The origin of ultra-high energy cosmic rays is unknown and the mass composition is one of the key observables to understand the origin. The mass composition is estimated by comparing a prediction of the depth of maximum of shower developments, $X_{max}$, with experimental data, however, the $X_{max}$ prediction depends on the choice of hadronic interaction modes in the simulation. One of the proposed sources of the difference is the different modeling of diffractive collisions among the models. In this work, we estimate the effect of detail of diffractive collisions at the first interaction of cosmic-rays with atmospheric nuclei on the air shower developments by using the air shower simulation package COSMOS 8.035. The results show that the modeling of diffractive collisions at the first interaction is not the main source of the model discrepancies of the $X_{max}$ prediction.
{"title":"MC study for the effect of diffractive events on air shower developments","authors":"K. Ohashi, H. Menjo, Y. Itow","doi":"10.22323/1.356.0026","DOIUrl":"https://doi.org/10.22323/1.356.0026","url":null,"abstract":"The origin of ultra-high energy cosmic rays is unknown and the mass composition is one of the key observables to understand the origin. The mass composition is estimated by comparing a prediction of the depth of maximum of shower developments, $X_{max}$, with experimental data, however, the $X_{max}$ prediction depends on the choice of hadronic interaction modes in the simulation. One of the proposed sources of the difference is the different modeling of diffractive collisions among the models. In this work, we estimate the effect of detail of diffractive collisions at the first interaction of cosmic-rays with atmospheric nuclei on the air shower developments by using the air shower simulation package COSMOS 8.035. The results show that the modeling of diffractive collisions at the first interaction is not the main source of the model discrepancies of the $X_{max}$ prediction.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131758868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Currently, Super-K experiment uses Geant3 based simulation software (SKDETSIM), and the new phase of the experiment, which is called "SK-Gd Project" will start soon. Main purpose of the SK-Gd is the first discovery of the Diffuse Supernova Neutrino Background, which is neutrinos generated from the past Supernova explosion. In SK-Gd, precise understanding about neutron capture of Gadolinium is crucial. In order to apply the latest interaction model based on the new experimental results, Geant4 based Super-K simulation software "SKG4" is now on developing. In this article, The current development status of SKG4, and some results of comparison with SKDETSIM are presented.
{"title":"Development of Geant4 based simulation for Super-Kamiokande","authors":"M. Harada, Y. Koshio, K. Hagiwara","doi":"10.22323/1.356.0049","DOIUrl":"https://doi.org/10.22323/1.356.0049","url":null,"abstract":"Currently, Super-K experiment uses Geant3 based simulation software (SKDETSIM), and the new phase of the experiment, which is called \"SK-Gd Project\" will start soon. Main purpose of the SK-Gd is the first discovery of the Diffuse Supernova Neutrino Background, which is neutrinos generated from the past Supernova explosion. In SK-Gd, precise understanding about neutron capture of Gadolinium is crucial. In order to apply the latest interaction model based on the new experimental results, Geant4 based Super-K simulation software \"SKG4\" is now on developing. In this article, The current development status of SKG4, and some results of comparison with SKDETSIM are presented.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133745203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tomoki Yamamoto, H. Shimizu, K. Ishizaki, Y. Niinomi, M. Kitaguchi, S. Takada, J. Koga, S. Makise, T. Yoshioka, A. Kimura, K. Sakai, T. Oku, T. Okudaira, S. Endo, Y. Tani, H. Fujioka, H. Yoshikawa, K. Hirota, T. Shima
{"title":"Verification of the compound nuclear model for T-violation search","authors":"Tomoki Yamamoto, H. Shimizu, K. Ishizaki, Y. Niinomi, M. Kitaguchi, S. Takada, J. Koga, S. Makise, T. Yoshioka, A. Kimura, K. Sakai, T. Oku, T. Okudaira, S. Endo, Y. Tani, H. Fujioka, H. Yoshikawa, K. Hirota, T. Shima","doi":"10.22323/1.356.0042","DOIUrl":"https://doi.org/10.22323/1.356.0042","url":null,"abstract":"","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122829991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper addresses the status of major open questions in physics: CP violation in the leptonic sector and baryon decays. CP violation has not been measured in the leptonic sector yet and current long baseline neutrino experiment as T2K and NOνA are pursuing it whilst future experiments as DUNE and Hyper-Kamiokande will be able to give a definitive answer. An overview of the current status and future sensitivites is presented. Neutrino experiments can also be used to search for baryon decays, predicted by Grand Unification Theories, for which we present an overview of the current limits and future sensitivities.
