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NSR database version of May 24, 2024.

Search: Author = A.Wakhle

Found 25 matches.

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2022HI12      Phys.Rev. C 106, 064614 (2022)

D.J.Hinde, R.du Rietz, D.Y.Jeung, K.J.Cook, M.Dasgupta, E.C.Simpson, R.G.Thomas, M.Evers, C.J.Lin, D.H.Luong, L.R.Gasques, R.Rafiei, A.Wakhle, C.Simenel

Experimental investigation of the role of shell structure in quasifission mass distributions

NUCLEAR REACTIONS 154Sm, 162Dy, 170Er, 174Yb, 186W, 192Os, 196Pt, 200Hg(48Ti, F), E=198-245 MeV; measured reaction products; deduced fission fragment mass-angle distributions, ratio of the fusion-fission yield to the total fission yield, mass-ratio spectra, compound nuclei forming probability. Pointed that with increasing target (or equivalently compound nucleus)atomic number, a rapid transition occurs from dominant fusion-fission to dominantly quasifission. Comparison to GEF calculations. Position-sensitive multiwire proportional counters (MWPCs) at 14UD tandem electrostatic accelerator (Australian National University).

doi: 10.1103/PhysRevC.106.064614
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2022JO04      Phys.Rev. C 106, L011603 (2022)

J.E.Johnstone, V.Singh, R.Giri, S.Hudan, J.Vadas, R.T.deSouza, D.Ackermann, A.Chbihi, Q.Hourdille, A.Abbott, C.Balhoff, A.Hannaman, A.B.McIntosh, M.Sorensen, Z.Tobin, A.Wakhle, S.J.Yennello, M.A.Famiano, K.W.Brown, C.Santamaria, J.Lubian, H.O.Soler, B.V.Carlson

Proton and neutron exchange as a prelude to fusion at near-barrier energies

NUCLEAR REACTIONS 39,41,45,47K(28Si, X), 36,44Ar(28Si, X), E(cm)=34-46 MeV; measured reaction products, evaporation residues; deduced fusion excitation functions, fusion σ(E), potential energy surfaces for binary fragments. Comparison to Dirac-Hartree-Bogoliubov (DHB) calculations for the ground state densities used in Sao Paulo fusion model. Radioactive beams of K and Ar ions were produced by the coupled cyclotron facility at MSU-NSCL and thermalized in a linear gas stopper before being reaccelerated by the ReA3 linac.

doi: 10.1103/PhysRevC.106.L011603
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2021JE02      Phys.Rev. C 103, 034603 (2021)

D.Y.Jeung, D.J.Hinde, E.Williams, M.Dasgupta, E.C.Simpson, R.du Rietz, D.H.Luong, R.Rafiei, M.Evers, I.P.Carter, K.Ramachandran, C.Palshetkar, D.C.Rafferty, C.Simenel, A.Wakhle

Energy dissipation and suppression of capture cross sections in heavy ion reactions

NUCLEAR REACTIONS 232Th(18O, X), (30Si, X), (34S, X), (40Ca, X), E(cm)=145-203 MeV; measured binary reaction products, including pairs of fission fragments, scattered beam particles and recoils in coincidence, and σ(θ) using the CUBE spectrometer at the 14UD tandem accelerator of Australian National University Heavy Ion Accelerator Facility; deduced distributions of the source velocity components of the fissioning nuclei, mass angle distributions (MADs), CC capture cross sections, full momentum transfer (FMT) fission cross sections, ratio of sequential fission to capture-fission, capture barriers. Comparison with coupled-channel (CC) calculations using CCFULL code; discussed sequential and total fission cross sections.

doi: 10.1103/PhysRevC.103.034603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD1001.


2021SI29      Phys.Rev. C 104, L041601 (2021)

V.Singh, J.E.Johnstone, R.Giri, S.Hudan, J.Vadas, R.T.deSouza, D.Ackermann, A.Chbihi, Q.Hourdille, A.Abbott, C.Balhoff, A.Hannaman, A.B.McIntosh, M.Sorensen, Z.Tobin, A.Wakhle, S.J.Yennello, M.A.Famiano, K.W.Brown, C.Santamaria, J.Lubian, H.O.Soler, B.V.Carlson

