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**Harvard**

Holmvall, P., Köster, U., Heinz, A. och Nilsson, T. (2017) *Collinear cluster tri-partition: Kinematics constraints and stability of collinearity*.

** BibTeX **

@article{

Holmvall2017,

author={Holmvall, Patric and Köster, Ulli and Heinz, Andreas Martin and Nilsson, Thomas},

title={Collinear cluster tri-partition: Kinematics constraints and stability of collinearity},

journal={Physical Review C},

issn={2469-9985},

volume={95},

issue={014602},

abstract={A new mode of nuclear fission has been proposed by the FOBOS collaboration,
called Collinear Cluster Tri-partition (CCT), suggesting that three heavy
fission fragments can be emitted perfectly collinearly in low-energy fission.
It is surprising that CCT escaped observation for so long given the relatively
high reported yield, of roughly 0.5% relative to binary fission. These claims
call for an independent verification with a different experimental technique.
Verification experiments based on direct observation of CCT fragments with
fission fragment spectrometers require guidance with respect to the allowed
kinetic energy range, which we present in this paper. We discuss corresponding
model calculations which, if CCT is found in such verification experiments,
could indicate how the breakups proceed. We also study the intrinsic stability
of collinearity.
Three different decay models are used, which span together the timescales of
three-body fission. These models are used to calculate the possible kinetic
energy ranges of CCT fragments in 235U(n,f) and 252Cf(sf). We use
semi-classical trajectory calculations with a Monte-Carlo method to study the
intrinsic stability of collinearity.
CCT has a high net Q-value, but in a sequential decay, the intermediate steps
are energetically and geometrically unfavorable or even forbidden. Moreover,
perfect collinearity is extremely unstable, and broken by the slightest
perturbation.
According to our results, the central fragment would be very difficult to
detect due to its low kinetic energy, raising the question of why previous
experiments could not detect a missing-mass signature corresponding to CCT. We
find that a realization of CCT would require an unphysical fine-tuning of the
initial conditions. Our results enable independent experimental verification
and encourage further critical theoretical studies of CCT.},

year={2017},

keywords={Fission, Ternary Fission, Collinear Cluster Tri-partition, Trajectory calculations, Monte-Carlo simulations},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 246433

A1 Holmvall, Patric

A1 Köster, Ulli

A1 Heinz, Andreas Martin

A1 Nilsson, Thomas

T1 Collinear cluster tri-partition: Kinematics constraints and stability of collinearity

YR 2017

JF Physical Review C

SN 2469-9985

VO 95

IS 014602

AB A new mode of nuclear fission has been proposed by the FOBOS collaboration,
called Collinear Cluster Tri-partition (CCT), suggesting that three heavy
fission fragments can be emitted perfectly collinearly in low-energy fission.
It is surprising that CCT escaped observation for so long given the relatively
high reported yield, of roughly 0.5% relative to binary fission. These claims
call for an independent verification with a different experimental technique.
Verification experiments based on direct observation of CCT fragments with
fission fragment spectrometers require guidance with respect to the allowed
kinetic energy range, which we present in this paper. We discuss corresponding
model calculations which, if CCT is found in such verification experiments,
could indicate how the breakups proceed. We also study the intrinsic stability
of collinearity.
Three different decay models are used, which span together the timescales of
three-body fission. These models are used to calculate the possible kinetic
energy ranges of CCT fragments in 235U(n,f) and 252Cf(sf). We use
semi-classical trajectory calculations with a Monte-Carlo method to study the
intrinsic stability of collinearity.
CCT has a high net Q-value, but in a sequential decay, the intermediate steps
are energetically and geometrically unfavorable or even forbidden. Moreover,
perfect collinearity is extremely unstable, and broken by the slightest
perturbation.
According to our results, the central fragment would be very difficult to
detect due to its low kinetic energy, raising the question of why previous
experiments could not detect a missing-mass signature corresponding to CCT. We
find that a realization of CCT would require an unphysical fine-tuning of the
initial conditions. Our results enable independent experimental verification
and encourage further critical theoretical studies of CCT.

LA eng

DO 10.1103/PhysRevC.95.014602

LK http://link.aps.org/doi/10.1103/PhysRevC.95.014602

LK http://publications.lib.chalmers.se/records/fulltext/246433/local_246433.pdf

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