New theoretical results concerning gamma-ray emission from classical novae

Hernanz, Margarita; Jose´, Jordi; Coc, Alain; Go´mez-Gomar, Jordi; Isern, Jordi
April 2000
AIP Conference Proceedings;2000, Vol. 510 Issue 1, p97
Academic Journal
New results concerning the synthesis of radioactive nuclei in classical nova explosions are presented, together with their influence on the gamma-ray emission from these objects and the prospects for the detectability with present and future instruments. The isotopes involved in gamma-ray emission from classical novae are [sup 13]N, [sup 18]F, [sup 7]Be, [sup 22]Na and [sup 26]Al. Both [sup 13]N and [sup 18]F are crucial for the short duration annihilation emission, at 511 keV and below, that is emitted during the first hours after the outburst, before the nova maximum in visual magnitude. New recent results concerning the nuclear reaction rates involved in [sup 18]F destruction have been incorporated into our hydrodynamic code, which models the nova explosion with a detailed follow up of the associated nucleosynthesis. As a result of the larger rates of [sup 18]F destruction through proton captures, this isotope is produced in smaller quantities (typically by a factor of 10), leading to smaller fluxes in the 30–511 keV range. Concerning the medium and long lived isotopes, the inclusion of the latest reaction rates available in the NeNa-MgAl cycles provides an enhanced [sup 22]Na production with respect to previous results, leading to a larger 1275 keV flux emitted through its decay. [sup 26]Al is practically unchanged. The implications of our new results for the observability of novae by CGRO and by the future INTEGRAL instruments are addressed. © 2000 American Institute of Physics.


Related Articles

  • Nucleosynthesis in Jet-induced Supernovae: Connection between Gamma-Ray Bursts and Extremely Metal-Poor Stars. Tominaga, Nozomu // AIP Conference Proceedings;10/16/2010, Vol. 1279 Issue 1, p254 

    Jet-induced supernovae (SNe) have been suggested to take place in gamma-ray bursts (GRBs) and highly-energetic SNe (hypernovae). I summarize hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population (Pop) III 40 M⊙ star. In particular, I present the...

  • Long gamma-ray burst as a production site of r-process elements. Nakamrua, Ko; Harikae, Seiji; Kajino, Toshitaka; Mathews, Grant J. // AIP Conference Proceedings;Nov2012, Vol. 1484 Issue 1, p301 

    We simulated the r-process nucleosynthesis in and around a high entropy jet from a long gamma-ray burst (GRB). Our simulation is based on the collapsar scenario for long GRBs and on relativistic magnetohydrodynamic simulations (Harikae et al. 2009, 2010) including ray-tracing neutrino transport,...

  • Nucleosynthetic constraints on gamma-ray bursts and supernovae. Tominaga, Nozomu // AIP Conference Proceedings;Nov2012, Vol. 1484 Issue 1, p169 

    Although the explosion mechanisms of Gamma-ray bursts (GRBs) and Supernovae (SNe) have been investigated theoretically for a long while, they have not been clarified yet and thus it is required to obtain information from the other point of view. In this presentation, I focus on constraints of...

  • Two-helium radiative capture process and the Be nucleus at settler energies. Sadeghi, H.; Pourimani, R.; Moghadasi, A. // Astrophysics & Space Science;Apr2014, Vol. 350 Issue 2, p707 

    Alpha radiative capture reactions offers the opportunity to study nuclear processes of astrophysical interest. Most of the existing data on these processes have been gained by means of gamma-ray spectroscopy, where the measurements are very difficult due to the low cross sections and the...

  • Experimental studies of reactions relevant for γ-process nucleosynthesis. Scholz, P.; Endres, J.; Hennig, A.; Mayer, J.; Netterdon, L.; Sauerwein, A.; Zilges, A. // AIP Conference Proceedings;2014, Vol. 1595, p261 

    We report on our recent experimental studies of reactions relevant for the g process nucleosynthesis. Applying the activation method using the Cologne Clover Counting Setup total cross sections of the reactions 168Yb(α,γ), 168Yb(α,n), and 187Re(α,n) could be obtained. Furthermore,...

  • Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-ray Burst Jets. Shibata, Sanshiro; Tominaga, Nozomu // AIP Conference Proceedings;9/22/2011, Vol. 1367 Issue 1, p241 

    Recent results from the Pierre Auger Observatory (PAO) suggest that ultra-high energy cosmic rays (UHECRs) involve heavy or intermediate mass nuclei. This indicates that a considerable fraction of heavy nuclei must exist in the accelerating sites. Here, we focus on relativistic jets in gamma-ray...

  • Soft gamma repeaters as relaxation systems. Palmer, David M. // AIP Conference Proceedings;2000, Vol. 526 Issue 1, p791 

    SGR bursts come from systems that accumulate a continuous energy input and release it as discrete bursts. This behavior is analogous to the tectonic systems that produce earthquakes. The fact that these systems can be detected by examining the relationship between burst times and fluences has...

  • Particle acceleration in the 6 November 1997 event as viewed from gamma rays and solar energetic particles. Yoshimori, M.; Suga, K.; Shiozawa, A.; Nakayama, S.; Takeda, H. // AIP Conference Proceedings;2000, Vol. 528 Issue 1, p189 

    An intense solar event was observed on 6 November 1997 with Yohkoh and solar energetic particle (SEP) satellites. The Yohkoh gamma-ray spectrum and soft / hard X-ray images exhibit a characteristic of an impulsive event, while the SEP energy spectra, elemental abundances and charge states...

  • Use of n-capture γ-rays for studies in surface and solid state physics. Moreh, R.; Finkelstein, Y.; Shahal, O. // AIP Conference Proceedings;2000, Vol. 529 Issue 1, p408 

    A review of recent studies using the nuclear resonance photon scattering (NRPS) from [sup 15]N occurring in several gases is presented. In particular, new results on the adsorption and molecular orientation of N[sub 2], N[sub 2]O and NO[sub 2] on graphite are given and compared with theoretical...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics