We study the Jahn-Teller effect of positive fullerene ions C60 and 1C 60 . The aim is to discover if this case, in analogy with the negative ion, possesses a Berry phase or not, and what are the consequences on dynamical Jahn-Teller quantization. Working in the linear and spherical approximation, we find no Berry phase in 1C 60 , and presence/absence of Berry phase for coupling of one L = 2 hol...

A hidden nonlinear bosonized supersymmetry was revealed recently in Pöschl-Teller and finite-gap Lamé systems. In spite of the intimate relationship between the two quantum models, the hidden supersymmetry in them displays essential differences. In particular, the kernel of the supercharges of the Pöschl-Teller system, unlike the case of Lamé equation, includes nonphysical states. By means of L...

New calculations are presented for Gamow-Teller beta decay of nuclei near 100 Sn. Essentially all of the 100 Sn Gamow-Teller decay strength is predicted to go to a single state at an excitation energy of 1.8 MeV in 100 In. The first calculations are presented for the decays of neighboring odd-even and odd-odd nuclei which show, in contrast to 100 Sn, surprisingly complex and broad Gamow-Teller ...

S. E. Canton, 2, ∗ A. J. Yencha, E. Kukk, J. D. Bozek, M. C. A. Lopes, G. Snell, and N. Berrah Department of Physics, Western Michigan University, Kalamazoo MI 49008 Lawrence Berkeley National Laboratory, ALS, University of California, Berkeley CA 94720 Department of Chemistry, State University of New-York at Albany, Albany, NY 12222 Department of Physical Sciences, Oulu University, Linnanmaa, ...

A simple model for electron-vibron interactions on charged buck-minsterfullerene C 60 n− , n = 1,. .. 5, is solved both at weak and strong couplings. We consider a single H g vibrational multiplet interacting with t 1u electrons. At strong coupling the semiclassical dynamical Jahn-Teller theory is valid. The Jahn-Teller distortions are unimodal for n=1,2,4,5 electrons, and bimodal for 3 electro...

Cs3C60 is an antiferromagnetic insulator that under pressure (P) becomes metallic and superconducting below Tc = 38 K. The superconducting dome present in the T - P phase diagram close to a magnetic state reminds what found in superconducting cuprates and pnictides, strongly suggesting that superconductivity is not of the conventional Bardeen-Cooper-Schrieffer (BCS) type We investigate the insu...

The relative distribution of the basins of attraction of the chemical species and of the transi­ tion states is derived for the thermal isomerization of cyclobutene to butadiene. It is shown that the transition states for the symmetry-allowed and symmetry-forbidden path­ ways are lumomers of one another. Use is made of the structural stability principle of Ariel Fernandez and Oktay Sinanoglu to...

The Gamow–Teller β decays of the neutron-deficient indium isotopes 104–107In have been investigated by using total absorption γ -ray spectrometry on mass-separated sources. The experimental Gamow–Teller strength, deduced as a function of the excitation energy in the daughter nuclei 104–107Cd, is compared to shell-model predictions.  2001 Elsevier Science B.V. All rights reserved.

The renormalization of the weak charge-changing hadronic current as a function of the reaction energy release is studied at the nucleonic level. We have calculated the average quenching factors for each type of current (vector, axial vector and induced pseudoscalar). The obtained quenching in the axial vector part is, at zero momentum transfer, 19% for the sd shell and 23% in the f p shell. We ...

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