According to experimental data at GSI, the rates of the number of daughter ions, produced by the nuclear K-shell electron capture (EC) decays of the H-like 140Pr58+, 142Pm60+ and 122I52+ ions, are modulated in time with periods T_{EC} of the order of a few seconds, obeying an A-scaling T_{EC} = A/20 s, where A is the mass number of the mother nuclei, and with amplitudes a^{EC}_d ~ 0.21. In turn, the positron decay mode of the H-like 142Pm60+ ions showed no time modulation of the decay rates. As has been shown in Phys. Rev. Lett. 103, 062502 (2009) and Phys. Rev. Lett. 101, 182501 (2008), these data can be explained by the interference of two neutrino mass-eigenstates. In this letter we give a reply on the comments on our paper Phys. Rev. Lett. 103, 062502 (2009) by V. Flambaum (arXiv: 0908.2039 [nucl-th]).
Neutrino magnetic moment effects in electron-capture measurements at GSI
我猜想,GSI的类氢重离子两体电子俘获衰变的单离子测量中所报道的时间调制衰变率可能与储存环静态磁场中的中微子自旋进动有关。这些“GSI振荡”产生于磁场内外衰变幅度之间的干扰,这种情况需要狄拉克中微子的磁矩比Borexino太阳中微子上限0.54 x 10 E(-10)玻尔磁子低六倍。我还以一种以前没有讨论过的方式表明,与大质量中微子振幅之间的干扰有关的时间调制,如果这种干扰可能出现的话,其周期至少比报道的短四个数量级,并且在给定GSI测量的时间分辨率的情况下,平均值必须为零。
Neutrino signals in electron-capture decays of hydrogen-like parent ions P in storage-ring experiments at GSI are reconsidered, with special emphasis placed on the storage-ring quasi-circular motion of the daughter ions D in two-body decays P --> D + e-neutrino. It is argued that to the extent that daughter ions are detected, these detection rates might exhibit modulations with periods of order seconds, similar to those reported in the GSI storage-ring experiments for two-body decay rates [1,2]. New dedicated experiments in storage rings, or using traps, could explore these modulations.
Comments on "Rates of processes with coherent production of different particles and the GSI time anomaly"by C. Giunti, Phys. Lett. B 665, 92 (2008), 0805.0431
We investigate the emergence of oscillations in the decay law of unstable systems. We discuss in particular the case of the so-called GSI anomaly seen in the electron capture decays of H-like ions and prove that such oscillations cannot be explained by neutrino oscillations. We then discuss how such anomalies could be intimately related to the decay law of unstable systems in the case in which their spectral function deviates from a Breit-Wigner shape.
The physical principles that determine the effect of the electron shell of an atom on the alpha decay rate of the nucleus are presented. The effect is shown to be negative. Numerical calculations of the effect in helium-like ions are performed. It accounts for more than 80% of the effect in neutral atoms. The prospects for experimental detection of the effect in the storage rings of the GSI Darmstadt, ISF Lanzhou are discussed.
To assess the degree of equilibration of the matter created in heavy-ion reactions at low to intermediate beam energies, a hadronic transport approach (SMASH) is employed. By using a coarse-graining method, we compute the energy momentum tensor of the system at fixed time steps and evaluate the degree of isotropy of the diagonal terms and the relative magnitude of the off-diagonal terms. This study focuses mostly on Au+Au collisions in the energy range $\sqrt{s_{\rm NN}}$ = 2.4-7.7 GeV, but central collisions of lighter ions like C+C, Ar+KCl and Ag+Ag are considered as well. We find that the c…