Impact of shell structure on the fusion of neutron-rich mid-mass nuclei

NUCLEAR REACTIONS 16O(39K, X), (41K, X), (45K, X), (47K, X), (36Ar, X), (44Ar, X), E(cm)=23-33 MeV, [secondary radioactive 45,47K, 44Ar beams from 9Be(48Ca, X), E=140 MeV/nucleon, followed by separation of ions using A1900 at NSCL-MSU facility]; measured reaction products, fusion σ(E); deduced reduced fusion excitation functions; investigated influence of shell effects on fusion of mid-mass nuclei. Comparison of experimental fusion cross sections with Sao Paulo model using Dirac-Hartree-Bogoliubov (DHB) densities, and densities from systematics; deduced over prediction of fusion experimental σ for closed-shell nuclei using DHB densities. 39,41,45,47K, 36,44Ar; predicted DHB density distributions of protons and neutrons. Relevance to importance of understanding shell effects at the saddle point for accurate description of fusion process.

doi: 10.1103/PhysRevC.104.L041601
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2698.


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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2019MA72      Phys.Rev. C 100, 044612 (2019)

A.Rodriguez Manso, A.B.McIntosh, J.Gauthier, K.Hagel, L.Heilborn, A.Jedele, Z.Kohley, A.Wakhle, A.Zarrella, S.J.Yennello

Dynamical ternary decays of excited projectile-like fragments

NUCLEAR REACTIONS 70Zn(70Zn, X), E=35 MeV/nucleon; measured reaction products using 4π charged-particle array NIMROD at the K500 Cyclotron at Texas A and M University; deduced normalized yields of fragments as function of Z, Dalitz plot for fragment sizing correlation, normalized velocity distributions and normalized angular distributions of fragments for the different rupture scenarios, correlation between the angles of the first and second breaks for each rupture scenario, and angular correlation between the relative velocities of fragments; investigated neutron-proton equilibration in dynamically deformed nuclear systems by analyzing composition of fragments produced from the projectile-like fragments (PLF*) in semiperipheral collisions.

doi: 10.1103/PhysRevC.100.044612
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2018HI02      Phys.Rev. C 97, 024616 (2018)

D.J.Hinde, D.Y.Jeung, E.Prasad, A.Wakhle, M.Dasgupta, M.Evers, D.H.Luong, R.du Rietz, C.Simenel, E.C.Simpson, E.Williams

Sub-barrier quasifission in heavy element formation reactions with deformed actinide target nuclei

NUCLEAR REACTIONS 232Th(34S, X)266Sg*, E(cm)=143.6, 145.7, 147.9, 150.5, 158.4, 166.7 MeV; 238U(28Si, X)266Sg*, E(cm)=126.9, 129.5, 137.4, 145.7, 151.0, 155.5 MeV; 232Th(30Si, X)262Rf*, E(cm)=128.2, 131.8, 135.9, 139.5, 143.1, 146.7 MeV; 238U(24Mg, X)262Rf*, E(cm)=110.0, 113.2, 116.4, 120.0, 126.3, 129.5 MeV; measured reaction products, fission and quasifission mass and angle distributions (MADs); 232Th(19F, X), E=76.4, 78.3, 80.1, 82.0, 83.8, 85.7, 87.6, 89.4, 91.2, 93.1, 95.0, 96.8, 98.6, 100.5, 102.4, 107.0 MeV; 232Th(32S, X), (19F, X), (16O, X), (12C, X), (11B, X), E/VB=0.8-1.3; 238U(16O, X), (12C, X), (11B, X), E/VB=0.8-1.3; measured angular distribution of mass-symmetric fission events, σ(E) for full momentum transfer (FMT) fission for 19F+232Th reaction. Experiments used CUBE fission spectrometer at the Australian National University 14UD tandem accelerator facility to determine the probabilities of fast and slow quasifission in reactions with prolate deformed actinide nuclei. Relevance to formation of superheavy elements (SHEs) by fusion of two massive nuclei.

doi: 10.1103/PhysRevC.97.024616
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2018KH05      Phys.Rev. C 97, 064618 (2018)

J.Khuyagbaatar, H.M.David, D.J.Hinde, I.P.Carter, K.J.Cook, M.Dasgupta, Ch.E.Dullmann, D.Y.Jeung, B.Kindler, B.Lommel, D.H.Luong, E.Prasad, D.C.Rafferty, C.Sengupta, C.Simenel, E.C.Simpson, J.F.Smith, K.Vo-Phuoc, J.Walshe, A.Wakhle, E.Williams, A.Yakushev

