[en] This document describes the input procedures, input data files and operating instructions for the SYVAC A/C 1.03 computer program. SYVAC A/C 1.03 simulates the groundwater mediated movement of radionuclides from underground facilities for the disposal of low and intermediate level wastes to the accessible environment, and provides an estimate of the subsequent radiological risk to man. (author)

[en] This document describes the output data and output files that are produced by the SYVAC A/C 1.03 computer program. It also covers the error messages generated by incorrect input data, and the run classification procedure. SYVAC A/C 1.03 simulates the groundwater mediated movement of radionuclides from underground facilities for the disposal of low and intermediate level wastes to the accessible environment, and provides an estimate of the subsequent radiological risk to man. (author)

[en] The neutron-rich dysprosium isotopes ¹⁶⁸Dy₁₀₂ and ¹⁶⁹Dy₁₀₃ have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For ¹⁶⁸Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched ¹⁷⁰Er target performed at Argonne National Laboratory. This isomer is assigned J^π = K^π = (4¯) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In ¹⁶⁹Dy, the B(E2) value for the transition de-exciting the previously unreported K^π = (1/2¯) isomeric state at 166 keV to the K^π = (1/2¯) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone ¹⁷³Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

[en] Internal conversion coefficients have been measured for transitions following the decay of the 32 μs isomer in the neutron-deficient isotope ¹⁸⁹Pb. The main branch at 337 keV to the 25/2⁺ excited state is shown to be of E3 multipolarity with a strength of about 24 W.u. This, together with multipolarity assignments to other branches, leads to a spin and parity assignment of K^π=31/2^- for the 2435-keV state. This also defines that state as the isomer, rather than the lifetime being due to feeding from a higher lying 33/2⁺ isomeric state as had been proposed previously. The isomer is suggested to arise from the partially aligned coupling of the 11^- two-proton configuration with the i_13/2 neutron hole. The low-lying nature of the 31/2^- multiplet member is attributed to the change in quasiparticle character of the i_13/2 neutron configuration as the neutron shell is depleted

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[en] Incomplete-fusion reactions occur when breakup of the projectile results in only part of the beam particle fusing with the target, the remnant being emitted with an energy equivalent to the beam velocity. Such reactions have been demonstrated to populate slightly neutron-rich nuclei compared to conventional fusion-evaporation reactions, opening possibilities for the study of nuclei along the neutron-rich side of the line of stability. Results from a study of ²¹¹Po are presented to illustrate the use of incomplete-fusion reactions for γ-ray spectroscopy. New results from a test-run which populated high-spin states in ²³⁴U via the ²³²Th(⁹Be,α3n) reaction are also presented. An interesting feature of the latter reaction is that the high fission probabilities for the compound nuclei which follow complete fusion, results in the residues from incomplete fusion forming the dominant residue channels

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[en] The intrinsic quadrupole moment Q₀ of superdeformed rotational bands in A∼150 nuclei depends on the associated single-particle configuration. We have derived an empirical formula based on the additivity of effective quadrupole moments of single-particle orbitals that describes existing measurements from ¹⁴²Sm to ¹⁵²Dy . To further test the formula, the predicted Q₀ moments for two superdeformed bands in ¹⁴⁶Gd of 14.05 eb were confronted with a new measurement yielding 13.9±0.4 eb and 13.9±0.3 eb , respectively. This excellent agreement provides empirical evidence of extreme single-particle behavior in highly deformed, collective systems