Fast time variations of supernova neutrino fluxes and their detectability
Fast time variations of supernova neutrino fluxes and their detectability
复制标题
超新星中微子通量的快速时间变化及其可探测性
DOI：
10.1103/physrevd.82.063007
复制
发表时间：
2010
影响因子：
5
通讯作者：
G. Raffelt
中科院分区：
文献类型：
--
作者：
T. Lund;A. Marek;C. Lunardini;H. Janka;G. Raffelt
In the delayed explosion scenario of core-collapse supernovae, the accretion phase shows pronounced convective overturns and a low-multipole hydrodynamic instability, the standing accretion shock instability. These effects imprint detectable fast time variations on the emerging neutrino flux. Among existing detectors, IceCube is best suited to this task, providing an event rate of {approx}1000 ms{sup -1} during the accretion phase for a fiducial SN distance of 10 kpc, comparable to what could be achieved with a megaton water Cherenkov detector. If the standing accretion shock instability activity lasts for several hundred ms, a Fourier component with an amplitude of 1% of the average signal clearly sticks out from the shot noise. We analyze in detail the output of axially symmetric hydrodynamical simulations that predict much larger amplitudes up to frequencies of a few hundred Hz. If these models are roughly representative for realistic SNe, fast time variations of the neutrino signal are easily detectable in IceCube or future megaton-class instruments. We also discuss the information that could be deduced from such a measurement about the physics in the SN core and the explosion mechanism of the SN.
DOI：
10.1088/0004-637x/694/1/664
发表时间：
2007-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Marek;H. Janka
通讯作者：
A. Marek;H. Janka