Nuclear structure dependence of fusion hindrance in heavy element synthesis

NUCLEAR REACTIONS 204,208Pb(48Ti, X), E=240.0, 245.0, 252.2, 259.0, 270.0, 280.0 MeV; 206,208Pb(50Ti, X), E=236.0, 240.0, 252.0, 258.0, 264.0, 270.0, 280.2 MeV; measured reaction products, mass ratio and angular distributions (MAD) of fragments, double differential σ(θ, MR), and widths using CUBE detector array at the Heavy Ion Accelerator Facility of Australian National University. 206Pb(36S, X), (34S, X), (48Ti, X), (50Ti, X), E*=25-60 MeV; calculated mean-squared angular momenta, widths and MR distributions, and compared with experimental data. Discussed impact of nuclear structure on fusion-evaporation reactions.

doi: 10.1103/PhysRevC.97.064618
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2018MA62      Phys.Rev. C 98, 044602 (2018)

L.W.May, A.Wakhle, A.B.McIntosh, Z.Kohley, S.Behling, A.Bonasera, G.Bonasera, P.Cammarata, K.Hagel, L.Heilborn, A.Jedele, A.Raphelt, A.Rodriguez Manso, G.Souliotis, R.Tripathi, M.D.Youngs, A.Zarrella, S.J.Yennello

Neutron-proton equilibration in 35 MeV/υ collisions of 64, 70Zn + 64, 70Zn and 64Zn, 64Ni + 64Zn, 64Ni quantified using triplicate probes

NUCLEAR REACTIONS 64,70Zn(70Zn, X), (64Zn, X), 64Zn, 64Ni(64Zn, X), (64Ni, X), E=35 MeV/nucleon; measured reaction products, isobaric yield ratios, isospin transport ratios of quasiparticle fragments using 4π NIMROD array for fragment detection at K150 cyclotron facility of Texas A and M University; deduced fractional neutron-proton equilibration width, quasiprojectile asymmetry, isoscaling parameter. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.98.044602
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2018MO13      Phys.Rev. C 97, 054603 (2018)

G.Mohanto, D.J.Hinde, K.Banerjee, M.Dasgupta, D.Y.Jeung, C.Simenel, E.C.Simpson, A.Wakhle, E.Williams, I.P.Carter, K.J.Cook, D.H.Luong, C.S.Palshetkar, D.C.Rafferty

Interplay of spherical closed shells and N/Z asymmetry in quasifission dynamics

NUCLEAR REACTIONS 208Pb(50Cr, X)258Sg*,208Pb(52Cr, X)260Sg*,208Pb(54Cr, X)262Sg*,206Pb(52Cr, X)258Sg*,204Pb(54Cr, X), 258Sg*, E=257-292.7 MeV; measured fission fragments, two fission fragments in coincidence mode, and mass angle distributions (MADs) using CUBE spectrometer at the Australian National University 14 UD tandem accelerator facility; deduced mass-ratio distributions of fission fragments, symmetric-peaked fission to total fission ratio, symmetric fission as a function of entrance channel magicity, effect of entrance-channel spherical closed shells and N/Z asymmetry on quasifission dynamics. Relevance to synthesis of superheavy-elements.

doi: 10.1103/PhysRevC.97.054603
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2018PA48      Phys.Rev. C 98, 044603 (2018)

C.S.Palshetkar, D.J.Hinde, M.Dasgupta, E.Williams, K.Ramachandran, I.P.Carter, K.J.Cook, D.Y.Jeung, D.H.Luong, S.D.McNeil, D.C.Rafferty, A.Wakhle

Fission cross sections as a probe of fusion dynamics at high angular momentum

NUCLEAR REACTIONS 148Sm(16O, X)164Yb*, E(cm)=73.92, 82.04, 90.21, 99.24 MeV; 136Ba(28Si, X)164Yb*, E(cm)=108.22, 116.38, 119.07, 125.42 MeV; 124Sn(40Ca, X)164Yb*, E(cm)=126.00, 130.11, 139.19, 144.07 MeV; measured angular distributions and mass-angle distributions (MADs) of fission fragments using CUBE spectrometer at the 14UD tandem accelerator at the Australian National University; deduced fission σ(E) of excited compound nuclei with coupled channel analysis for angular momentum distributions. Comparison with previous experimental fusion and fission σ(E), and with statistical model calculations. Discussed fission cross-section as a sensitive probe of fusion dynamics at high angular momentum.

doi: 10.1103/PhysRevC.98.044603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0921.


