3]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [4]CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area,SYSU,Zhuhai 519082,China [5]Peng Cheng Laboratory,Shenzhen 518000,China

出　　处：《Research in Astronomy and Astrophysics》2024年第6期68-80,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFF0503304,2020YFC2201600,2018YFA0404504 and 2018YFA0404601);the Ministry of Science and Technology of China(2020SKA0110402,2020SKA0110401 and 2020SKA0110100);the National Natural Science Foundation of China(11890691,12205388 and 12220101003);the CAS Project for Young Scientists in Basic Research(YSBR-061,YSBR-092);the China Manned Space Project with No.CMS-CSST-2021(A02,A03 and B01);the Major Key Project of PCL;the 111 project(B20019)。

摘　　要：We investigate the impact of inelastic collisions between dark matter(DM)and heavy cosmic ray(CR)nuclei on CR propagation.We approximate the fragmentation cross-sections for DM-CR collisions using collider-measured proton-nuclei scattering cross-sections,allowing us to assess how these collisions affect the spectra of CR boron and carbon.We derive new CR spectra from DM-CR collisions by incorporating their cross-sections into the source terms and solving the diffusion equation for the complete network of reactions involved in generating secondary species.In a specific example with a coupling strength of b_(χ)=0.1 and a DM mass of m_(χ)=0.1 GeV,considering a simplified scenario where DM interacts exclusively with oxygen,a notable modification in the boron-to-carbon spectrum due to the DM-CR interaction is observed.Particularly,the peak within the spectrum,spanning from 0.1 to 10 GeV,experiences an enhancement of approximately 1.5 times.However,in a more realistic scenario where DM particles interact with all CRs,this peak can be amplified to twice its original value.Utilizing the latest data from AMS-02 and DAMPE on the boron-to-carbon ratio,we estimate a 95%upper limit for the effective inelastic cross-section of DM-proton as a function of DM mass.Our findings reveal that at m_(χ)?2 MeV,the effective inelastic cross-section between DM and protons must be less than O(10^(-32))cm^(2).

关 键 词：elementary particles nuclear reactions NUCLEOSYNTHESIS ABUNDANCES SCATTERING astroparticle physics (cosmology:)dark matter 

分 类 号：P145.9[天文地球—天体物理] P172.4[天文地球—天文学]