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Observation of selective enhancement of the capture of ultracold neutrons by nuclei (1997)

Arzumanov, S. S. ; Bondarenko, L. N. ; Korobkina, E. I. ; [weitere]

Springer

JETP letters 65 (1997), S. 1-6

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ISSN: 1090-6487

Schlagwort(e): 78.70.Nx ; 28.20.−v

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The subbarrier reflection of ultracold neutrons (UCNs) from stainless steel (an alloy of iron, nickel, chromium, and titanium) is investigated by means of neutron-radiation analysis. It is found that the increase in the probability of capture of UCNs by nuclei is large compared to the standard theory. The effect is selective, the enhancement factor varying From 3 for iron to 90 for titanium.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567325

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Digitale Medien

Experimental study of quasi-elastic scattering of ultracold neutrons (2002)

Steyerl, A. ; Yerozolimsky, B.G. ; Serebrov, A.P. ; [weitere]

Springer

The European physical journal 28 (2002), S. 299-304

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ISSN: 1434-6036

Schlagwort(e): PACS. 61.12.-q Neutron diffraction and scattering – 61.12.Ex Neutron scattering techniques (including small-angle scattering) – 66.10.Cb Diffusion and thermal diffusion

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Ultracold neutrons (UCN) are lost from traps if they are quasi-elastically scattered from the wall with an energy gain sufficient to exceed the Fermi potential for the wall. Possible mechanisms of a quasi-elastic energy transfer are, for instance, scattering from hydrogen diffusing in an impurity surface layer or on surface waves at a liquid wall. Using two different experimental methods at the UCN source of the Institut Laue-Langevin we have investigated both the energy-gain and the energy-loss side of quasi-elastic UCN scattering on Fomblin grease coated walls. For Fomblin oil and similar new types of oil we report up-scattering data as a function of temperature and energy transfer. These low-temperature oils may be used in an improved measurement of the neutron lifetime, which requires extremely low wall reflection losses.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epjb/e2002-00233-7

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Destruction of26Al in explosive nucleosynthesis (1986)

Trautvetter, H. P. ; Becker, H. W. ; Heinemann, U. ; [weitere]

Springer

The European physical journal 323 (1986), S. 1-11

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ISSN: 1434-601X

Schlagwort(e): 25.90 ; 95.90

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The26Al(n, p)26Mg reaction has been studied using neutron spectra which closely resembled Maxwell-Boltzmann (M.-B.) distributions with thermal energies ofkT=40 ×10−6, 31 and 71 keV and also forE n =270–350 keV. These energies correspond to stellar temperaturesT 9=4.6×10−7, 0.36, 0.82 and 3.1–4.1, whereT 9 is in units of 109 K. The partial cross sections for thep 0-(p 1-)transition are found to equal 26±10(1,850 ±150), 13±6(124±17), 16±13(84±14) and 21±8(72±15) mb for the above neutron spectra, respectively. The astrophysical reaction rate is determined for the combinedp 0- andp 1-transitions to beN A 〈σν〉=(0.324±0.026, 20.5±2.7, 22.6±4.3 and 38.7±11.1) ×106 cm3 mole−1 s−1. The results are compared with previous investigations and with statistical model calculations.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01294550

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