{"id":771,"date":"2018-06-13T15:42:00","date_gmt":"2018-06-13T06:42:00","guid":{"rendered":"http:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/?p=771"},"modified":"2019-12-10T17:42:39","modified_gmt":"2019-12-10T08:42:39","slug":"in-orbit-background-odaka-en","status":"publish","type":"post","link":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/en\/2018\/06\/13\/in-orbit-background-odaka-en\/","title":{"rendered":"Radioactivation background in satellites&#8217; orbits"},"content":{"rendered":"<p>Our paper titled \u201cModeling of proton-induced radioactivation background in hard X-ray telescopes: Geant4-based simulation and its demonstration by Hitomi\u2019s measurement in a low Earth orbit\u201d has been published in Nuclear Instruments and Methods A.<br \/>\narXiv: <a href=\"https:\/\/arxiv.org\/abs\/1804.00827\">https:\/\/arxiv.org\/abs\/1804.00827<\/a><br \/>\nADS: <a href=\"http:\/\/adsabs.harvard.edu\/abs\/2018NIMPA.891...92O\">http:\/\/adsabs.harvard.edu\/abs\/2018NIMPA.891&#8230;92O<\/a><\/p>\n<p><a href=\"http:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wordpress\/wp-content\/uploads\/2018\/06\/Odaka18-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-442\" src=\"http:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wordpress\/wp-content\/uploads\/2018\/06\/Odaka18-1.png\" alt=\"\" width=\"360\" height=\"250\" srcset=\"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wordpress\/wp-content\/uploads\/2018\/06\/Odaka18-1.png 995w, https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wordpress\/wp-content\/uploads\/2018\/06\/Odaka18-1-300x209.png 300w, https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wordpress\/wp-content\/uploads\/2018\/06\/Odaka18-1-768x534.png 768w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/p>\n<p>Hard X-ray observation must be conducted in a satellite&#8217;s orbit due to atmospheric absorption, and therefore suffers from significant backgrounds induced by cosmic rays and\/or geomagnetically trapped charged particles. Hirokazu Odaka et al. have developed a new, effective, general-purpose framework of full Monte Carlo simulation of radioactivation background. We applied this framework to data measured with the Hard X-ray Imager onboard the Hitomi satellite, and obtained excellent agreement between the in-orbit background data and the simulation. The simulation technique newly developed in this work will be indispensable for designing future hard X-ray missions and for making their scientific plans. (This work was mainly done when H. Odaka was working at Stanford University.)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Our paper titled \u201cModeling of proton-induced radioactivation background in hard X-ray telescopes: Geant4-based simulation and its demonstration by Hitomi\u2019s measurement in a low Earth orbit\u201d has been published in Nuclear &#8230;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"437","footnotes":""},"categories":[6],"tags":[],"class_list":["post-771","post","type-post","status-publish","format-standard","hentry","category-paper","en-US"],"_links":{"self":[{"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/posts\/771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/comments?post=771"}],"version-history":[{"count":2,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/posts\/771\/revisions"}],"predecessor-version":[{"id":804,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/posts\/771\/revisions\/804"}],"wp:attachment":[{"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/media?parent=771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/categories?post=771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/energetic-universe.phys.s.u-tokyo.ac.jp\/wp-json\/wp\/v2\/tags?post=771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}