Published 1975 | Version v1
Report Open

Display of rotational levels near the fission threshold in 232Th(n,f) reaction

Creators

Description

The 232Th(n,f) cross section has been measured relative to that of 235U up to 5MeV, with a neutron energy resolution of 3keV at 1.6MeV. The angular anisotropy of fission fragments has also been measured in the same energy range with an energy resolution of 6keV at 1,6MeV. The broad vibrational levels located above 1MeV are resolved into sharp structures which are interpreted as rotational states. The rotational constants h2/2J of highly deformed 233Th are found to be 2.45 and 2.65keV at 1.5 and 1.6MeV respectively. These results are interpreted by the possibility of a third minimum in the fission barrier

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

La section efficace de fission du 232Th a ete mesuree par rapport a celle de 235U jusqu'a 5MeV. La resolution en energie etait de 3keV a 1,6MeV. L'anisotropie angulaire des fragments de fission a egalement ete mesuree dans la meme gamme d'energie, mais avec une resolution de 6keV a 1,6MeV. Les resonances de vibration situees au-dessus de 1MeV ont ete resolues en structure fines mettant ainsi en evidence des bandes de rotation. Les courants h2/2J de deux bandes de rotations situees a 1,5 et 1,6MeV sont respectivement egales a 2.45 et 2.65keV. Ces resultats sont interpretes par la possibilite d'un troisieme minimum dans la barriere de fission du noyau compose 233Th

Files

7235817.pdf

Files (390.8 kB)

Name Size Download all
md5:333d7b371b18481265d9896f85f28ece
390.8 kB Preview Download

Additional details

Additional titles

Original title (French)
Mise en evidence de bandes de rotation pres du seuil de fission dans la reaction

Publishing Information

Imprint Pagination
10 p.
Report number
CEA-CONF--3181

Conference

Title
3. National soviet conference on neutron physics.
Dates
09 Jun 1975.
Place
Kiev, USSR.

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
7235817
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ANISOTROPY; CROSS SECTIONS; FINE STRUCTURE; FISSION; FISSION FRAGMENTS; MEV RANGE 01-10; NEUTRON REACTIONS; ROTATIONAL STATES; THORIUM 232 TARGET
Descriptors DEC
BARYON REACTIONS; ENERGY LEVELS; ENERGY RANGE; EXCITED STATES; HADRON REACTIONS; MEV RANGE; NUCLEAR REACTIONS; NUCLEON REACTIONS; TARGETS