Nuclear Rms charge radii from relative electron scattering measurements at low energies

1973 ◽  
Vol 265 (4) ◽  
pp. 401-403 ◽  
Author(s):  
G. Fey ◽  
H. Frank ◽  
W. Sch�tz ◽  
H. Theissen
Keyword(s):  
Electron Scattering ◽  
Charge Radii ◽  
Scattering Measurements ◽  
Low Energies ◽  
Nuclear Rms Charge Radii ◽  
Relative Electron

Illuminating the proton radius conundrum: the μHe+ Lamb shiftThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 47-57 ◽  
Author(s):  
A. Antognini ◽  
F. Biraben ◽  
J. M.R. Cardoso ◽  
D. S. Covita ◽  
A. Dax ◽  
...  
Keyword(s):  
Nuclear Polarization ◽  
Bound State ◽  
Atomic Systems ◽  
Charge Radii ◽  
Polarization Contribution ◽  
Proton Radius ◽  
Nuclear Rms Charge Radii ◽  
Proton Radius Puzzle ◽  
Bound State Qed

We plan to measure several 2S–2P transition frequencies in μ4He+ and μ3He+ by means of laser spectroscopy with an accuracy of 50 ppm. This will lead to a determination of the corresponding nuclear rms charge radii with a relative accuracy of 3 × 10−4, limited by the uncertainty of the nuclear polarization contribution. First, these measurements will help to solve the proton radius puzzle. Second, these very precise nuclear radii are benchmarks for ab initio few-nucleon theories and potentials. Finally when combined with an ongoing measurement of the 1S–2S transition in He+, these measurements will lead to an enhanced bound-state QED test of the 1S Lamb shift in He+.

Isoscalar and Isovector Form Factors ofH3andHe3forQbelow 2.9fm−1from Electron-Scattering Measurements

1987 ◽  
Vol 59 (20) ◽  
pp. 2388-2388 ◽  
Author(s):  
D. Beck ◽  
A. Bernstein ◽  
I. Blomqvist ◽  
H. Caplan ◽  
D. Day ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Form Factors ◽  
Scattering Measurements

scholarly journals CHARGE RADII OF β-STABLE NUCLEI

2006 ◽  
Vol 21 (24) ◽  
pp. 1889-1900 ◽  
Author(s):  
G. K. NIE
Keyword(s):  
Stable Isotopes ◽  
Stable Isotope ◽  
Electron Scattering ◽  
Cluster Structure ◽  
Alpha Decay ◽  
Heavy Nuclei ◽  
Β Decay ◽  
Charge Radii ◽  
The Core

In a previous work it was shown that the radius of a nucleus R is determined by the α-cluster structure and can be estimated on the number of α-clusters disregarding the number of excess neutrons. A hypothesis was also made that the radius Rm of a β-stable isotope, which is actually measured at electron scattering experiments, is determined by the volume occupied by the matter of the core plus the volume occupied by the charge of the peripheral α-clusters. In this paper it is shown that the condition Rm = R restricts the number of excess neutrons filling the core to provide the β-stability. The number of peripheral clusters can vary from 1 to 5 and the value of R for heavy nuclei almost does not change, whereas the number of the excess neutrons should change with the number of peripheral clusters to provide the condition of Rm = R. It can explain the path of the β-stability and its width. The radii Rm of the stable isotopes with 12 ≤ Z ≤ 83 and the alpha-decay isotopes with 84 ≤ Z ≤ 116 that are stable to β-decay have been calculated.

scholarly journals Light WIMP Searches Involving Electron Scattering

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
J. D. Vergados ◽  
Ch. C. Moustakidis ◽  
Yeuk-Kwan E. Cheung ◽  
H. Ejiri ◽  
Yeongduk Kim ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Electron Scattering ◽  
Mass Range ◽  
Bound State ◽  
Particle Model ◽  
Electron Mass ◽  
Bound State Wave Function ◽  
Low Energies ◽  
The Cross

