ZIB

1

Digitale Medien

Low-lying positive parity states in ^1^9^5Ir following double neutron capture

Colvin, G.G. ; Borner, H.G. ; Geltenbort, P. ; [weitere]

Amsterdam : Elsevier

Nuclear Physics, Section A 465 (1987), S. 240-264

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 0375-9474

Schlagwort(e): Nuclear reactions ; Nuclear structure

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Physik

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(87)90433-7

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

2

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

zur Merkliste hinzufügen auf der Merkliste

Details

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

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

3

Digitale Medien

Observation of extremely strong neutron scattering (1998)

Meshcherov, B. R. ; Fomin, A. I. ; Chernyavskii, S. M. ; [weitere]

Springer

JETP letters 67 (1998), S. 307-311

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1090-6487

Schlagwort(e): 61.12.Ex ; 61.43.Er

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The spectral dependence of the transmission of a collimated neutron beam by disordered quartz microstructures is measured. The observed mean free paths are very short, down to 200 nm. The results show that scattering with a characteristic value of the parameter kl⩽10 is realized near the neutron total external reflection edge.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567665

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

4

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

zur Merkliste hinzufügen auf der Merkliste

Details

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

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

5

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

zur Merkliste hinzufügen auf der Merkliste

Details

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

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

6

Digitale Medien

Search for anomalous transmission of ultracold neutrons through metal foils (1998)

Muzychka, Al. Yu. ; Pokotilovskii, Yu. N. ; Geltenbort, P.

Springer

JETP letters 67 (1998), S. 459-463

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1090-6487

Schlagwort(e): 25.40.Dn

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Results are presented on the search for anomalous transmission of ultracold neutrons (UCNs) through beryllium (thickness ∼0.14 mm), stainless steel (0.05 and 0.015 mm), and copper (0.01 and 0.018 mm) foils. This anomalous transmission is considered to be a possible reason for the disappearance of UCNs from beryllium bottles, an effect which was discovered in experiments at the St. Petersburg Nuclear Physics Institute and which was recently observed in the experiment of V. E. Varlamov et al., JETP Lett. 66, 336 (1997). No transmission was found in our measurements at the 10−7 level except in the case of copper foils, which we attribute to the presence in the UCN flux of an admixture of neutrons with energies higher than the boundary energy for copper.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1134/1.567710

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

7

Digitale Medien

Cold deformed fission in232U(n, f) and239Pu(n, f) (1992)

Kaufmann, J. ; Mollenkopf, W. ; Gönnenwein, F. ; [weitere]

Springer

The European physical journal 341 (1992), S. 319-326

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1434-601X

Schlagwort(e): 25.85.Ec

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Masses, charges and kinetic energies of light fission fragments from the reactions232U(n, f) and239Pu(n, f) induced by thermal neutrons have been measured on the Cosi fan tutte spectrometer of the Institut Laue-Langevin in Grenoble. Both at very high and very low kinetic energies marked fine structures in the mass yields and odd-even staggerings in the charge yields are observed. In the framework of a scission point model the results are shown to point to compact and deformed scission configurations, respectively, where at scission the fragments carry no intrinsic excitation energy. The two limiting processes may, therefore, be called cold compact fission (usually known as cold fission) and cold deformed fission. The latter process as a general phenomenon of low energy fission has come into focus only recently.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01283541

Permalink

Bibliothek	Standort	Signatur	Band/Heft/Jahr	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext