scholarly journals Information content of the low-energy electric dipole strength: Correlation analysis

2013 ◽  
Vol 87 (1) ◽  
Author(s):  
P.-G. Reinhard ◽  
W. Nazarewicz
Keyword(s):  
Correlation Analysis ◽  
Information Content ◽  
Electric Dipole ◽  
Low Energy ◽  
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 REVIEW OF THE PHENOMENOLOGY OF NONCOMMUTATIVE GEOMETRY

2004 ◽  
Vol 19 (02) ◽  
pp. 179-204 ◽  
Author(s):  
I. HINCHLIFFE ◽  
N. KERSTING ◽  
Y. L. MA
Keyword(s):  
Electric Dipole ◽  
Particle Physics ◽  
Extra Dimensions ◽  
Linear Collider ◽  
Dipole Moments ◽  
High Energy ◽  
Low Energy ◽  
Electric Dipole Moments ◽  
The Status ◽  
High Energy Scattering

We present a pedagogical review of particle physics models that are based on the noncommutativity of space–time, [Formula: see text], with specific attention to the phenomenology these models predict in particle experiments either in existence or under development. We summarize results obtained for high energy scattering such as would occur, for example, in a future e+e-linear collider with [Formula: see text], as well as low energy experiments such as those pertaining to elementary electric dipole moments and other CP violating observables, and finally comment on the status of phenomenological work in cosmology and extra dimensions.

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 Top partner-resonance interplay in a composite Higgs framework

2018 ◽  
Vol 33 (11) ◽  
pp. 1841008 ◽  
Author(s):  
Juan Yepes ◽  
Alfonso Zerwekh
Keyword(s):  
Symmetry Breaking ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Low Energy ◽  
Vector Resonance ◽  
Electric Dipole Moments ◽  
Parameter Spaces ◽  
Standard Model Fermion ◽  
Composite Higgs ◽  
The Standard Model

Guided us by the scenario of weak scale naturalness and the possible existence of exotic resonances, we have explored in a [Formula: see text] Composite Higgs setup the interplay among three matter sectors: elementary, top partners and vector resonances. We parametrize it through explicit interactions of spin-1 [Formula: see text]-resonances, coupled to the [Formula: see text]-invariant fermionic currents and tensors presented in this work. Such invariants are built upon the Standard Model fermion sector as well as top partners sourced by the unbroken [Formula: see text]. The mass scales entailed by the top partner and vector resonance sectors will control the low energy effects emerging from our interplaying model. Its phenomenological impact and parameter spaces have been considered via flavor-dijet processes and electric dipole moments bounds. Finally, the strength of the Nambu–Goldstone symmetry breaking and the extra couplings implied by the top partner mass scales are measured in accordance with expected estimations.

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.

Cross-correlation analysis and information content of observed heads during pumping in unconfined aquifers

2013 ◽  
Vol 49 (2) ◽  
pp. 713-731 ◽  
Author(s):  
Deqiang Mao ◽  
Tian-Chyi J. Yeh ◽  
Li Wan ◽  
Cheng-Haw Lee ◽  
Kuo-Chin Hsu ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Information Content ◽  
Cross Correlation ◽  
Unconfined Aquifers ◽  
Cross Correlation Analysis

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

Prospects for Electric Dipole Moment Measurement Using Electrostatic Accelerators

2019 ◽  
Vol 10 (01) ◽  
pp. 267-301
Author(s):  
Richard Talman
Keyword(s):  
Elementary Particle ◽  
Electric Fields ◽  
Electric Dipole ◽  
Particle Physics ◽  
Nuclear Physics ◽  
Dipole Moments ◽  
High Energy ◽  
Low Energy ◽  
Diagnostic Tools ◽  
Elementary Particle Physics

Electrostatic accelerators have played a glorious role in physics, especially for low energy atomic and nuclear physics and electron microscopy. But circular accelerators have depended almost exclusively on the far greater bending force possible with static magnetic, rather than electric, fields. There is a potential exception to this magnetic bending monopoly for experimental high energy elementary particle physics — it is the possibility of measuring the electric dipole moments (EDMs) of charged elementary particles, such as proton, deuteron, or electron, using an electrostatic storage ring. Any such non-zero EDM would demonstrate violation of both parity (P) and time-reversal (T) invariance. One way of understanding the preponderance of matter over anti-matter in the present-day universe pre-supposes the existence of violations of P and T substantially greater than are allowed by the “standard model” of elementary particle physics. This provides the leading motivation for measuring EDMs. Currently, only upper limits are known for these EDMs. The very same smallness that makes it important to determine them makes their measurement difficult. Accepting as obvious the particle physics motivation, this paper concentrates on the accelerator physics of the (not very) high energy electrostatic accelerators needed for EDM measurements. Developments already completed are emphasized. Impressive advances have been made in the diagnostic tools, spin control and polarimetry that will make EDM measurement possible. Ring design for minimizing spin decoherence and limiting systematic EDM errors is presented. There have, however, been worrisome indications from low energy rings, concerning beam current limitations. A prototype ring design is proposed for investigating and addressing this concern.

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