2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Cosmic ray spallation yog xav tias yog lub luag haujlwm rau kev nplua nuj nyob hauv lub ntiaj teb ntawm qee lub teeb-lithium, beryllium, thiab boron-zoo li cov isotope helium-3. … Boron tuaj yeem tsim ncaj qha. Cov beryllium thiab boron raug coj los nag los rau hauv av.
feem ntau ntawm cov boron thiab beryllium nyob rau hauv lub ntug tuaj qhov twg?
Ob lub ntsiab lus no, tsis yog coincidentally, kuj tau khi ua ke hauv lawv lub hauv paus, rau tag nrho cov beryllium thiab feem ntau boron yog tsim tob hauv qhov chaw los ntawm cosmic rays. Tsuas yog lithium thiab deuterium, ib qho isotope ntawm hydrogen, qhia qhov keeb kwm no.
cosmic rays muaj dab tsi?
Cosmic rays originate ua thawj cosmic rays, uas yog cov Ameslikas tsim nyob rau hauv ntau yam astrophysical txheej txheem. Thawj cosmic rays yog tsim los ntawm protons thiab alpha particles(99%), nrog me me ntawm hnyav dua nuclei (≈1%) thiab ib feem tsawg kawg nkaus ntawm positrons thiab antiprotons.
Lithium beryllium thiab boron ua li cas?
Boron thiab beryllium yog tsim los ntawm kev sib tsoo ntawm protons hauv cosmic rays nrog carbon atoms, thaum lithium tuaj yeem tsim los ntawm kev sib tsoo ntawm ntau tshaj helium atoms hauv cosmic rays nrog lwm yam helium nuclei. … Yog li boron thiab beryllium abundances muab qhia rau keeb kwm ntawm lub galaxy thiab tseeb ntawm lub ntug.
Cov khoom hnyav npaum li cas yog tsim thaum lub sijhawmnucleosynthesis?
Lub hnub qub tsim nyob rau hauv lub ntiaj teb thaum ntxov tsim cov ntsiab lus hnyav los ntawm kev sib xyaw nws cov nuclei sib zog - hydrogen, helium, lithium, beryllium, thiab boron - uas tau pom nyob rau hauv thawj qhov sib xyaw ntawm lub hnub qub nruab nrab thiab yog li lub hnub qub.
Pom zoo:
Ntawm lub cosmic inflation?
Nyob rau hauv lub cev cosmology, cosmic inflation, cosmological inflation, los yog inflation xwb, yog a txoj kev xav ntawm exponential expansion ntawm qhov chaw nyob rau hauv lub ntiaj teb thaum ntxov. … Qhov nrawm ntawm qhov nthuav dav no vim lub zog tsaus ntuj tau pib tom qab lub ntiaj teb twb dhau 7.
Vim li cas cosmic brownies?
Yog li dab tsi ua rau lawv "cosmic"? Kuj ceeb tias, lawv tau tau tshoov siab thiab muaj npe tom qab Cosmic Bowling sib txawv uas tau pib thaum xyoo 90s. Cov khoom qab zib ci ci coated sprinkles tawm tsam tsaus chocolate brownies yog kom zoo li lub ci neon sib txawv hauv cosmic bowling, zoo li qhov koj yuav pom hauv qab lub teeb dub.
Puas yog boron tribromide ua hluav taws xob?
Thaum kawg, boron tribromide (BBr3). BBr3 tsis ua hluav taws xob nyob rau hauv cov khoom tsis muaj molten, qhov no yog vim BBr3 muaj covalent bonding ntawm nruab nrab B atom thiab 3 ib puag ncig Br atoms. Puas muaj fluoride ua hluav taws xob?
Nyob hauv thawj cosmic rays uas muaj zog dua?
Cov txiaj ntsig ntawm kev txhais lus tau hais tias yog vim muaj cov khoom tsim positron hauv kev rhuav tshem cov xwm txheej ntawm cov teeb meem tsaus ntuj loj heev. Cosmic ray antiprotons kuj tseem muaj lub zog nruab nrab ntau dua li lawv cov khoom sib xws (protons).
Qhov twg yog cov tshuaj tiv thaiv spallation?
Cov kev cuam tshuam spallation yog hom tshuaj tiv thaiv nuclear uas tshwm sim hauv qhov chaw los ntawm kev cuam tshuam ntawm cosmic rays nrog lub cev interstellar. Thawj qhov kev tshwm sim tshwm sim tshwm sim nrog lub accelerator tshwm sim xyoo 1947 ntawm Berkeley cyclotron (University of California) nrog 200 MeV deuterons thiab 400 MeV alpha beams.
