Comment on “Integrable Chain of Electrons Interacting With Phonons,” By M. E. Zhuravlev,V. A. Ivanov,and V. V. Achkasov,JETP Lett. 63, 94 (1996)

We note that the exactly solvable electron-phonon Hamiltonian presented in that paper can be solved by a more direct route via the Lang-Firsov transformation. Pis’ma Zh. éksp. Teor. Fiz. 64, No. 12, 859–860 (25 December 1996) Published in English in the original Russian Journal. Edited by Steve Torstveit.     

Comment on ``Application of the (G'/G)-Expansion Method for Nonlinear Evolution Equations' [Phys. Lett. A 372 (2008) 3400]

In this paper, some travelling wave solutions involving parameters of the Modified Zakharov-Kuznetsov equation [Phys. Lett. A 372 (2008) 3400] are investigated. We will how that these solutions are not new travelling wave solutions.     

Erratum: Does the Unruh effect exist? [JETP Lett. 65, No. 12, 902–908 (25 June 1997)]

On page 905, the second sentence after Eq. (18) should read: “If here the surface t=0 is taken as the surface of integration and the fact that the modes R _μ=0 for z<0 and are functionally the same as the Fulling modes (3) for z>0 is taken into account, then after making the change of variables (8) it might seem that (R _μ,φ)_M=(Φ_μ, φ)R.”     

The 46Ti(p, γ)47V, 50Cr(p, γ)51Mn, 58Ni(α, γ)62Zn and58Ni(α, p)61Cu cross sections

The ${}^{46}\text{Ti}\text{(}\text{p}\text{, γ)}{}^{47}\text{V}\text{,}{}^{50}\text{Cr}\text{(}\text{p}\text{, γ)}{}^{51}\text{Mn}\text{,}{}^{58}\text{Ni}\text{(α,γ)}{}^{62}\text{Zn and}{}^{58}\text{Ni}\text{(α, p)}{}^{61}\text{Cu}$ cross sections have been measured in the energy range of interest for stellar nucleosynthesis during oxygen and silicon burning. The results are compared with statistical theory calculations which attempt to treat excited state effects and the γ-ray channel more realistically than previous calculations.     

Search for M1 strength in 51V and the difference in 51V(e,e′) and 51V(p,p′) spectra

Following the studies of the distribution of M1 strength in the even-even N = 28 isotones ⁴⁸Ca, ⁵⁰Ti, ⁵²Cr and ⁵⁴Fe by inelastic electron scattering, the result of a search for M1 transitions in the odd-even N = 28 nucleus ⁵¹V is reported. No strong M1 excitation has been detected, in contrast to a recent (p, p') experiment. There is no immediate explanation for this discrepancy. Shell-model calculations indicate that a part of it might be accounted for by an interference between the spin and orbital term of the electromagnetic transition operator in the (e, e') experiment.     

A study of the Li(p,n)Be reaction by the neutron threshold technique

The reaction ⁶Li(p,n)⁶Be has been studied by slow-neutron detection, with particular attention to the ⁶Be ground state threshold. The detector response was calculated by a Monte Carlo technique and verified with a measurement of the ⁷Li(,n)¹⁰B threshold. An analysis of the shape of the ⁶Be threshold indicated that both s- and p-wave neutrons contribute significantly to the reaction. The results depend on what mode of decay is assumed for the ground state of ⁶Be. If a two-stage process is assumed, with either an alpha particle and an unbound diproton or ⁵Li and a proton as intermediate state, the width is found to be 95±28 keV and the Q-value obtained for the ⁶Li(p,n)⁶Be reaction is −5074±13 keV. It was not possible to detertmine which process is predominant. No higher thresholds in the slow neutron yield up to 4 MeV of excitation in ⁶Be were observed. The data above the ground state threshold are consistent with a broad excited state of ⁶Be or with the occurrence of other neutron-producing reactions.     

Comment on “Piezonuclear decay of thorium” [Phys. Lett. A 373 (2009) 1956]

Subjecting a solution of ²²⁸Th to ultrasound (20 kHz, 100 W), Cardone et al. [F. Cardone, R. Mignani, A. Petrucci, Phys. Lett. A 373 (2009) 1956] claim to observe an increase in the transformation or decay rate of ²²⁸Th by a factor of 10⁴. The evidence provided seems however far from conclusive and in part contradictory to the claims made. In fact, looking at the presented data we find it cannot be taken as justification to discard the null hypothesis, namely, that the data from exposed and non-exposed samples are drawn from the same distribution. We suggest a number of additional tests that should be made in order to improve the quality of the study and test the hypothesis of so-called piezonuclear reactions.