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NSR database version of April 25, 2024.

Search: Author = K.Hammerton

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2019HA17      Phys.Rev. C 99, 054621 (2019)

K.Hammerton, D.J.Morrissey, Z.Kohley, D.J.Hinde, M.Dasgupta, A.Wakhle, E.Williams, I.P.Carter, K.J.Cook, J.Greene, D.Y.Jeung, D.H.Luong, S.D.McNeil, C.Palshetkar, D.C.Rafferty, C.Simenel, K.Stiefel

Entrance channel effects on the quasifission reaction channel in Cr + W systems

NUCLEAR REACTIONS ¹⁸⁰W(⁵⁰Cr, X)²³⁰Cf^*, E(cm)=210.0 MeV; ¹⁸⁰W(⁵²Cr, X)²³²Cf^*, E(cm)=214.1; ¹⁸⁰W(⁵⁴Cr, X)²³⁴Cf^*, E(cm)=215.4 MeV; ¹⁸²W(⁵⁴Cr, X)²³⁶Cf^*, E(cm)=213.8 MeV; ¹⁸⁴W(⁵²Cr, X)²³⁶Cf^*, E(cm)=209.7 MeV; ¹⁸⁴W(⁵⁴Cr, X)²³⁸Cf^*, E(cm)=211.8 MeV; ¹⁸⁶W(⁵⁰Cr, X)²³⁶Cf^*, E(cm)=201.3 MeV; ¹⁸⁶W(⁵⁴Cr, X)²⁴⁰Cf^*, E(cm)=209.5 MeV; measured fission fragments, mass-angle distributions, mass distribution of fragments using the CUBE detector for charged particle detection at the Heavy Ion Accelerator Facility of the Australian National University; deduced curvature parameter, entrance channel effects, and impact of target deformation effects on the quasifission process.

doi: 10.1103/PhysRevC.99.054621
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2018WA06      Phys.Rev. C 97, 021602 (2018)

A.Wakhle, K.Hammerton, Z.Kohley, D.J.Morrissey, K.Stiefel, J.Yurkon, J.Walshe, K.J.Cook, M.Dasgupta, D.J.Hinde, D.J.Jeung, E.Prasad, D.C.Rafferty, C.Simenel, E.C.Simpson, K.Vo-Phuoc, J.King, W.Loveland, R.Yanez

Capture cross sections for the synthesis of new heavy nuclei using radioactive beams

NUCLEAR REACTIONS ¹⁸¹Ta(³⁹K, X), E=180-210 MeV; ¹⁸¹Ta(⁴⁶K, X), E=190-215 MeV; measured time of flight and relative position of fission fragments, capture-fission σ(E) from a binary event using 14UD Heavy-ion accelerator facility of Australian National University (ANU), and Coupled Cyclotron Facility (CCF) projectile fragmentation facility at NSCL-MSU, and the Coincident Fission Fragment Detector (CFFD) at the ReA3 facility at NSCL; deduced velocity vectors of the coincident fragments, masses and angular distributions of fission fragments. Comparison with several phenomenological models and microscopic time-dependent Hartree-Fock calculations. Discussed implications for the synthesis of heavy nuclei at radioactive beam facilities. ¹⁹⁷Au(³¹Al, X), E(cm), ²⁴⁸Cm(²⁶Mg, X), E(cm)=110-160 MeV; ²⁴⁸Cm(⁴⁸Ca, X), E(cm)=195-230 MeV; ¹⁵⁴Sm(³¹Al, X), E(cm)=125-190 MeV; ²³⁸U(⁴⁸Ca, X), E(cm)=185-235 MeV; ²³⁸U(⁶⁴Ni, X), E(cm)=260-300 MeV; compiled theoretical and experimental values of capture fission σ(E). Comparison with several theoretical results.

doi: 10.1103/PhysRevC.97.021602
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2285.

