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Al Falou, H. et al. (2013). Inelastic scattering of 9Li and excitation mechanism of its first excited state. Physics Letters B, AbstractThe first measurement of inelastic scattering of 9 Li from deuterons at the ISAC facility is reported. The measured angular distribution for the first excited state confirms the nature of excitation to be an E2 transition. The quadrupole deformation parameter is extracted from an analysis of the angular distribution.The neutron-rich nuclei close to the drip-line are subject of great interest due to the variance in their properties from our conventional knowledge of nuclear structure. The neutron halo in 11 Li [1] continues to be an intriguing quantum system whose complete understanding, from a microscopic view, is still an outstanding problem. It is important to understand how the two fragile halo neutrons are correlated and bound to the 9 Li core. It has been discussed that the bare nucleon-nucleon pairing interaction is not sufficient to bind the halo neutrons. The 9 Li core is suggested to play a more dynamic role in providing the glue to bind the halo neutrons through quadrupole vibrational phonon exchange [2].Knowledge on the properties of 9 Li is therefore important for a complete understanding of the structure of the neutron-rich lithium isotopes. The two-neutron transfer reaction from 11 Li, interestingly, observed some fraction of the 9 Li core in its first excited state [3]. The angular distribution of this reaction channel could be interpreted in the framework of nuclear field theory [4] using a wavefunction of 11 Li that contains a component with the 9 Li core in its first excited state. However, no experimental information exists on the nature of excitation of 9 Li to its first excited state.The neutron-rich p-shell nuclei also offer the scope of investigation using ab initio theories, which have significantly advanced in recent times. This makes it important to have experimental information on their structure and excitation mechanisms, that serve as testing grounds for the newly developed models.
Al Falou, H. et al. (2013). Inelastic scattering of 9Li and excitation mechanism of its first excited state. Physics Letters B, AbstractThe first measurement of inelastic scattering of 9 Li from deuterons at the ISAC facility is reported. The measured angular distribution for the first excited state confirms the nature of excitation to be an E2 transition. The quadrupole deformation parameter is extracted from an analysis of the angular distribution.The neutron-rich nuclei close to the drip-line are subject of great interest due to the variance in their properties from our conventional knowledge of nuclear structure. The neutron halo in 11 Li [1] continues to be an intriguing quantum system whose complete understanding, from a microscopic view, is still an outstanding problem. It is important to understand how the two fragile halo neutrons are correlated and bound to the 9 Li core. It has been discussed that the bare nucleon-nucleon pairing interaction is not sufficient to bind the halo neutrons. The 9 Li core is suggested to play a more dynamic role in providing the glue to bind the halo neutrons through quadrupole vibrational phonon exchange [2].Knowledge on the properties of 9 Li is therefore important for a complete understanding of the structure of the neutron-rich lithium isotopes. The two-neutron transfer reaction from 11 Li, interestingly, observed some fraction of the 9 Li core in its first excited state [3]. The angular distribution of this reaction channel could be interpreted in the framework of nuclear field theory [4] using a wavefunction of 11 Li that contains a component with the 9 Li core in its first excited state. However, no experimental information exists on the nature of excitation of 9 Li to its first excited state.The neutron-rich p-shell nuclei also offer the scope of investigation using ab initio theories, which have significantly advanced in recent times. This makes it important to have experimental information on their structure and excitation mechanisms, that serve as testing grounds for the newly developed models.
Model of ferromagnetic clusters in amorphous rare earth and transition metal alloysOn the local magnetic moments of transitionmetal Mössbauer impurities in ferromagnetic rare earths Conventional pulse-echo techniques and spin-phonon spectroscopy have been employed to examine magnetoelastic excitations in films of Fe, Ni, Gd, Er, and crystals of Gd. With perpendicular rf and dc fields, transverse magnetoelastic excitations are observed with intensities appropriate to a coupled mode model. Recent experiments on Er, with parallel rf and dc fields applied in the film plane, demonstrate the excitation of longitudinal phonons with signal intensities which increase monotonically with an applied field, varying from 0-24 kOe at 10K. Experiments on Gd, Ni, and Fe films with the same field configuration also yield longitudinal phonons at applied fields sufficiently large to magnetize the specimens. Experiments on Gd crystals give similar results. In all cases, the phonon signal is at the rf frequency and the signal intensity varies linearly with the rf field intensity. The data support the conclusion that a first order transition is responsible for the signals; however, with this so-called "parallelpumping" configuration of the rf and dc magnetic fields, first order transitions are forbidden. An addition to the conventional Hamiltonian, which may reconcile these difficulties, is discussed.
The anomalous transmission of the electromagnetic energy through thick ferromagnetic films has been discovered. The effect is observed when the static magnetic field is either parallel or perpendicular to the sample surface and perpendicular to the r.f. field. In order to explain the new effect, the spectrum and the attenuation of coupled sound-spin waves was calculated. The attenuation of the sound-like waves is rather small and thus sound waves can carry electromagnetic energy through the sample.
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