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NSR database version of April 27, 2024.

Search: Author = M.Tuttle-Timm

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2019SW04      Phys.Rev. C 100, 034323 (2019)

C.Sword, J.Brett, T.Baumann, B.A.Brown, N.Frank, J.Herman, M.D.Jones, H.Karrick, A.N.Kuchera, M.Thoennessen, J.A.Tostevin, M.Tuttle-Timm, P.A.DeYoung

Observation of three-neutron sequential emission from ²⁵O^*

NUCLEAR REACTIONS ²H(²⁷Ne, 2p)²⁵O^*, E=101.3 MeV/nucleon, [secondary ²⁷Ne beam mixed with other light nuclei from fragmentation of 140 MeV/nucleon ⁴⁸Ca primary beam from the Coupled Cyclotron Facility, and separated by A1900 Fragment Separator at NSCL-MSU]; measured E(n), ²²O fragments, (²²O)n-coin, four-body (²²O+3n), three-body (²²O+2n), and two-body (²²O+1n) ungated and gated decay-energy and hit-multiplicity spectra using the Modular Neutron Array (MoNA) and Large multi-Institutional Scintillator Array (LISA); deduced mass of ²⁵O from the invariant of the sum of the energy-momentum four-vectors of an ²²O fragment and the three associated neutrons emitted from the excited states of ²⁵O. ²⁵O; deduced neutron-unbound levels, resonances, decay via three-neutron sequential emission to levels in ²⁴O, ²³O and ²²O. Comparison with shell-model and eikonal calculations for two-proton removal reaction from ²⁷Ne.

NUCLEAR STRUCTURE ^23,24,25O; calculated levels using Gamow shell model with the density-matrix renormalization-group (GSM-DMRG) method, and a continuum shell model (CSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034323
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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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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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