Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating

Serebrov, A. P.; Varlamov, V. E.; Харитонов, А. Г.; Fomin, A. K.; Pokotilovski, Yu. N.; Geltenbort, P.; Butterworth, James; Krasnoschekova, I. A.; Lasakov, M. S.; Tal'Daev, R. R.; Vassiljev, A. V.; Zherebtsov, O. M.

doi:10.1016/j.physletb.2004.11.013

Cited by 313 publications

(343 citation statements)

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“…First of all, a small loss factor of only 210 -6 per collision of UCN with trap walls results in a low loss probability of only 1% of the probability of neutron -decay. Therefore the measurement of neutron lifetime was almost direct; the extrapolation from the best storage time to the neutron lifetime was only 5 s. In these conditions it is practically impossible to obtain a systematical error of about 7 s. The quoted systematical error of the experimental result [1] was 0.3 s.…”

Section: Introductionmentioning

confidence: 96%

“…The recent neutron lifetime experiment [1] has provided the value 878.5 ± 0.8 s. It differs by 6.5 standard deviations from the world average value 885.7 ± 0.8 s quoted by the particle data group (PDG) in 2006 [2]. The experiment employed a gravitational trap with low-temperature fluorinated oil (fomblin) coating, which provides several advantages with respect to previous experiments.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand a new value of neutron lifetime from work [1] cannot be included in the world average value because of the big difference of results.…”

Section: Introductionmentioning

confidence: 99%

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Neutron lifetime from a new evaluation of ultracold neutron storage experiments

Serebrov

Fomin

2010

Phys. Rev. C

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Neutron lifetime from a new evaluation of ultracold neutron storage experiments

Serebrov

Fomin

2010

Phys. Rev. C

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“…This was for a long time the only source with sufficient UCNs available. At the beginning experiments concentrated on measurements of the free neutron lifetime (τ n ) [5][6][7][8] and on the search for a permanent electric dipole moment of the neutron (nEDM) [9][10][11][12][13]. In addition to the fundamental particle aspect, τ n is also an important quantity in understanding the primordial nucleo-synthesis and contributes presently one of the larger uncertainties to its description [14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of ultracold neutron sources for fundamental physics measurements

et al. 2017

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Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new CP violating processes or exotic interactions beyond the Standard Model of particle physics. The most prominent example is the search for a permanent electric dipole moment of the neutron (nEDM). We have performed an experimental comparison of the leading UCN sources currently operating. We have used a 'standard' UCN storage bottle with a volume of 32 liters, comparable in size to nEDM experiments, which allows us to compare the UCN density available at a given beam port.

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“…The number quoted is a result of averaging of several conflicting experimental data. Experiments with neutron beams [1] and with ultracold neutrons in a magnetic bottle [2] produce results that differ by as much as 8 s. Nuclei can be stable against neutron decay only because the nuclear forces prefer an optimal ratio between the proton and neutron numbers so that the spontaneous neutron decay inside the nucleus may be energetically forbidden. Moreover, nuclei with proton excess may undergo beta-decay in the opposite direction transforming protons into neutrons.…”

Section: Proton and Neutron 3 Proton And Neutronmentioning

confidence: 99%

Building Blocks and Interactions

2017

Physics of Atomic Nuclei

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The standard textbook statement reads "Nuclei consist of protons and neutrons." For the major part of what we are going to discuss in the course, this simple notion is approximately true. Indeed, complex nuclei in the Universe were mostly "cooked" in stars by the processes of consecutive addition of neutrons and protons and their mutual transformations. It is relatively easy to extract these particles back from the nuclei since the separation energy per particle is typically only 6-8 MeV, less than 1% of the mass of the proton (p) or neutron (n) that is of order ∼ 1 GeV = 10 3 MeV.In many nuclei with an abnormal ratio between the proton and neutron numbers, the separation energy is even significantly lower than the value mentioned earlier. And still the statement of our first sentence has a limited range of validity. In general, the answer to the question of nuclear constituents depends on the kind of phenomena we are interested in. Various experimental studies emphasize different aspects of nuclear structure. Different patterns can be resolved at different energy scales by specifically adjusted experimental tools.The nuclear forces that keep the nucleus together are induced through exchange by mediating quanta -mesons, similar to how the electromagnetic interactions are generated by the exchange of photons. Roughly speaking, at energies small compared to the masses of particles that are capable of serving as mediators of nuclear forces, the nucleus indeed looks as an object composed of protons and neutrons. (Note that such a range of energies does not exist in the case of electromagnetic interactions carried by massless photons.) Protons and neutrons have very similar nuclear properties, and they are called by a unifying term "nucleons" (N). The mesons of the lightest family, pions ( +,0,− ), are approximately seven times lighter than the nucleons. Corresponding energies E < m c 2 ≈ 140 MeV define a domain of low-energy nuclear physics where the nucleus can be considered as being made of nonrelativistic nucleons. In this domain, mesons are virtual particles hidden in nucleon-nucleon interactions, and they rarely appear Physics of Atomic Nuclei, First Edition. Vladimir Zelevinsky and Alexander Volya.

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Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating

Cited by 313 publications

References 7 publications

Neutron lifetime from a new evaluation of ultracold neutron storage experiments

Neutron lifetime from a new evaluation of ultracold neutron storage experiments

Comparison of ultracold neutron sources for fundamental physics measurements

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