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.


2018WI01      Phys.Rev.Lett. 120, 022501 (2018)

E.Williams, K.Sekizawa, D.J.Hinde, C.Simenel, M.Dasgupta, I.P.Carter, K.J.Cook, D.Y.Jeung, S.D.McNeil, C.S.Palshetkar, D.C.Rafferty, K.Ramachandran, A.Wakhle

Exploring Zeptosecond Quantum Equilibration Dynamics: From Deep-Inelastic to Fusion-Fission Outcomes in 58Ni + 60Ni Reactions

NUCLEAR REACTIONS 58,60Ni(58Ni, X), E=158.4 MeV; measured reaction products; deduced σ, σ(θ, E). Comparison with theoretical predictions using time dependent Hartree-Fock and time dependent random phase approximation approaches, which, respectively, incorporate one-body energy dissipation and fluctuations.

doi: 10.1103/PhysRevLett.120.022501
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2017PR07      Phys.Rev. C 96, 034608 (2017)

E.Prasad, D.J.Hinde, E.Williams, M.Dasgupta, I.P.Carter, K.J.Cook, D.Y.Jeung, D.H.Luong, C.S.Palshetkar, D.C.Rafferty, K.Ramachandran, C.Simenel, A.Wakhle

Fusion and quasifission studies for the 40Ca + 186W, 192Os reactions

NUCLEAR REACTIONS 186W(40Ca, X)226Pu*, E=199.3, 204.3, 214.3, 225.4 MeV; 192Os(40Ca, X)232Cm*, E=199.3, 204.3, 214.3, 225.3, 239.8, 262.6 MeV; measured mass-angle distributions (MADs) of the fragments, differential σ(θ, E), total fusion σ(E) using the CUBE spectrometer at the Heavy Ion Accelerator Facility of the Australian National University; deduced fragment mass ratio σ(MR), potential parameters from Coupled-channels calculations, Coulomb barriers as a function of orientation angles, parameters of the sticking-time distribution and average sticking time for quasifission components. Comparison with theoretical calculations using classical phenomenological approach by GEneral description of Fission observables (GEF) model. Relevance to quasifission and fusion-fission processes in the production of superheavy elements (SHE).

doi: 10.1103/PhysRevC.96.034608
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0932.


2016LI42      Phys.Rev. C 94, 024616 (2016)

J.F.Liang, J.M.Allmond, C.J.Gross, P.E.Mueller, D.Shapira, R.L.Varner, M.Dasgupta, D.J.Hinde, C.Simenel, E.Williams, K.Vo-Phuoc, M.L.Brown, I.P.Carter, M.Evers, D.H.Luong, T.Ebadi, A.Wakhle

Examining the role of transfer coupling in sub-barrier fusion of 46, 50Ti + 124Sn

NUCLEAR REACTIONS 46,50Ti(124Sn, X), E(cm)=120-154 MeV; 124Sn(46Ti, X), (50Ti, X), E(cm)=116-140 MeV; measured evaporation residues (ERs), fusion σ(E) for the 124Sn beam at HRIBF-ORNL facility, and 46,50Ti beams at ANU 14UD tandem accelerator facility. Comparison of experimental reduced σ(E) values and reduced barrier distributions for 40,48Ca+96Zr, 40,48Ca+124Sn, 40,48Ca+132Sn, 46,50Ti+124Sn, 58,64Ni+124Sn 58,64Ni+132Sn and 64Ni+118Sn reactions. Comparison with coupled-channel calculations using CCFULL code.

doi: 10.1103/PhysRevC.94.024616
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2240.


