Local electric dipole strength in heavy nuclei

1998 ◽  
Vol 57 (2) ◽  
pp. 990-993 ◽  
Author(s):  
A. M. Oros ◽  
K. Heyde ◽  
C. De Coster ◽  
B. Decroix
Keyword(s):  
Electric Dipole ◽  
Heavy Nuclei ◽  
Dipole Strength

The energy dependence of the electric dipole strength in heavy nuclei

2009 ◽  
Author(s):  
Eckart Grosse ◽  
Frantisek Bečvář ◽  
Arnd R. Junghans ◽  
Gencho Rusev ◽  
Ronald Schwengner ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Electric Dipole ◽  
Heavy Nuclei ◽  
Dipole Strength

scholarly journals The Energy Dependence of the Electric Dipole Strength in Heavy Nuclei

2011 ◽  
Vol 59 (2(3)) ◽  
pp. 1872-1875 ◽  
Author(s):  
A. R. Junghans ◽  
R. Beyer ◽  
G. Rusev ◽  
R. Schwengner ◽  
A. Wagner ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Electric Dipole ◽  
Heavy Nuclei ◽  
Dipole Strength

scholarly journals Fragmentation of electric dipole strength inN=82isotones

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
Mitsuru Tohyama ◽  
Takashi Nakatsukasa
Keyword(s):  
Electric Dipole ◽  
Dipole Strength

scholarly journals Description of dipole strength in heavy nuclei in conformity with their quadrupole degrees of freedom

2012 ◽  
Vol 21 ◽  
pp. 04003 ◽  
Author(s):  
E. Grosse ◽  
A.R. Junghans ◽  
R. Massarczyk ◽  
R. Schwengner ◽  
G. Schramm
Keyword(s):  
Degrees Of Freedom ◽  
Heavy Nuclei ◽  
Dipole Strength

scholarly journals Systematics of the electric dipole response in stable tin isotopes

2018 ◽  
Vol 178 ◽  
pp. 03008 ◽  
Author(s):  
Sergej Bassauer ◽  
Peter von Neumann-Cosel ◽  
Atsushi Tamii
Keyword(s):  
Electric Dipole ◽  
Strength Function ◽  
Research Centre ◽  
Underlying Structure ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Proton Scattering ◽  
Heavy Nuclei ◽  
Scattering Experiment ◽  
Dipole Response

The electric dipole is an important property of heavy nuclei. Precise information on the electric dipole response provides information on the electric dipole polarisability which in turn allows to extract important constraints on neutron-skin thickness in heavy nuclei and parameters of the symmetry energy. The tin isotope chain is particularly suited for a systematic study of the dependence of the electric dipole response on neutron excess as it provides a wide mass range of accessible isotopes with little change of the underlying structure. Recently an inelastic proton scattering experiment under forward angles including 0º on 112,116,124Sn was performed at the Research Centre for Nuclear Physics (RCNP), Japan with a focus on the low-energy dipole strength and the polarisability. First results are presented here. Using data from an earlier proton scattering experiment on 120Sn the gamma strength function and level density are determined for this nucleus.

Magnetoencephalographic accuracy profiles for the detection of auditory pathway sources

2015 ◽  
Vol 60 (2) ◽  
Author(s):  
Martin Bauer ◽  
Lutz Trahms ◽  
Tilmann Sander
Keyword(s):  
Brain Stem ◽  
Electric Dipole ◽  
Brain Research ◽  
Dipole Moments ◽  
Simulated Data ◽  
Auditory Pathway ◽  
Dipole Strength ◽  
Current Dipole ◽  
Limited Region ◽  
The Brain

AbstractThe detection limits for cortical and brain stem sources associated with the auditory pathway are examined in order to analyse brain responses at the limits of the audible frequency range. The results obtained from this study are also relevant to other issues of auditory brain research. A complementary approach consisting of recordings of magnetoencephalographic (MEG) data and simulations of magnetic field distributions is presented in this work. A biomagnetic phantom consisting of a spherical volume filled with a saline solution and four current dipoles is built. The magnetic fields outside of the phantom generated by the current dipoles are then measured for a range of applied electric dipole moments with a planar multichannel SQUID magnetometer device and a helmet MEG gradiometer device. The inclusion of a magnetometer system is expected to be more sensitive to brain stem sources compared with a gradiometer system. The same electrical and geometrical configuration is simulated in a forward calculation. From both the measured and the simulated data, the dipole positions are estimated using an inverse calculation. Results are obtained for the reconstruction accuracy as a function of applied electric dipole moment and depth of the current dipole. We found that both systems can localize cortical and subcortical sources at physiological dipole strength even for brain stem sources. Further, we found that a planar magnetometer system is more suitable if the position of the brain source can be restricted in a limited region of the brain. If this is not the case, a helmet-shaped sensor system offers more accurate source estimation.

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