In the present work we examine the possibility of detecting electrons in light dark matter searches. These detectors are considered to be the most appropriate for detecting dark matter particles with a mass in the MeV region. We analyze theoretically some key issues involved in such detection. More specifically we consider a particle model involving WIMPs interacting with fermions via Z-exchange. We find that for WIMPs with mass in the electron mass range the cross section for WIMP-atomic electron scattering is affected by the electron binding. For WIMPs more than 20 times heavier than the electron, the binding affects the kinematics very little. As a result, many electrons can be ejected with energy which increases linearly with the WIMP mass, but the cross section is somewhat reduced depending on the bound state wave function employed. On the other hand for lighter WIMPs, the effect of binding is dramatic. More specifically at most 10 electrons, namely, those with binding energy below 10 eV, become available even in the case of WIMPs with a mass as large as 20 times the electron mass. Even fewer electrons contribute if the WIMPs are lighter. The cross section is, however, substantially enhanced by the Fermi function corrections, which become more important at low energies of the outgoing electrons. Thus events of 0.5–2.5 per kg-y become possible.

Electron Scattering Measurements of Interest to the Neutrino Physics Community

2007 ◽  
Author(s):  
R. Bradford ◽  
Geralyn P. Zeller ◽  
Jorge G. Morfin ◽  
Flavio Cavanna
Keyword(s):  
Neutrino Physics ◽  
Electron Scattering ◽  
Physics Community ◽  
Scattering Measurements

Isoscalar and isovector form factors ofH3andHe3forQbelow 2.9fm−1from electron-scattering measurements

1987 ◽  
Vol 59 (14) ◽  
pp. 1537-1540 ◽  
Author(s):  
D. Beck ◽  
A. Bernstein ◽  
I. Blomqvist ◽  
H. Caplan ◽  
D. Day ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Form Factors ◽  
Scattering Measurements

Evaluation procedure for nuclear RMS charge radii

1991 ◽  
Vol 69 (3-4) ◽  
pp. 233-247
Author(s):  
I. Angeli
Keyword(s):  
Evaluation Procedure ◽  
Charge Radii ◽  
Nuclear Rms Charge Radii

Optical potential and escape depth for electron scattering at very low energies

1999 ◽  
Vol 101-103 ◽  
pp. 473-478 ◽  
Author(s):  
C. Solterbeck ◽  
O. Tiedje ◽  
T. Strasser ◽  
S. Brodersen ◽  
A. Bödicker ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Optical Potential ◽  
Escape Depth ◽  
Low Energies

scholarly journals The higher-order structure of chromatin: evidence for a helical ribbon arrangement.

1984 ◽  
Vol 99 (1) ◽  
pp. 42-52 ◽  
Author(s):  
C L Woodcock ◽  
L L Frado ◽  
J B Rattner
Keyword(s):  
Ionic Strength ◽  
Electron Scattering ◽  
Helical Structure ◽  
Histone H1 ◽  
Higher Order ◽  
Order Structure ◽  
Helical Ribbon ◽  
Double Helical Structure ◽  
Scattering Measurements ◽  
Preparation Techniques

Both intact and nuclease-isolated chromatin fibers have been examined at different degrees of salt-induced compaction, using a variety of preparation techniques. The results suggest that the initial folding step in nucleosome packing involves the formation of a zig-zag ribbon as has been proposed by others (Thoma F., T. Koller, and A. Klug, 1979, J. Cell Biol., 83:403-427; Worcel A., S. Strogartz, and D. Riley, 1981, Proc. Natl. Acad. Sci. USA, 78:1461-1465), and that subsequent compaction occurs by coiling of the ribbon to form a double helical structure. This type of folding generates a fiber in which the nucleosome-nucleosome contacts established in the zig-zag ribbon are maintained and in which the histone H1 molecules occupy equivalent sites. The diameter of the fiber is not dependent upon the nucleosome repeat length. Direct mass values for individual isolated fibers obtained from electron scattering measurements showed that the mass per length was dependent on ionic strength, and ranged from 6.0 X 10(4) daltons/nm at 10 mM NaCl to 27 X 10(4) daltons/nm at 150 mM salt. These values are equivalent to 2.5 nucleosomes/11 nm at 10 mM NaCl and to 11.6 nucleosomes/11 nm at 150 mM salt and are consistent with the range of packing ratios for the proposed helical ribbon.

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