scholarly journals Do the Geminga, Monogem and PSR J0622+3749 γ -ray halos imply slow diffusion around pulsars?

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
S. Recchia ◽  
M. Di Mauro ◽  
F. A. Aharonian ◽  
L. Orusa ◽  
F. Donato ◽  
...  
Keyword(s):  
Slow Diffusion ◽  
Γ Ray

scholarly journals Possible origin of the slow-diffusion region around Geminga

2019 ◽  
Vol 488 (3) ◽  
pp. 4074-4080 ◽  
Author(s):  
Kun Fang ◽  
Xiao-Jun Bi ◽  
Peng-Fei Yin
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Diffusion Region ◽  
Late Time ◽  
Slow Diffusion ◽  
Strong Turbulence ◽  
Streaming Instability ◽  
High Energy Electrons ◽  
Electrons And Positrons ◽  
Γ Ray

ABSTRACT Geminga pulsar is surrounded by a multiTeV γ-ray halo radiated by the high-energy electrons and positrons accelerated by the central pulsar wind nebula (PWN). The angular profile of the γ-ray emission reported by High-Altitude Water Cherenkov Observatory indicates an anomalously slow diffusion for the cosmic-ray electrons and positrons in the halo region around Geminga. In the paper we study the possible mechanism for the origin of the slow diffusion. At first, we consider the self-generated Alfvén waves due to the streaming instability of the electrons and positrons released by Geminga. However, even considering a very optimistic scenario for the wave growth, we find this mechanism does not work to account for the extremely slow diffusion at the present day, if taking the proper motion of Geminga pulsar into account. The reason is straightforward as the PWN is too weak to generate enough high-energy electrons and positrons to stimulate strong turbulence at the late time. We then propose an assumption that the strong turbulence is generated by the shock wave of the parent supernova remnant (SNR) of Geminga. Geminga may still be inside the SNR, and we find that the SNR can provide enough energy to generate the slow-diffusion circumstance. The TeV haloes around PSR B0656+14, Vela X, and PSR J1826-1334 may also be explained under this assumption.

Nuclear γ ray lines in the supernova SN 1987a

1991 ◽  
Vol 16 (4) ◽  
pp. 443-457
Author(s):  
R. Lehoucq ◽  
Ph. Durouchouxa
Keyword(s):  
Sn 1987A ◽  
Γ Ray

scholarly journals Total absorption γ -ray spectroscopy of niobium isomers

2019 ◽  
Vol 100 (2) ◽  
Author(s):  
V. Guadilla ◽  
A. Algora ◽  
J. L. Tain ◽  
J. Agramunt ◽  
J. Äystö ◽  
...  
Keyword(s):  
Total Absorption ◽  
Γ Ray

scholarly journals Independent normalization for γ -ray strength functions: The shape method

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
M. Wiedeking ◽  
M. Guttormsen ◽  
A. C. Larsen ◽  
F. Zeiser ◽  
A. Görgen ◽  
...  
Keyword(s):  
Γ Ray ◽  
Strength Functions

scholarly journals Experimental information on mass- and TKE-dependence of the prompt fission γ-ray multiplicity

2021 ◽  
pp. 136293
Author(s):  
M. Travar ◽  
V. Piau ◽  
A. Göök ◽  
O. Litaize ◽  
J. Nikolov ◽  
...  
Keyword(s):  
Experimental Information ◽  
Γ Ray ◽  
Prompt Fission

scholarly journals Harnack’s inequality for doubly nonlinear equations of slow diffusion type

2021 ◽  
Vol 60 (6) ◽  
Author(s):  
Verena Bögelein ◽  
Andreas Heran ◽  
Leah Schätzler ◽  
Thomas Singer
Keyword(s):  
Vector Field ◽  
Harnack Inequality ◽  
Parabolic Equations ◽  
Full Range ◽  
Nonlinear Parabolic Equations ◽  
Growth Conditions ◽  
Diffusion Type ◽  
Slow Diffusion ◽  
Nonlinear Parabolic ◽  
Doubly Nonlinear

AbstractIn this article we prove a Harnack inequality for non-negative weak solutions to doubly nonlinear parabolic equations of the form $$\begin{aligned} \partial _t u - {{\,\mathrm{div}\,}}{\mathbf {A}}(x,t,u,Du^m) = {{\,\mathrm{div}\,}}F, \end{aligned}$$ ∂ t u - div A ( x , t , u , D u m ) = div F , where the vector field $${\mathbf {A}}$$ A fulfills p-ellipticity and growth conditions. We treat the slow diffusion case in its full range, i.e. all exponents $$m > 0$$ m > 0 and $$p>1$$ p > 1 with $$m(p-1) > 1$$ m ( p - 1 ) > 1 are included in our considerations.

γ-Ray Initiated Reactions. II. The Addition of Silicon Hydrides to Alkenes1

1958 ◽  
Vol 80 (7) ◽  
pp. 1737-1739 ◽  
Author(s):  
A. M. El-Abbady ◽  
Leigh C. Anderson
Keyword(s):  
Silicon Hydrides ◽  
Γ Ray
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