2013 ◽  
Vol T152 ◽  
pp. 014011 ◽  
Author(s):  
Karlheinz Langanke ◽  
Hendrik Schatz

Author(s):  
F. Frontera ◽  
E. Virgilli ◽  
C. Guidorzi ◽  
P. Rosati ◽  
R. Diehl ◽  
...  

AbstractNuclear astrophysics, and particularly nuclear emission line diagnostics from a variety of cosmic sites, has remained one of the least developed fields in experimental astronomy, despite its central role in addressing a number of outstanding questions in modern astrophysics. Radioactive isotopes are co-produced with stable isotopes in the fusion reactions of nucleosynthesis in supernova explosions and other violent events, such as neutron star mergers. The origin of the 511 keV positron annihilation line observed in the direction of the Galactic Center is a 50-year-long mystery. In fact, we still do not understand whether its diffuse large-scale emission is entirely due to a population of discrete sources, which are unresolved with current poor angular resolution instruments at these energies, or whether dark matter annihilation could contribute to it. From the results obtained in the pioneering decades of this experimentally-challenging window, it has become clear that some of the most pressing issues in high-energy astrophysics and astro-particle physics would greatly benefit from significant progress in the observational capabilities in the keV-to-MeV energy band. Current instrumentation is in fact not sensitive enough to detect radioactive and annihilation lines from a wide variety of phenomena in our and nearby galaxies, let alone study the spatial distribution of their emission. In this White Paper (WP), we discuss how unprecedented studies in this field will become possible with a new low-energy gamma-ray space experiment, called ASTENA (Advanced Surveyor of Transient Events and Nuclear Astrophysics), which combines new imaging, spectroscopic and polarization capabilities. In a separate WP (Guidorzi et al. 39), we discuss how the same mission concept will enable new groundbreaking studies of the physics of Gamma–Ray Bursts and other high-energy transient phenomena over the next decades.


2012 ◽  
Vol 54 (5-6) ◽  
pp. 745-753 ◽  
Author(s):  
A. Tumino ◽  
C. Spitaleri ◽  
S. Cherubini ◽  
M. Gulino ◽  
M. La Cognata ◽  
...  

2017 ◽  
Vol 24 (4) ◽  
pp. 041407 ◽  
Author(s):  
M. Gatu Johnson ◽  
A. B. Zylstra ◽  
A. Bacher ◽  
C. R. Brune ◽  
D. T. Casey ◽  
...  

Author(s):  
B. DiGiovine ◽  
D. Henderson ◽  
R.J. Holt ◽  
R. Raut ◽  
K.E. Rehm ◽  
...  

2014 ◽  
Author(s):  
R. G. Pizzone ◽  
C. Spitaleri ◽  
C. A. Bertulani ◽  
A. M. Mukhamedzhanov ◽  
L. D. Blokhintsev ◽  
...  

2012 ◽  
Vol 27 (08) ◽  
pp. 1230008
Author(s):  
E. COCCIA

Underground laboratories, shielded by the Earth's crust from the particles that rain down on the surface in the form of cosmic rays, provide the low radioactive background environment necessary to host key experiments in the field of particle and astroparticle physics, nuclear astrophysics and other disciplines that can profit of their characteristics and of their infrastructures. The cosmic silence condition existing in these laboratories allows the search for extremely rare phenomena and the exploration of the highest energy scales that cannot be reached with accelerators. Major fundamental challenges are within the scope of these laboratories, notably, understanding the properties of neutrinos and dark matter, and exploring the unification of the fundamental forces of nature. I will review the physics reach and briefly describe the main underground facilities that are presently in operation around the world.


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