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1

Digitale Medien

Measurement of cold fission for ^2^2^9Th(n"t"h, f), ^2^3^2U(n"t"h, f) and ^2^3^9Pu(n"t"h, f) with the Cosi fan tutte spectrometer

Asghar, M. ; Boucheneb, N. ; Medkour, G. ; [weitere]

Amsterdam : Elsevier

Nuclear Physics, Section A 560 (1993), S. 677-688

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ISSN: 0375-9474

Schlagwort(e): NUCLEAR FISSION

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Physik

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(93)90040-5

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2

Digitale Medien

Level structure of ^1^9^1Os: Coexisting oblate and prolate configurations

Borner, H.G. ; Casten, R.F. ; Forster, I. ; [weitere]

Amsterdam : Elsevier

Nuclear Physics, Section A 534 (1991), S. 255-293

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ISSN: 0375-9474

Schlagwort(e): Nuclear Reactions

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Physik

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(91)90498-U

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3

Digitale Medien

Parity violation in ternary fission

Gonnenwein, F. ; Belozerov, A.V. ; Beda, A.G. ; [weitere]

Amsterdam : Elsevier

Nuclear Physics, Section A 567 (1994), S. 303-316

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ISSN: 0375-9474

Schlagwort(e): NUCLEAR FISSION

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1016/0375-9474(94)90150-3

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4

Digitale Medien

Parity nonconservation and Brosa modes in nuclear fission (1995)

Graf, U. ; Gönnenwein, F. ; Geltenbort, P. ; [weitere]

Springer

The European physical journal 351 (1995), S. 281-288

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ISSN: 1434-601X

Schlagwort(e): 24.80.Dc ; 25.85.Ec

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The parity nonconserving (PNC) asymmetry coefficient α for the angular distribution of fragment emission from binary fission of233U irradiated by polarized thermal neutrons has been measured. Complementary fragments were detected by a double ionization chamber with high resolving power. The experiment was carried out at the high flux reactor of the ILL, Grenoble. Integrated over all masses and energies of light fragments from asymmetric fission of234Uh, the PNC asymmetry coefficient is found to be α=(3.29±0.31) × 10−4.The positive sign of α indicates a preferential emission of light fragments parallel to the spin of neutrons inducing fission. Theory claims that PNC effects are sensitive to the properties of the fission barrier. On the other hand, one may wonder whether characteristics of eventual fragments are already specified at the barrier. The measurement of PNC asymmetries for distinct mass-energy ranges of fragments has been utilized to answer this question. Mass-energy distributions of fragments were analyzed along the lines of the Brosa model of fission as a superposition of individual modes. Within experimental uncertainty no mode dependence of asymmetric fission could be disclosed. The result is in keeping with the Brosa model where asymmetric modes bifurcate only once the standard fission barrier has been passed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01290909

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5

Digitale Medien

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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6

Digitale Medien

Observation of the penetration of subbarrier ultracold neutrons through beryllium foils and coatings (1997)

Varlamov, V. E. ; Nesvizhevskii, V. V. ; Serebrov, A. P. ; [weitere]

Springer

JETP letters 66 (1997), S. 336-343

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ISSN: 1090-6487

Schlagwort(e): 28.20.−v

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The subbarrier passage of ultracold neutrons through beryllium foils and coatings with a probability much higher than that of tunneling is observed. This effect may be responsible for the so-called anomalous loss of ultracold neutrons.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567518

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7

Digitale Medien

Experimental check of the dispersion law for ultracold neutrons (1998)

Bondarenko, I. V. ; Krasnoperov, A. V. ; Frank, A. I. ; [weitere]

Springer

JETP letters 67 (1998), S. 786-792

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ISSN: 1090-6487

Schlagwort(e): 28.20.Cz ; 11.55.Fv

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract An experiment to check the standard dispersion law for ultracold neutrons is described. The experiment is based on searching for a shift of the resonance line of a neutron interference filter as the neutron velocity component parallel to the filter surface is varied. The first results attest to a statistically significant effect. No mimicking effects were found in a control experiment, but their possible existence cannot be completely ruled out at present.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567749

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8

Digitale Medien

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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