{"title":"Status and Prospect of Neutrino CP Violation and Baryon Number Violation","authors":"F. Lodovico","doi":"10.22323/1.356.0022","DOIUrl":"https://doi.org/10.22323/1.356.0022","url":null,"abstract":"This paper addresses the status of major open questions in physics: CP violation in the leptonic sector and baryon decays. CP violation has not been measured in the leptonic sector yet and current long baseline neutrino experiment as T2K and NOνA are pursuing it whilst future experiments as DUNE and Hyper-Kamiokande will be able to give a definitive answer. An overview of the current status and future sensitivites is presented. Neutrino experiments can also be used to search for baryon decays, predicted by Grand Unification Theories, for which we present an overview of the current limits and future sensitivities.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133694763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The observation of cosmic gamma-rays is crucial to understanding high-energy astrophysical phe- nomena. The Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE) aims to precisely ob- serve gamma-ray sources with a balloon-borne gamma-ray telescope utilizing nuclear emulsion, which is a three-dimensional tracking detector with a sub-micron spatial resolution. We launched the third balloon experiment, GRAINE 2018, on April 26, 2018 as a demonstration project. The flight was successful, data acquisition was completed, and we are analyzing the data now. We evaluated the angular resolution for gamma-rays in the 100-300 MeV energy region of the con- verter’s flight data, and it is 0.57◦ (tanθ ≃zenith angle<0.5), 0.81◦ (0.5
{"title":"GRAINE 2018 experiment: Performance evaluation of gamma-ray telescope utilizing nuclear emulsion","authors":"Yuya Nakamura","doi":"10.22323/1.356.0039","DOIUrl":"https://doi.org/10.22323/1.356.0039","url":null,"abstract":"The observation of cosmic gamma-rays is crucial to understanding high-energy astrophysical phe- nomena. The Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE) aims to precisely ob- serve gamma-ray sources with a balloon-borne gamma-ray telescope utilizing nuclear emulsion, which is a three-dimensional tracking detector with a sub-micron spatial resolution. We launched the third balloon experiment, GRAINE 2018, on April 26, 2018 as a demonstration project. The flight was successful, data acquisition was completed, and we are analyzing the data now. We evaluated the angular resolution for gamma-rays in the 100-300 MeV energy region of the con- verter’s flight data, and it is 0.57◦ (tanθ ≃zenith angle<0.5), 0.81◦ (0.5<tanθ <1.0). This is better than the required performance value, which is 1.0◦ in 100- MeV energy region.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133580644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Test of the R(D(*)) anomaly at the LHC","authors":"Syuhei Iguro","doi":"10.22323/1.356.0027","DOIUrl":"https://doi.org/10.22323/1.356.0027","url":null,"abstract":"","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130410494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gravitational waves were detected in 2015 for the first time in the history of humankind. Since then, around ten gravitational wave signals coming from black hole/neutron star binary coalescences have been detected. Among various expected gravitational wave sources, the beginning of the universe is one of the most exciting targets. The inflation theory was developed to solve various problems of the big bang model such as the horizon problem. According to the inflation theory, the primordial gravitational waves produced during the inflation period could reach us. Deci-hertz Interferometer Gravitational Wave Observatory DECIGO), is the future Japanese mission, which aims at detecting the primordial gravitation waves between 0.1 Hz and 10 Hz as well as obtaining other important sciences. DECIGO has a 1,000-km arm length and Fabry-Perot cavities implemented to improve the sensitivity. DECIGO employs drag-free spacecraft in a heliocentric earth-trail orbit. We plan to launch B-DECIGO first to demonstrate technologies necessary for DECIGO, as well as to detect a variety of gravitational waves. Then we plan to launch DECIGO to detect the primordial gravitational waves.
{"title":"Primordial gravitational wave and DECIGO","authors":"S. Kawamura","doi":"10.22323/1.356.0019","DOIUrl":"https://doi.org/10.22323/1.356.0019","url":null,"abstract":"Gravitational waves were detected in 2015 for the first time in the history of humankind. Since then, around ten gravitational wave signals coming from black hole/neutron star binary coalescences have been detected. Among various expected gravitational wave sources, the beginning of the universe is one of the most exciting targets. The inflation theory was developed to solve various problems of the big bang model such as the horizon problem. According to the inflation theory, the primordial gravitational waves produced during the inflation period could reach us. Deci-hertz Interferometer Gravitational Wave Observatory DECIGO), is the future Japanese mission, which aims at detecting the primordial gravitation waves between 0.1 Hz and 10 Hz as well as obtaining other important sciences. DECIGO has a 1,000-km arm length and Fabry-Perot cavities implemented to improve the sensitivity. DECIGO employs drag-free spacecraft in a heliocentric earth-trail orbit. We plan to launch B-DECIGO first to demonstrate technologies necessary for DECIGO, as well as to detect a variety of gravitational waves. Then we plan to launch DECIGO to detect the primordial gravitational waves.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114573656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Neutrino neutral-current elastic interaction by atmospheric neutrinos is one of the main background in Supernova relic neutrino (SRN) search at Super-Kamiokande with Gadolinium. Understanding of gamma-ray production via neutron interaction on oxygen is important for the study of neutrino neutral-current elastic interactions. A measurement of gamma-rays production from such reactions was performed by using a 30 MeV quasi-mono energetic neutron beam in the Research Center for Nuclear Physics, Osaka University. In this proceedings the current status and future prospects of this mesurement are presented.
{"title":"Measurement of gamma-rays from neutron-oxygen reaction for neutrino-nucleus interaction","authors":"T. Horai","doi":"10.22323/1.356.0050","DOIUrl":"https://doi.org/10.22323/1.356.0050","url":null,"abstract":"Neutrino neutral-current elastic interaction by atmospheric neutrinos is one of the main background in Supernova relic neutrino (SRN) search at Super-Kamiokande with Gadolinium. Understanding of gamma-ray production via neutron interaction on oxygen is important for the study of neutrino neutral-current elastic interactions. A measurement of gamma-rays production from such reactions was performed by using a 30 MeV quasi-mono energetic neutron beam in the Research Center for Nuclear Physics, Osaka University. In this proceedings the current status and future prospects of this mesurement are presented.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"326 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116226442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider the possibility of neutrino tomography by using the neutrino pair beam. The idea of neutrino tomography is imaging of the Earth’s interior structure by neutrino experiments. We assume the neutrino pair beam which has been recently proposed as an attractive neutrino source. The beam produces a huge amount of neutrino and antineutrino pairs from the circulating partially stripped ions. The beam enables us to measure the energy spectrum of the neutrino oscillation probability precisely together with a large detector. The neutrino pair beam can give a better sensitivity for probing the Earth’s crust compared to current neutrino sources. Furthermore, we propose a method to reconstruct the density profile by the analytic formula of the oscillation probability that incorporates the matter effect up to the second order of perturbation.
{"title":"Tomography by neutrino pair beam","authors":"Hisashi Okui","doi":"10.22323/1.356.0031","DOIUrl":"https://doi.org/10.22323/1.356.0031","url":null,"abstract":"We consider the possibility of neutrino tomography by using the neutrino pair beam. The idea of neutrino tomography is imaging of the Earth’s interior structure by neutrino experiments. We assume the neutrino pair beam which has been recently proposed as an attractive neutrino source. The beam produces a huge amount of neutrino and antineutrino pairs from the circulating partially stripped ions. The beam enables us to measure the energy spectrum of the neutrino oscillation probability precisely together with a large detector. The neutrino pair beam can give a better sensitivity for probing the Earth’s crust compared to current neutrino sources. Furthermore, we propose a method to reconstruct the density profile by the analytic formula of the oscillation probability that incorporates the matter effect up to the second order of perturbation.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"445 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123625047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recent direct detectioon searches for dark matter give stringent bounds on the dark matter mass and couplings. One way to relax the constraint is to rely on pseudoscalar interactions with fermionic dark matter. We focus on the singlet-doublet dark matter model, which predicts the pseudoscalar interactions by CP violation in the dark sector. Due to the CP violation, electric dipole moments (EDMs) are predicted. We show that the model can be tested by the combination of the direct detection experiments and the measurement of the electron EDM.
{"title":"Current status of the singlet-doublet dark matter model","authors":"T. Abe, R. Sato","doi":"10.22323/1.356.0032","DOIUrl":"https://doi.org/10.22323/1.356.0032","url":null,"abstract":"Recent direct detectioon searches for dark matter give stringent bounds on the dark matter mass and couplings. One way to relax the constraint is to rely on pseudoscalar interactions with fermionic dark matter. We focus on the singlet-doublet dark matter model, which predicts the pseudoscalar interactions by CP violation in the dark sector. Due to the CP violation, electric dipole moments (EDMs) are predicted. We show that the model can be tested by the combination of the direct detection experiments and the measurement of the electron EDM.","PeriodicalId":303007,"journal":{"name":"Proceedings of The 4th KMI International Symposium — PoS(KMI2019)","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125643081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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