2016PR03      Phys.Rev. C 93, 024607 (2016)

E.Prasad, A.Wakhle, D.J.Hinde, E.Williams, M.Dasgupta, M.Evers, D.H.Luong, G.Mohanto, C.Simenel, K.Vo-Phuoc

Exploring quasifission characteristics for 34S + 232Th forming 266Sg

NUCLEAR REACTIONS 232Th(32S, X)266Sg*, E=164.7, 167.2, 169.7, 172.7, 181.6, 191.2 MeV; measured reaction products, fission events, unsymmetrized distribution of fragments, average mass ratio of heavy asymmetric fragments to symmetric fragments as function of E/VB, angular momentum-distributions, fragment-fragment mass angle distribution (MAD) plots, mass drift as function of time. Monte Carlo simulations for mass angle distribution (MAD) plots.

doi: 10.1103/PhysRevC.93.024607
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2016RA26      Phys.Rev. C 94, 024607 (2016)

D.C.Rafferty, M.Dasgupta, D.J.Hinde, C.Simenel, E.C.Simpson, E.Williams, I.P.Carter, K.J.Cook, D.H.Luong, S.D.McNeil, K.Ramachandran, K.Vo-Phuoc, A.Wakhle

Multinucleon transfer in 16, 18O, 19F + 208Pb reactions at energies near the fusion barrier

NUCLEAR REACTIONS 208Pb(16O, X)12C/13C/14C/13N/14N/15N/14O/15O/17O/18O/17F, E(cm)=73.0, 72.5, 70.9, 69.3; 208Pb(18O, X)11B/12C/13C/14C/15C/16C/15N/16N/17N/16O/17O/19O/19F, E(cm)=73.6, 71.6, 71.1, 70.3, 69.6, 68.0 MeV; 208Pb(19F, X)12C/13C/14C/15N/16N/17N/16O/17O/18O/18F/20F/21F/20Ne/21Ne/22Ne, E(cm)=83.3, 81.3, 80.6, 78.9, 77.2, 75.5, 74.1 MeV; measured projectile-like fragments (PLFs) produced in +1p, +2n, +1n, -1n, -2n, -1p, -1p1n, -1p2n, -2p, -2p1n, -2p2n, -2p3n, -2p4n, -3p4n, +1p2n, +1p1n, +2n, -3p2n and -3p3n transfer channels, ΔE-E spectra, probabilities for various transfer processes, ratios of quasielastic and Rutherford scattering cross sections, distribution of excitation energies at ANU Heavy Ion accelerator facility.

doi: 10.1103/PhysRevC.94.024607
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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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2015KH03      Phys.Rev. C 91, 054608 (2015)

J.Khuyagbaatar, D.J.Hinde, I.P.Carter, M.Dasgupta, Ch.E.Dullmann, M.Evers, D.H.Luong, R.du Rietz, A.Wakhle, E.Williams, A.Yakushev

Experimental study of the quasifission, fusion-fission, and de-excitation of Cf compound nuclei

NUCLEAR REACTIONS 206Pb(36S, X)242Cf*, 208Pb(34S, X)242Cf*, 198Pt(44Ca, X)242Cf*, 208Pb(36S, X)244Cf*, 235U(12C, X)247Cf*, at E*=28-52 MeV; measured fission fragment spectra, (fragment)(fragment)-coin, mass and angle distributions of fission fragments at Heavy Ion Accelerator Facility of the Australian National University; deduced mean squared angular momenta, (σRMSgaus), mass distribution of fission fragments of 244Cf* and 242Cf* following electron capture decay of 244Es and 242Es; deduced fractions of the mass asymmetric fission components, survival probabilities, shell effects in slow quasifission mass distributions. Coupled-channel calculations using CCFULL computer code. Comparison with calculations using general fission model computer code GEF.

doi: 10.1103/PhysRevC.91.054608
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2015PR07      Phys.Rev. C 91, 064605 (2015)

E.Prasad, D.J.Hinde, K.Ramachandran, E.Williams, M.Dasgupta, I.P.Carter, K.J.Cook, D.Y.Jeung, D.H.Luong, S.McNeil, C.S.Palshetkar, D.C.Rafferty, C.Simenel, A.Wakhle, J.Khuyagbaatar, Ch.E.Dullmann, B.Lommel, B.Kindler

Observation of mass-asymmetric fission of mercury nuclei in heavy ion fusion

NUCLEAR REACTIONS 142Nd(40Ca, X)182Hg*, E=167.7, 194.9, 199.9, 210.0, 221.1 MeV; 182W(13C, X)195Hg*, E=60.0, 63.0, 66.0 MeV; measured fission fragments mass rations and mass-angle distributions using the CUBE spectrometer at 14UD Pelletron facility of ANU-Canberra; deduced mass-asymmetric fission of 182Hg compound nucleus at E*=33.6 MeV, and mass-symmetric fission of 195Hg compound nucleus at all energies.Kinematic reconstruction method. Comparison with results from mass-asymmetric fission of 180Hg in beta-delayed fission process, and with theoretical predictions.

