Gamma-ray Line Astronomy

Diehl, R.

doi:10.1016/j.nuclphysa.2005.05.175

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…While atomic absorption lines are generally able to distinguish individual elements, isomeric transitions can be used to identify isotopes in a potential r-process site. Astronomical γ-ray observations (described in 5.3.1) present the possibility for isotopic identification of the r process occurring in real time [331].…”

Section: Isomersmentioning

confidence: 99%

Current Status of r-Process Nucleosynthesis

Kajino,

Aoki,

Balantekin

et al. 2019

Preprint

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The rapid neutron capture process (r-process) is believed to be responsible for about half of the production of the elements heavier than iron and contributes to abundances of some lighter nuclides as well. A universal pattern of r-process element abundances is observed in some metal-poor stars of the Galactic halo. This suggests that a well-regulated combination of astrophysical conditions and nuclear physics conspires to produce such a universal abundance pattern. The search for the astrophysical site for r-process nucleosynthesis has stimulated interdisciplinary research for more than six decades. There is currently much enthusiasm surrounding evidence for r-process nucleosynthesis in binary neutron star mergers in the multiwavelength follow-up observations of kilonova/gravitational-wave GRB170807A/GW170817. Nevertheless, there remain questions as to the contribution over the history of the Galaxy to the current solar-system r-process abundances from other sites such as neutrino-driven winds or magnetohydrodynamical ejection of material from core-collapse supernovae. In this review we highlight some current issues surrounding the nuclear physics input, astronomical observations, galactic chemical evolution, and theoretical simulations of r process astrophysical environments with goal of outlining a path toward resolving the remaining mysteries of the r-process.

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Section: Isomersmentioning

confidence: 99%

Current Status of r-Process Nucleosynthesis

Kajino,

Aoki,

Balantekin

et al. 2019

Preprint

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“…In this paper, we will discuss what has been learned from RHESSI and INTEGRAL with respect to nucleosynthesis sources in our Galaxy, after these experiments have been studied in detail with respect to their responses and backgrounds and can be considered mature. Initial results had been reported, a.o., at NIC XIII [10]; the sky exposure of INTEGRAL is shown in Figure 2.…”

Section: Gamma-ray Spectrometers In Spacementioning

confidence: 99%

Nuclear astrophysics with gamma-ray line observations

Diehl¹

2010

Proceedings of International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX — PoS(NIC-IX)

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Gamma-ray spectrometers with high spectral resolution have been operated in space since 2002. Major efforts to understand instrumental response and backgrounds are a requird before detailed science interpretations can be derived; by now, high-resolution line-shape studies have resulted in significant astrophysical constraints, not only through studies of solar-flare details, but also for nuclear processes in the Galaxy: 44 Ti from the Cas A supernova could only be detected in the low-energy lines at 68 and 78 keV, the 1157 keV line from the same decay is not seen; this constrains 44 Ti ejection in core collapse supernovae. Diffuse nucleosynthesis is studied through 26 Al, 60 Fe, and positron annihilation gamma-ray measurements. The gamma-ray line from decay of radioactive 26 Al could be measured at unpredecented spectroscopic precision. The new determination of the total mass of 26 Al produced by stellar sources throughout the Galaxy yields 2.8 ±0.9 M , and the interstellar medium around 26 Al sources appears characterized by velocities in the ~100 km s -1 region. 60 Fe is clearly detected with SPI, its intensity ratio to 26 Al of ~15% is on the lower side of predictions from massive-star and supernova nucleosynthesis models. Nucleosynthesis sources are probably minor contributors to Galactic positrons; this may be deduced from the bulge-centered spatial distribution of the annihilation gamma-ray emission, considering that nucleosynthesis sources are expected to populate mainly the disk part of the Galaxy. It is evident that new views at nuclear and astrophysical processes in and around cosmic sources are being provided through these space missions.

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Gamma-ray Astrophysics - Before GLAST

Carramiñana

Astrophysics and Space Science Proceedings

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Gamma-ray Line Astronomy

Cited by 8 publications

References 38 publications

Current Status of r-Process Nucleosynthesis

Current Status of r-Process Nucleosynthesis

Nuclear astrophysics with gamma-ray line observations

Gamma-ray Astrophysics - Before GLAST

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