X-ray bursts: Indirect measurement of the astrophysical 23Al(p,γ) reaction

Jun 5, 2018, 4:36 PM
Kunibiki Messe (Matsue)

Kunibiki Messe


Oral contribution Session 8


Dr Mohamad Moukaddam (University of Surrey)


X-ray bursts are the most frequent stellar explosions to occur throughout the cosmos and as such, represent key research environments for the field of nuclear astrophysics. These cataclysmic binary systems are known to exhibit distinctive light curves, which have now been observed with unprecedented sensitivity, that provide a detailed reflection of the underlying nuclear physics processes involved. Consequently, an accurate understanding of the observed light curves may hold the key to the unraveling of the burst mechanism, as well as the companion neutron star properties.

Recently, an in-depth study of the dependence of X-ray burst models on nuclear reaction rates has highlighted the 23Al(p,γ)24Si as being of particular significance in determining the shape of the X-ray burst light curve [1]. A direct investigation of this reaction is presently unfeasible due to the current low intensities of radioactive 23Al beams. As such, an innovative indirect approach is required.

In this talk, I will present the first ever study of the 23Ne(d,p)24Ne transfer reaction, which was recently performed at the ISAC-II facility at TRIUMF using a radioactive beam of 23Ne. Here, the high-granularity TIGRESS γ-ray array was used in conjunction with the SHARC silicon detection system to extract spectroscopic information on excited states in 24Ne. These states represent key isobaric analogs of resonances in 24Si and therefore, by measuring their spectroscopic strengths and employing mirror symmetry, it is possible to indirectly determine the 23Al(p,γ) stellar reaction rate. Such investigations have been extremely successful in recent years in constraining astrophysical reactions that lie outside the reach of direct measurements [2,3].

[1] R.H. Cyburt et al., Astrophys. J. 830, 55 (2016).
[2] V. Margerin, G. Lotay et al., Phys. Rev. Lett. 115, 062701 (2015).
[3] S.D. Pain et al., Phys. Rev. Lett. 114, 212501 (2015).

Primary authors

Dr Gavin Lotay (University of Surrey) Dr Mohamad Moukaddam (University of Surrey)


Dr Adam Garnsworthy (TRIUMF) Mr Ali Ihsan Kilic (Guelph) Ms Anita Mathews (Waterloo/TRIUMF) Mr Beau Greaves (Guelph) Mr Benjamin Luna (Tennesse Tech) Dr Bruno Olaizola (TRIUMF) Mr Calum Jones (University of Surrey/TRIUMF) Mr Daniel Levy (TRIUMF) Prof. Dennis Muecher (Guelph) Mr Devin Hymers (Guelph) Mr Donald Chaeny (Tennesse Tech) Ms Eva Kasanda (Guelph) Ms Farnaz Ghazi Moradi (Guelph) Mr Fuad Ali (Guelph, Canada / Sulaimani, Kurdistan, Iraq) Dr Greg Hackman (TRIUMF) Ms Hiral Patel (Waterloo/TRIUMF) Dr Jack Henderson (TRIUMF) Dr James Smallcombe (TRIUMF) Mr Jonah Berean (TRIUMF/UBC) Mr Kenneth Whitmore (TRIUMF/SFU) Ms Leyla Attar (Guelph) Mr Matthew Williams (TRIUMF/University of York) Dr Michael Bowry (TRIUMF) Mr Michael Spencer (Surrey/TRIUMF) Prof. Mustafa Rajabali (Tennesee Tech) Dr Nigel Orr (LPCCaen) Ms Nikita Bernier (TRIUMF) Dr Roger Caballero-Folch (TRIUMF) Mr Samuel Hallam (University of Surrey) Dr Soumendu Sekhar Bhattacharjee (TRIUMF) Dr Stephen Gillespie (TRIUMF) Prof. Tom Drake (Toronto) Prof. Wilton Catford (University of Surrey) Ms Yukiya Saito (TRIUMF/UBC)

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