Nuclear physics. B, Proceedings, supplements最新文献_第3页

Neutrino signatures of the origins of cosmic rays 宇宙射线起源的中微子特征

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.031

Karl Mannheim

{"title":"Neutrino signatures of the origins of cosmic rays","authors":"Karl Mannheim","doi":"10.1016/j.nuclphysbps.2014.10.031","DOIUrl":"10.1016/j.nuclphysbps.2014.10.031","url":null,"abstract":"<div><p>The intensity of extraterrestrial neutrinos discovered by IceCube [M. G. Aartsen et al. (IceCube Collaboration), Science <strong>342</strong> (2013) 1242856] is in reasonable agreement with predictions of neutrinos from the jets of active galactic nuclei due to pion production by accelerated protons [K. Mannheim, Astropart. Phys. 3 (1995) 295]. The observed deficit of Glashow-resonance events at 6.3 PeV could result from the suppression of events with energies larger than PeV due to the presence of a strong “big blue bump” radiation field in flat-spectrum radio quasars. The total neutrino spectrum could exhibit a two-component structure in which the sub-PeV component is dominated by the jets from AGN with high accretion rates and another component peaking at EeV energies due to those with low accretion rates. Each component of the neutrino spectrum should carry the energy flux that corresponds to its relative contribution to the extragalactic gamma ray background. The arrival directions should correlate with known sources, and a simple test shows that the PeV events can indeed be explained by known blazars with prominent radio jets. If a Galactic component of cosmic rays with energies per nucleon above knee energies exists, as air shower array data seem to indicate, the neutrinos due to pion production from these sources are also detectable, pinpointing them an energies where gamma-ray observations are not yet possible.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 264-266"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110853771","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}

引用次数: 4

Non-thermal processes in non-standard accelerators: protostellar jets and runaway stars 非标准加速器中的非热过程:原恒星喷流和逃逸恒星

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.014

Anabella T. Araudo , M. Victoria del Valle

引用次数: 3

Direct detection of cosmic rays: through a new era of precision measurements of particle fluxes 直接探测宇宙射线:通过粒子通量精确测量的新时代

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.019

E. Mocchiutti

引用次数: 7

Gamma-rays, neutrinos and cosmic rays from dense regions in open clusters 伽马射线，中微子和宇宙射线来自疏散星团的密集区域

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.013

W. Bednarek, J. Pabich, T. Sobczak

引用次数: 3

Recent developments in cosmic ray physics 宇宙射线物理学的最新进展

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.004

P. Blasi

{"title":"Recent developments in cosmic ray physics","authors":"P. Blasi","doi":"10.1016/j.nuclphysbps.2014.10.004","DOIUrl":"10.1016/j.nuclphysbps.2014.10.004","url":null,"abstract":"<div><p>The search for a theory of the origin of cosmic rays that may be considered as a standard, agreeable model is still ongoing. On one hand, much circumstantial evidence exists of the fact that supernovae in our Galaxy play a crucial role in producing the bulk of cosmic rays observed on Earth. On the other hand, important questions about their ability to accelerate particles up to the knee remain unanswered. The common interpretation of the knee as a feature coinciding with the maximum energy of the light component of cosmic rays and a transition to a gradually heavier mass composition is mainly based on KASCADE results. Some recent data appear to question this finding: YAC1 – Tibet Array and ARGO-YBJ find a flux reduction in the light component at ∼ 700 TeV, appreciably below the knee. Whether the maximum energy of light nuclei is as high as 3000 TeV or rather as low as a few hundred TeV has very important consequences on the supernova remnant paradigm for the origin of cosmic rays, as well on the crucial issue of the transition from Galactic to extragalactic cosmic rays. In such a complex phenomenological situation, it is important to have a clear picture of what is really known and what is not. Here I will discuss some solid and less solid aspects of the theory (or theories) for the origin of cosmic rays and the implications for future searches in this field.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 36-47"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76267118","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}

引用次数: 5

Using optical lines to study particle acceleration at supernova remnants 利用光谱线研究超新星残骸中的粒子加速

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.006

Giovanni Morlino

{"title":"Using optical lines to study particle acceleration at supernova remnants","authors":"Giovanni Morlino","doi":"10.1016/j.nuclphysbps.2014.10.006","DOIUrl":"10.1016/j.nuclphysbps.2014.10.006","url":null,"abstract":"<div><p>The shocks of several young supernova remnants (SNR) are often associated with very thin optical filaments dominated by Balmer emission resulting from charge-exchange and collisional excitation between neutral Hydrogen from the interstellar medium and shocked protons and electrons. Optical lines are a direct probe of the conditions at the shock, in particular the width of the narrow and broad components reflect the temperature upstream and downstream of the shock, respectively. When the shock accelerate efficiently non-thermal particles, the shock structure changes producing anomalous Balmer lines and it is possible to use their line shape and their spatial profile to check the efficiency of SNR shocks in accelerating cosmic rays. Here we illustrate the kinetic theory of shock acceleration in presence of neutrals with some applications to young SNRs. We show that in three cases (RCW 86, SNR 0509-67.5 and Tycho) anomalous Balmer lines can be explained assuming that a fraction of ∼ 10% of the total shock kinetic energy is converted into not thermal particles, while in one single case, the northwestern part of SN 1006, there is no evidence of efficient acceleration.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 56-64"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75151781","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}

引用次数: 4

CRBTSM 2014. Cosmic Ray Origin – Beyond the Standard Models CRBTSM 2014:宇宙射线起源-超越标准模型:圣维托迪卡多尔(BL)，意大利，2014年3月16日至22日

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/S0920-5632(14)00286-2

引用次数: 0

Pulsars: a promising source for high and ultrahigh energy cosmic rays 脉冲星:高能和超高能宇宙射线的有希望的来源

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.016

Kumiko Kotera

引用次数: 4

Cosmic ray acceleration search in Supernova Remnants 超新星残骸中的宇宙射线加速搜索

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/j.nuclphysbps.2014.10.009

Francesco Giordano , Leonardo Di Venere , Fermi-LAT collaboration

引用次数: 1

Scientific Program 科学的计划

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-11-01 DOI: 10.1016/S0920-5632(14)00312-0

引用次数: 0