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Binary fission and coplanar cluster decay of 60Zn compound nuclei at high angular momentum. / Zherebchevsky, V.; von Oertzen, W.; Kamanin, D.; Gebauer, B.; Thummerer, S.; Schulz, Ch; Royer, G.
в: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Том 646, № 1, 01.03.2007, стр. 12-18.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Binary fission and coplanar cluster decay of 60Zn compound nuclei at high angular momentum
AU - Zherebchevsky, V.
AU - von Oertzen, W.
AU - Kamanin, D.
AU - Gebauer, B.
AU - Thummerer, S.
AU - Schulz, Ch
AU - Royer, G.
PY - 2007/3/1
Y1 - 2007/3/1
N2 - Fission decays with two heavy fragments in coincidence have been measured from 60Ni compound nuclei, formed in the 36Ar + 24Mg reaction at Elab (36Ar) = 195 MeV (5.4 MeV/A). The experiment was performed with a unique kinematic coincidence set-up consisting of two large area position sensitive (x, y) gas detector telescopes with Bragg-ionisation chambers. Very narrow out-of-plane correlations are observed for two heavy fragments emitted in either purely binary events or in events with a missing mass consisting of 2, 3 and 4 α-particles. The broad out-of-plane distributions correspond to binary fission with the evaporation of α-particles or nucleons from excited fragments. The narrow correlations are interpreted as ternary coplanar cluster decay from compound nuclei at high angular momenta through elongated shapes with large moments of inertia, and the lighter mass remains with very low momentum in the centre of mass frame. It is shown in calculations of shapes, that the large moments of inertia of the hyper-deformed configurations expected in these nuclei, will lower the ternary fission barrier so as to make a competition with binary fission possible.
AB - Fission decays with two heavy fragments in coincidence have been measured from 60Ni compound nuclei, formed in the 36Ar + 24Mg reaction at Elab (36Ar) = 195 MeV (5.4 MeV/A). The experiment was performed with a unique kinematic coincidence set-up consisting of two large area position sensitive (x, y) gas detector telescopes with Bragg-ionisation chambers. Very narrow out-of-plane correlations are observed for two heavy fragments emitted in either purely binary events or in events with a missing mass consisting of 2, 3 and 4 α-particles. The broad out-of-plane distributions correspond to binary fission with the evaporation of α-particles or nucleons from excited fragments. The narrow correlations are interpreted as ternary coplanar cluster decay from compound nuclei at high angular momenta through elongated shapes with large moments of inertia, and the lighter mass remains with very low momentum in the centre of mass frame. It is shown in calculations of shapes, that the large moments of inertia of the hyper-deformed configurations expected in these nuclei, will lower the ternary fission barrier so as to make a competition with binary fission possible.
KW - Ar +Mg, E = 195 MeV
KW - Binary and ternary fission channels
KW - Fission
KW - Heavy ion reactions
KW - Kinematic coincidences for heavy fragments
KW - Out-of-plane correlations
UR - http://www.scopus.com/inward/record.url?scp=33846884398&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2006.12.061
DO - 10.1016/j.physletb.2006.12.061
M3 - Article
AN - SCOPUS:33846884398
VL - 646
SP - 12
EP - 18
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1
ER -
ID: 9129107