doi: 10.1103/PhysRevC.91.064605
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2014WA41      Phys.Rev.Lett. 113, 182502 (2014)

A.Wakhle, C.Simenel, D.J.Hinde, M.Dasgupta, M.Evers, D.H.Luong, R.du Rietz, E.Williams

Interplay between Quantum Shells and Orientation in Quasifission

NUCLEAR REACTIONS 238U(40Ca, X), E=225.4 MeV; measured reaction products, fission fragments; deduced fragment yields, mass-angle distribution σ(θ). Comparison with microscopic quantum calculations.

doi: 10.1103/PhysRevLett.113.182502
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2013DU17      Phys.Rev. C 88, 054618 (2013)

R.du Rietz, E.Williams, D.J.Hinde, M.Dasgupta, M.Evers, C.J.Lin, D.H.Luong, C.Simenel, A.Wakhle

Mapping quasifission characteristics and timescales in heavy element formation reactions

NUCLEAR REACTIONS 186W(16O, X)202Pb*, E(cm)=102.1 MeV; 192Os(16O, X)208Po*, E(cm)=102.3 MeV; 178Hf(24Mg, X)202Po*, E(cm)=102.1 MeV; 168Er(34S, X)202Po*, E(cm)=128.4 MeV; 144Sm(48Ti, X)192Po*, E(cm)=164.2 MeV; 196Pt(16O, X)212Rn*, E(cm)=102.0 MeV; 208Pb(12C, X)220Ra*, E(cm)=59.9 MeV; 200Hg(16O, X)216Ra*, E(cm)=102.8 MeV; 178Hf(32S, X)210Ra*, E(cm)=138.3 MeV; 162Dy(48Ti, X)210Ra*, E(cm)=168.9 MeV; 208Pb(16O, X)224Th*, E(cm)=103.0 MeV; 186W(34S, X)220Th*, E(cm)=144.5 MeV; 170Er(48Ti, X)218Th*, E(cm)=174.8 MeV; 154Sm(64Ni, X)218Th*, E(cm)=200.6 MeV; 174Yb(48Ti, X)222U*, E(cm)=178.1 MeV; 194Pt(32S, X)226Pu*, E(cm)=144.4 MeV; 178Hf(48Ti, X)226Pu*, E(cm)=180.8 MeV; 208Pb(30Si, X)238Cm*, E(cm)=134.7 MeV; 202Hg(32S, X)234Cm*, E(cm)=149.6 MeV; 186W(48Ti, X)234Cm*, E(cm)=186.3 MeV; 170Er(64Ni, X)234Cm*, E(cm)=216.2 MeV; 238U(12C, X)250Cf*, E(cm)=66.3 MeV; 232Th(18O, X)250Cf*, E(cm)=84.9 MeV; 208Pb(32S, X)240Cf*, E(cm)=149.9 MeV; 198Pt(40Ca, X)238Cf*, E(cm)=188.7 MeV; 192Os(48Ti, X)240Cf*, E(cm)=195.0 MeV; 238U(16O, X)254Fm*, E(cm)=103.5 MeV; 196Pt(48Ti, X)244Fm*, E(cm)=193.3 MeV; 208Pb(40Ca, X)248No*, E(cm)=190.2 MeV; 200Hg(48Ti, X)248No*, E(cm)=197.5 MeV; 184W(64Ni, X)248No*, E(cm)=252.3 MeV; 238U(24Mg, X)262Rf*, E(cm)=129.3 MeV; 232Th(30Si, X)262Rf*, E(cm)=144.0 MeV; 208Pb(48Ti, X)256Rf*, E(cm)=210.6 MeV; 192Os(64Ni, X)256Rf*, E(cm)=239.2 MeV; 238U(28Si, X)266Sg*, E(cm)=150.7 MeV; 232Th(34S, X)266Sg*, E(cm)=166.7 MeV; 198Pt(64Ni, X)262Sg*, E(cm)=241.7 MeV; 232Th(40Ca, X)272Ds*, E(cm)=211.5 MeV; 208Pb(64Ni, X)272Ds*, E(cm)=259.5 MeV; 238U(40Ca, X)278Cn*, E(cm)=210.7 MeV; 238U(48Ti, X)286Fl*, E(cm)=214.6 MeV; measured reaction products using CUBE spectrometer of multiwire proportional counters (MWPCs), mass-angle distributions (MAD) at ANU's Heavy Ion accelerator facility; deduced systematic dependence of quasifission characteristics as a function of identity of colliding nuclei, entrance channel and compound nucleus fissilities, effects of nuclear structure at lower beam energies. Relevance to formation of superheavy elements.

