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The spin-dependent nd scattering length - a proposed high-accuracy measurement | B. van den Brandt
; H.W. Griesshammer
; P. Hautle
; J. Kohlbrecher
; J.A. Konter
; O. Zimmer
; | Date: |
23 Dec 2003 | Journal: | Nucl.Instrum.Meth. A526 (2004) 91-95 | Subject: | nucl-ex | Abstract: | The understanding of few-nucleon systems at low energies is essential, e.g. for accurate predictions of element abundances in big-bang and stellar fusion. Novel effective field theories, taking only nucleons, or nucleons and pions as explicit degrees of freedom, provide a systematic approach, permitting an estimate of theoretical uncertainties. Basic constants parameterising the short range physics are derived from only a handful of experimental values. The doublet neutron scattering length a_2 of the deuteron is particularly sensitive to a three-nucleon contact interaction, but experimentally known with only 6% accuracy. It can be deduced from the two experimentally accessible parameters of the nd scattering length. We plan to measure the poorly known "incoherent" nd scattering length a_{i,d} with 10^{-3} accuracy, using a Ramsey apparatus for pseudomagnetic precession with a cold polarised neutron beam at PSI. A polarised target containing both deuterons and protons will permit a measurement relative to the incoherent np scattering length, which is know experimentally with an accuracy of 2.4 imes 10^{-4}. | Source: | arXiv, nucl-ex/0401029 | Services: | Forum | Review | PDF | Favorites |
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