Study of the Ti-44(alpha, p)V-47 reaction and implications for core collapse supernovae
Margerin, V., Murphy, A.St.J., Davinson, T., Dressler, R., Fallis, J., Kankainen, A., Laird, A.M., Lotay, G., Mountford, D.J., Murphy, C.D., Seiffert, C., Schumann, D., Stowasser, T., Stora, T., Wang, C.H.-T., & Woods, P.J. (2014). Study of the Ti-44(alpha, p)V-47 reaction and implications for core collapse supernovae. Physics Letters B, 731(April), 358-361. https://doi.org/10.1016/j.physletb.2014.03.003
Julkaistu sarjassa
Physics Letters BTekijät
Päivämäärä
2014Tekijänoikeudet
© 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
2016:35 | 2017:186 | 2018:330 | 2019:111 | 2020:71 | 2021:36 | 2022:27 | 2023:38 | 2024:47 | 2025:1
The underlying physics triggering core collapse supernovae is not fully understood but observations
of material ejected during such events helps to solve this puzzle. In particular, several satellite based
γ -ray observations of the isotope 44Ti have been reported recently. Conveniently, the amount of this
isotope in stellar ejecta is thought to depend critically on the explosion mechanism. The most influential
reaction to the amount of 44Ti in supernovae is 44Ti(α, p)47V. Here we report on a direct study of
this reaction conducted at the REX-ISOLDE facility, CERN. The experiment was performed with a 44Ti
beam at Elab = 2.16 MeV/u, corresponding to an energy distribution, for reacting α-particles, centred on
Ecm = 4.15 with a 1σ width of 0.23 MeV. This is, for the first time, well within the Gamow window for
core collapse supernovae. The material from which the 44Ti beam was extracted originates from highly
irradiated components of the SINQ spallation neutron source of the Paul Scherrer Institute. No yield
above background was observed, enabling an upper limit for the rate of this reaction to be determined.
This result is below expectation, suggesting that the 44Ti(α, p)47V reaction proceeds more slowly than
previously thought. Implications for astrophysical events, and remnant age, are discussed.
...
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Elsevier BV * North-HollandISSN Hae Julkaisufoorumista
0370-2693Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/23727324
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