English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have performed high-precision measurements of the coherent neutronscattering lengths of gas phase molecular hydrogen and deuterium using neutroninterferometry. After correcting for molecular binding and multiple scatteringfrom the molecule, we find b_{np} = (-3.7384 +/- 0.0020) fm and b_{nd} =(6.6649 +/- 0.0040) fm. Our results are in agreement with the world average ofprevious Measurements, b_{np} = (-3.7410 +/- 0.0010) fm and b_{nd} = (6.6727+/- 0.0045) fm. The new world averages for the n-p and n-d coherent scatteringlengths, including our new results, are b_{np} = (-3.7405 +/- 0.0009) fm andb_{nd} = (6.6683 +/- 0.0030) fm. We compare bnd with the calculations of thedoublet and quartet scattering lengths of several nucleon-nucleon potentialmodels and show that almost all known calculations are in disagreement with theprecisely measured linear combination corresponding to the coherent scatteringlength. Combining the world data on b_{nd} with the modern high-precisiontheoretical calculations of the quartet n-d scattering lengths recentlysummarized by Friar et al., we deduce a new value for the doublet scatteringlength of ^{2}a_{nd} = [0.645 +/- 0.003(expt) +/- 0.007(theory)] fm. This valueis a factor of 4, more precise than the previously accepted value of ^{2}a_{nd}= [0.65 +/- 0.04(expt)] fm. The current state of knowledge of scatteringlengths in the related p-d system, ideas for improving by a factor of 5 theaccuracy of the b_{np} and b_{nd} measurements using neutron interferometry,and possibilities for further improvement of our knowledge of the coherentneutron scattering lengths of 3H, 3He, and 4He are discussed.Comment: 22 pages, 19 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Precision neutron interferometric measurements and updated evaluations of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>−</mml:mo><mml:mi>d</mml:mi></mml:math>coherent neutron scattering lengths

Precision neutron interferometric measurements and updated evaluations of then−pandn−dcoherent neutron scattering lengths