doi: 10.1103/PhysRevC.88.054618
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2013WI05      Phys.Rev. C 88, 034611 (2013)

E.Williams, D.J.Hinde, M.Dasgupta, R.du Rietz, I.P.Carter, M.Evers, D.H.Luong, S.D.McNeil, D.C.Rafferty, K.Ramachandran, A.Wakhle

Evolution of signatures of quasifission in reactions forming curium

NUCLEAR REACTIONS 232Th(12C, X)244Cm*, E=61-94 MeV; 208Pb(28Si, X)236Cm*, E=138-188 MeV; 206Pb(30Si, X)236Cm*, E=135-198 MeV; 208Pb(30Si, X)238Cm*, E=154-167 MeV; 202Hg(32S, X)234Cm*, E=157-191 MeV; 186W(48Ti, X)234Cm*, E=219-235 MeV; 170Er(64Ni, X)234Cm*, E=280-318 MeV; measured particle spectra, fusion σ(E), angular anisotropies using CUBE detector at Heavy-ion ANU facility; deduced mass-ratio spectra and widths, mass-angle distributions (MAD) as signatures of two-body quasifission. Comparison with Transition-state model and coupled-channel calculations.

doi: 10.1103/PhysRevC.88.034611
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2011CH23      Phys.Rev. C 83, 054318 (2011)

S.K.Chamoli, A.E.Stuchbery, S.Frauendorf, J.Sun, Y.Gu, R.F.Leslie, P.T.Moore, A.Wakhle, M.C.East, T.Kibedi, A.N.Wilson

Measured g factors and the tidal-wave description of transitional nuclei near A = 100

NUCLEAR REACTIONS 110,112,114,116Cd, 100,102,104Ru(32S, 32S'), E=95 MeV; 12C(96Ru, 96Ru'), (98Ru, 98Ru'), (100Ru, 100Ru'), (102Ru, 102Ru'), (104Ru, 104Ru'), (102Pd, 102Pd'), (104Pd, 104Pd'), (106Pd, 106Pd'), (108Pd, 108Pd'), (110Pd, 110Pd'), (106Cd, 106Cd'), (108Cd, 108Cd'), (112Cd, 112Cd'), (114Cd, 114Cd'), E=230, 240, 245, 260 MeV; 26Mg(98Mo, 98Mo'), (96Ru, 96Ru'), (100Ru, 100Ru'), (102Ru, 102Ru'), (104Ru, 104Ru'), (106Pd, 106Pd'), E=240 MeV; measured Eγ, Iγ, particle spectra, γ-particle-coin, angular correlations, precession frequency; deduced g factors.

NUCLEAR MOMENTS 98Mo, 106,108,112,114Cd, 96,98,100,102,104Ru, 106,108,110,112,114,116Cd, 102,104,106,108,110Pd; measured g factors using transient-field technique in inverse and conventional kinematics. Comparison with tidal-wave version of the cranking model for transitional nuclei. Systematics of g factors and deformation parameters for even-even Mo (A=92-108), Ru (A=96-112), Pd (A=102-116), and Cd (A=104-118) nuclei.

doi: 10.1103/PhysRevC.83.054318
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2011DU02      Phys.Rev.Lett. 106, 052701 (2011)

R.du Rietz, D.J.Hinde, M.Dasgupta, R.G.Thomas, L.R.Gasques, M.Evers, N.Lobanov, A.Wakhle

Predominant Time Scales in Fission Processes in Reactions of S, Ti and Ni with W: Zeptosecond versus Attosecond

NUCLEAR REACTIONS 184W(64Ni, F), E=310-341 MeV; 186W(48Ti, F), E= 220-260 MeV; 186W(34S, F), E=149-189 MeV; measured quasifission products; deduced mass-angle distributions, time scale differences. Comparison with CCFULL calculations.

doi: 10.1103/PhysRevLett.106.052701
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