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

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.

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

scholarly journals Microscopic description of the pygmy dipole resonance in neutron-rich Ca isotopes

2018 ◽  
Vol 194 ◽  
pp. 04002
Author(s):  
N.N. Arsenyev ◽  
A.P. Severyukhin ◽  
V.V. Voronov ◽  
N.V. Giai
Keyword(s):  
Electric Dipole ◽  
Random Phase Approximation ◽  
Strength Function ◽  
Random Phase ◽  
Strength Distribution ◽  
Low Energy ◽  
Dipole Strength ◽  
Quasiparticle Random Phase Approximation ◽  
Dipole Resonance ◽  
Dipole Response

We study the effects of the phonon-phonon coupling on the low-energy electric dipole response within a microscopic model based on an effective Skyrme interaction. The finite rank separable approach for the quasiparticle random phase approximation is used. Choosing as an example the isotopic chain of Calcium, we show the ability of the method to describe the low-energy E1 strength distribution. With one and the same set of parameters we describe available experimental data for 48Ca and predict the electric dipole strength function for 50Ca.

scholarly journals Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27

2018 ◽  
Vol 121 (26) ◽  
Author(s):  
C. Loelius ◽  
N. Kobayashi ◽  
H. Iwasaki ◽  
D. Bazin ◽  
J. Belarge ◽  
...  
Keyword(s):  
Electric Dipole ◽  
Bound States ◽  
Dipole Strength ◽  
Weakly Bound

Systematic calculation of electric dipole strength with Skyrme-HF plus RPA

2010 ◽  
Author(s):  
T. Inakura ◽  
T. Nakatsukasa ◽  
K. Yabana ◽  
Akira Ozawa ◽  
Weiping Lu
Keyword(s):  
Electric Dipole ◽  
Dipole Strength ◽  
Systematic Calculation

scholarly journals Concentration of electric dipole strength below the neutron separation energy in N=82 nuclei

2002 ◽  
Vol 542 (1-2) ◽  
pp. 43-48 ◽  
Author(s):  
A Zilges ◽  
S Volz ◽  
M Babilon ◽  
T Hartmann ◽  
P Mohr ◽  
...  
Keyword(s):  
Electric Dipole ◽  
Neutron Separation Energy ◽  
Separation Energy ◽  
Dipole Strength
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