Q- and Z-dependence of angular momentum transfer in deeply inelastic collisions of 86Kr with 209Bi

Dyer, P.; Puigh, R.J.; Vandenbosch, R.; Thomas, T. D.; Zisman, Michael S.; Nunnelley, L.L.

doi:10.1016/0375-9474(79)90342-7

Cited by 73 publications

(18 citation statements)

References 35 publications

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“…that the intermediate fissioning system passes through a compound nucleus stage "and looses all memory of the first reaction step except, of course, for the conserved quantities excitation energy and transferred spin. Specifically, the angular distribution of fission fragments has all properties of an intermediate system equilibrated in its shape and orientational degrees of freedom, and the second step fission probability is compatible with the expectations from the statistical model [7,11]. However, in recent inclusive and twobody coincidence measurements of the rather light collision systems 86Kr+ s9y and 166Er at the higher bombarding energy of 12.1 MeV/u, three-body events were found to occur with an unexpectedly large probability [13,14].…”

Section: Introductionmentioning

confidence: 74%

Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

et al. 1983

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Kinematically complete experiments have been performed on the two-and three-body exit channels in the reactions 84Kr+166Er and 129Xe+~22Sn at 12.5 MeV/u. Threebody events occur with an unusually high probability. They arise from a fast two-step mechanism where a sequential fission-like process follows a deep inelastic collision with preferentially very large energy losses. Strong Coulomb proximity effects are observed in the three-body final state which, treated quantitatively in Coulomb trajectory calculations, establish a time-scale of 1-10-2~s between the consecutive scission acts. The angular distribution of fission fragments is consistent with an orientation of the fission axis approximately collinear with the axis of the first scission, and the mass distribution of the fission is asymmetric with the heavier mass emitted preferentially opposite to the direction of the third particle. The high fission probability, the short time-scale, the near collinear orientation and the fission mass asymmetry together present consistent evidence for a new phenomenon of non-equilibrium fission.

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Section: Introductionmentioning

confidence: 74%

Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

et al. 1983

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“…If the spin I is completely aligned along the polar axis (z-axis), W(O, 4~) depends only on the distribution of the projections K of the spin I onto the fission axis [18]. This distribution is assumed to be a Gaussian with variance K~ = Z-~ff, where T is the nuclear temperature and, ~fr the effective moment of inertia at the saddle point [18, 373. In the more general case of incomplete alignment, one can either use a specific (and more or less arbitrary) parametrization describing how the angular momentum is distributed in direction and magnitude [18,[38][39][40], or perform a general multipole expansion of W(O, ~) in spherical harmonics [41].…”

Section: Out-of-plane Distributionmentioning

confidence: 99%

Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A�MeV

Stefanini

Casini

Maurenzig

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. Events with 2, 3 and 4 heavy fragments (A > 20) detected in the reactions ~~176 + l~176 at 18.7, 23.7 A" MeV and ~2~ + ~Z~ at 18.4 A' MeV were analyzed by means of an improved version of the kinematic coincidence method. The phase-space distributions prove that 3-(and possibly 4-) body events predominantly originate from a two-step mechanism and are compatible with the hypothesis of a binary deep-inelastic interaction followed by the further fissionlike decay of one (or both) of the primary fragments. The characteristics of the fission step -mass asymmetry, relative velocity, in-plane and out-of-plane angles -have been reconstructed for the 3-body events and indications are found that nonequilibrium effects at the end of the deep-inelastic phase may influence the fissionlike decay.

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“…The root-mean-square spin values for the heavy fragment, extracted as a function of exit channel charge asymmetry, are shown in ( 10) Here~ J is the moment of inertia of the residual nucleus and is equal to 2/5…”

Section: Resultsmentioning

confidence: 99%

Angular momentum transfer and partition in the deep-inelastic reaction 664 MeV 84Kr + natAg

et al. 1981

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Q- and Z-dependence of angular momentum transfer in deeply inelastic collisions of 86Kr with 209Bi

Cited by 73 publications

References 35 publications

Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

Analysis of the sequential fission observed in collisions of100Mo +100Mo and120Sn +120Sn around 20 A�MeV

Angular momentum transfer and partition in the deep-inelastic reaction 664 MeV 84Kr + natAg

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