2017JO06      Phys.Rev. C 95, 044323 (2017), Erratum Phys.Rev. C 96, 059902 (2017)

M.D.Jones, T.Baumann, J.Brett, J.Bullaro, P.A.DeYoung, J.E.Finck, N.Frank, K.Hammerton, J.Hinnefeld, Z.Kohley, A.N.Kuchera, J.Pereira, A.Rabeh, J.K.Smith, A.Spyrou, S.L.Stephenson, K.Stiefel, M.Tuttle-Timm, R.G.T.Zegers, M.Thoennessen

Neutron-unbound excited states of ²³N

NUCLEAR REACTIONS ²H(²⁴O, p)²³N, E=83.4 MeV/nucleon, [secondary ²⁴O beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction at NSCL-MSU accelerator facility]; measured reaction products and identified via ΔE vs. time-of-flight measurement, neutron spectra from the decay of ²³N excited states using MONA and LISA arrays of plastic scintillators; analyzed two-body decay energy spectrum for ²²N+1n. ²³N; deduced levels above S(n), J, π, S(n), S(2n), configurations; calculated levels, J, π using shell-model and several interactions.

doi: 10.1103/PhysRevC.95.044323
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2015HA12      Phys.Rev. C 91, 041602 (2015)

K.Hammerton, Z.Kohley, D.J.Hinde, M.Dasgupta, A.Wakhle, E.Williams, V.E.Oberacker, A.S.Umar, I.P.Carter, K.J.Cook, J.Greene, D.Y.Jeung, D.H.Luong, S.D.McNeil, C.S.Palshetkar, D.C.Rafferty, C.Simenel, K.Stiefel

Reduced quasifission competition in fusion reactions forming neutron-rich heavy elements

NUCLEAR REACTIONS ¹⁸⁰W(⁵⁰Cr, X), E(cm)=222.6 MeV; ¹⁸⁰W(⁵²Cr, X), E(cm)=221.2 MeV; ¹⁸⁰W(⁵⁴Cr, X), E(cm)=219.8 MeV; ¹⁸⁶W(⁵⁰Cr, X), E(cm)=221.0 MeV; ¹⁸⁴W(⁵²Cr, X), E(cm)=220.1 MeV; ¹⁸²W(⁵⁴Cr, X), E(cm)=221.0 MeV; ¹⁸⁴W(⁵⁴Cr, X), E(cm)=218.9 MeV; ¹⁸⁶W(⁵⁴Cr, X), E(cm)=218.3 MeV; measured spectra of neutron-rich fragments from fusion-fission and quasifission in coincidence mode, mass-angle distributions (MADs) using the ANU CUBE detector system at ANU's Heavy-Ion Accelerator Facility; deduced strong dependence on the N/Z of the compound system in quasifission system. Comparison with microscopic time-dependent Hartree-Fock calculations of the quasifission process.

doi: 10.1103/PhysRevC.91.041602
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2015JO14      Phys.Rev. C 92, 051306 (2015)

M.D.Jones, N.Frank, T.Baumann, J.Brett, J.Bullaro, P.A.DeYoung, J.E.Finck, K.Hammerton, J.Hinnefeld, Z.Kohley, A.N.Kuchera, J.Pereira, A.Rabeh, W.F.Rogers, J.K.Smith, A.Spyrou, S.L.Stephenson, K.Stiefel, M.Tuttle-Timm, R.G.T.Zegers, M.Thoennessen

Two-neutron sequential decay of ²⁴O

NUCLEAR REACTIONS ²H(²⁴O, 2n²²O), E=83.4 MeV/nucleon, [²⁴O secondary beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction at NSCL-MSU]; measured charged-particle spectra using position- and energy-sensitive detectors, E(n) and I(n) using MONA-LISA array, three-body decay energy, angular correlations. ²⁴O; deduced level, resonance, l-transfer, width, evidence for two-neutron sequential decay from resonant state. ²³O; deduced intermediate level, J, π through one-neutron decay of ²⁴O resonant state. Comparison with di-neutron and phase-space model calculations for the three-body breakup.

doi: 10.1103/PhysRevC.92.051306
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Data from this article have been entered in the XUNDL database. For more information, click here.

2014ST25      Phys.Rev. C 90, 061605 (2014)

K.Stiefel, Z.Kohley, R.T.deSouza, S.Hudan, K.Hammerton

Symmetry energy dependence of long-timescale isospin transport

NUCLEAR REACTIONS ⁶⁴Zn(⁶⁴Zn, X), E=45 MeV/nucleon; analyzed cos(α) distribution, yield of dinuclear breakup events as function of the time of breakup, correlation between the average breakup time of the dinuclear projectile-like fragments (PLF) and cos(α), average lifetimes extracted from the two-component fit, N/Z distributions. Constrained molecular dynamics (CoMD) model. Detailed comparisons with experimental data from FIRST charged particle array at the Cyclotron Institute of Texas A and M University.

doi: 10.1103/PhysRevC.90.061605
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