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Title: Fusion and quasifission dynamics in the reactions Ca 48 + Bk 249 and Ti 50 + Bk 249 using a time-dependent Hartree-Fock approach

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1286314
Grant/Contract Number:
SC0013847
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Related Information: CHORUS Timestamp: 2016-08-08 18:10:12; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Umar, A. S., Oberacker, V. E., and Simenel, C.. Fusion and quasifission dynamics in the reactions Ca 48 + Bk 249 and Ti 50 + Bk 249 using a time-dependent Hartree-Fock approach. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.94.024605.
Umar, A. S., Oberacker, V. E., & Simenel, C.. Fusion and quasifission dynamics in the reactions Ca 48 + Bk 249 and Ti 50 + Bk 249 using a time-dependent Hartree-Fock approach. United States. doi:10.1103/PhysRevC.94.024605.
Umar, A. S., Oberacker, V. E., and Simenel, C.. Mon . "Fusion and quasifission dynamics in the reactions Ca 48 + Bk 249 and Ti 50 + Bk 249 using a time-dependent Hartree-Fock approach". United States. doi:10.1103/PhysRevC.94.024605.
@article{osti_1286314,
title = {Fusion and quasifission dynamics in the reactions Ca 48 + Bk 249 and Ti 50 + Bk 249 using a time-dependent Hartree-Fock approach},
author = {Umar, A. S. and Oberacker, V. E. and Simenel, C.},
abstractNote = {},
doi = {10.1103/PhysRevC.94.024605},
journal = {Physical Review C},
number = 2,
volume = 94,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 2016},
month = {Mon Aug 08 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.94.024605

Citation Metrics:
Cited by: 13works
Citation information provided by
Web of Science

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  • Excitation functions for shell-stabilized evaporation residues produced in 48 Ca -induced reactions with 154 Gd , 159 Tb , 162 Dy , and 165 Ho targets have been measured in experiments performed at the Cyclotron Institute at Texas A&M University. The examined energy range predominantly covers the 3 n and 4 n evaporation channels with higher cross sections measured for the 4 n products. The σ 4 n are nearly invariant within experimental uncertainty in reactions with 159 Tb , 162 Dy , and 165 Ho with the maxima at 12.6 ± 1.9, 12.6 ± 1.7, and 9.4 ± 1.3more » mb, respectively. For the reaction with 154 Gd , the maximum is slightly lower at 4.0 ± 0.6 mb. A simple model to describe the measured production cross sections was employed. Capture was estimated by using the “diffused barrier formula” from the “fusion by diffusion” model proposed by Swiatecki et al. [Phys. Rev. C 71, 014602 (2005)]. The fusion probability was estimated by using a phenomenological expression presented by Siwek-Wilczynska et al. [Int. J. Mod. Phys. E 17, 12 (2008)]. The survival probability was calculated according to the formula of Vandenbosch and Huizenga [Nuclear Fission (Academic, New York, 1973)], derived from transition-state theory. The best agreement is reached between calculation and experiment upon inclusion of collective effects in the calculation of the survival probability, shown previously to be important for production of weakly deformed nuclei. This, in turn, challenges the expectation that strong shell stabilization benefits the production cross section. The present data are compared with earlier studies on production of neutron-deficient nuclei in Ca-induced reactions with lanthanide targets.« less
  • This manuscript describes a measurement of the Q value for the highly forbidden beta-decays of 50V and the double electron capture decay of 50Cr. The Q value corresponds to the total energy released during the decay and is equivalent to the mass difference between parent and daughter atoms. This mass difference was measured using high precision Penning trap mass spectrometry with the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory. The Q value enters into theoretical calculations of the half-life and beta-decay spectrum for the decay, so improves these calculations. In addition the Q valuemore » corresponds to the end point energy of the beta-decay spectrum, which has been precisely measured for several highly-forbidden decays using modern low background detector techniques. Hence, our Q value measurements provide a test of systematics for these detectors. In addition, we have measured the absolute atomic masses of 46,47,49,50Ti, 50,51V, and 50,52-52Cr, providing improvements in precision by factors of up to 3. These atomic masses help to strengthen global evaluations of all atomic mass data, such as the Atomic Mass Evaluation.« less
  • The Pu 236(n,f), Pu 237(n,f) and Pu 238(n,f) cross sections have been inferred by utilizing the surrogate ratio method. Targets of Pu 239 and U 235 were bombarded with 28.5-MeV protons, and the light ion recoils, as well as fission fragments, were detected using the STARS detector array at the K150 Cyclotron at the Texas A&M cyclotron facility. The (p, tf) reaction on Pu 239 and U 235 targets was used to deduce the σ (Pu 236(n,f))/σ(U 232(n,f)) ratio, and the Pu 236(n,f) cross section was subsequently determined for En=0.5–7.5 MeV. Similarly, the (p,df) reaction on the same two targetsmore » was used to deduce the σ(Pu 237(n,f))/σ(U 233(n,f)) ratio, and the Pu 237(n,f) cross section was extracted in the energy range En=0.5–7 MeV. The Pu 238(n,f) cross section was also deduced by utilizing the (p,p') reaction channel on the same targets. There is good agreement with the recent ENDF/B-VII.1 evaluated cross section data for Pu 238(n,f) in the range En=0.5–10.5 MeV and for Pu 237(n,f) in the range En=0.5–7 MeV; however, the Pu 236(n,f) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.« less