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Title: True ternary fission, the collinear cluster tripartition (CCT) of {sup 252}Cf

Abstract

In systematic work over the last decade (see Pyatkov et al. [12] and refs therein), the ternary fission decay of heavy nuclei, in {sup 235}U(n,fff) and {sup 252}Cf(sf) has been studied in a collinear geometry. The name used for this process is (CCT), with three fragments of similar size in a collinear decay, it is the true ternary fission. This decay has been observed in spontaneous fission as well as in a neutron induced reaction. The measurements are based on different experimental set-ups, with binary coincidences containing TOF and energy determinations. With two detector telescopes placed at 180 Degree-Sign , the measurements of masses and energies of each of the registered two fragments, give complete kinematic solutions. Thus the missing mass events in binary coincidences can be determined, these events are obtained by blocking one of the lighter fragments on a structure in front of the detectors. The relatively high yield of CCT (more than 10{sup -3} per binary fission) is explained. It is due to the favourable Q-values (more positive than for binary) and the large phase space of the ternary CCT-decay, dominated by three (magic) clusters: e.g. isotopes of Sn, Ca and Ni, {sup 132}Sn+{sup 50}Ca+{sup 70}Ni. Itmore » is shown that the collinear (prolate) geometry has the favoured potential energy relative to the oblate shapes. The ternary fission is considered to be a sequential process. With this assumption the kinetic energies of the fragments have been calculated by Vijay et al.. The third fragments have very low kinetic energies (below 20 MeV) and have thus escaped their detection in previous work on 'ternary fission', where in addition an oblate shape and a triangle for the momentum vectors have been assumed.« less

Authors:
; ;  [1];  [2];  [3]
  1. Helmholtz Zentrum, D14109 Berlin (Germany)
  2. (Russian Federation)
  3. (Russian Federation) and Helmholtz Zentrum, D14109 Berlin (Germany)
Publication Date:
OSTI Identifier:
22075628
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1491; Journal Issue: 1; Conference: Conference on nuclear structure and dynamics 2012, Opatija (Croatia), 9-13 Jul 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BINARY FISSION; CALCIUM 50; CALIFORNIUM 252; CLUSTER MODEL; KINETIC ENERGY; MEV RANGE; MISSING MASS; NEUTRONS; NICKEL 70; NUCLEAR DECAY; NUCLEAR FRAGMENTATION; NUCLEAR REACTION YIELD; PHASE SPACE; SPONTANEOUS FISSION; TERNARY FISSION; TIN 132; URANIUM 235

Citation Formats

Oertzen, W. von, Pyatkov, Y. V., Kamanin, D., Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region, and Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region. True ternary fission, the collinear cluster tripartition (CCT) of {sup 252}Cf. United States: N. p., 2012. Web. doi:10.1063/1.4764262.
Oertzen, W. von, Pyatkov, Y. V., Kamanin, D., Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region, & Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region. True ternary fission, the collinear cluster tripartition (CCT) of {sup 252}Cf. United States. doi:10.1063/1.4764262.
Oertzen, W. von, Pyatkov, Y. V., Kamanin, D., Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region, and Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region. Sat . "True ternary fission, the collinear cluster tripartition (CCT) of {sup 252}Cf". United States. doi:10.1063/1.4764262.
@article{osti_22075628,
title = {True ternary fission, the collinear cluster tripartition (CCT) of {sup 252}Cf},
author = {Oertzen, W. von and Pyatkov, Y. V. and Kamanin, D. and Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region and Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow region},
abstractNote = {In systematic work over the last decade (see Pyatkov et al. [12] and refs therein), the ternary fission decay of heavy nuclei, in {sup 235}U(n,fff) and {sup 252}Cf(sf) has been studied in a collinear geometry. The name used for this process is (CCT), with three fragments of similar size in a collinear decay, it is the true ternary fission. This decay has been observed in spontaneous fission as well as in a neutron induced reaction. The measurements are based on different experimental set-ups, with binary coincidences containing TOF and energy determinations. With two detector telescopes placed at 180 Degree-Sign , the measurements of masses and energies of each of the registered two fragments, give complete kinematic solutions. Thus the missing mass events in binary coincidences can be determined, these events are obtained by blocking one of the lighter fragments on a structure in front of the detectors. The relatively high yield of CCT (more than 10{sup -3} per binary fission) is explained. It is due to the favourable Q-values (more positive than for binary) and the large phase space of the ternary CCT-decay, dominated by three (magic) clusters: e.g. isotopes of Sn, Ca and Ni, {sup 132}Sn+{sup 50}Ca+{sup 70}Ni. It is shown that the collinear (prolate) geometry has the favoured potential energy relative to the oblate shapes. The ternary fission is considered to be a sequential process. With this assumption the kinetic energies of the fragments have been calculated by Vijay et al.. The third fragments have very low kinetic energies (below 20 MeV) and have thus escaped their detection in previous work on 'ternary fission', where in addition an oblate shape and a triangle for the momentum vectors have been assumed.},
doi = {10.1063/1.4764262},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1491,
place = {United States},
year = {2012},
month = {10}
}