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Search: Author = J.Snyder

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2020SN01 Sci. Rep. 10, 18245 (2020)

J.Snyder, J.Morrison, S.Feister, K.Frische, K.George, M.Le, C.Orban, G.Ngirmang, E.Chowdhury, W.Roquemore

Background pressure effects on MeV protons accelerated via relativistically intense laser-plasma interactions

doi: 10.1038/s41598-020-75061-1
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2015JO05 Phys.Rev. C 91, 044312 (2015)

M.D.Jones, Z.Kohley, T.Baumann, G.Christian, P.A.DeYoung, J.E.Finck, N.Frank, R.A.Haring-Kaye, A.N.Kuchera, B.Luther, S.Mosby, J.K.Smith, J.Snyder, A.Spyrou, S.L.Stephenson, M.Thoennessen

Further insights into the reaction ¹⁴Be(CH₂, X)¹⁰He

NUCLEAR REACTIONS ²H(¹⁴Be, ¹⁰He), (¹⁴Be, ¹²He), E=59 MeV/nucleon, [¹⁴Be secondary beam from ⁹Be(¹⁸O, X), E=120 MeV/nucleon primary reaction using A1900 fragment separator]; measured particle spectra by ΔE-E detectors and neutron spectra by MONA array at NSCL-MSU facility; analyzed decay energy spectra and multiplicity distributions for ⁸He+n, ⁸He+2n ⁸He+4n, and ⁸He+2n with α removal. ¹⁰He; deduced resonance, no evidence for initial state effects based on the halo structure of the initial ¹⁴Be assuming a direct α-particle removal reaction. ¹²He; deduced no evidence for the existence of a low-lying (≤1 MeV) resonance in ¹²He.

doi: 10.1103/PhysRevC.91.044312
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2015RO16 Phys.Rev. C 92, 034316 (2015)

W.F.Rogers, S.Garrett, A.Grovom, R.E.Anthony, A.Aulie, A.Barker, T.Baumann, J.J.Brett, J.Brown, G.Christian, P.A.DeYoung, J.E.Finck, N.Frank, A.Hamann, R.A.Haring-Kaye, J.Hinnefeld, A.R.Howe, N.T.Islam, M.D.Jones, A.N.Kuchera, J.Kwiatkowski, E.M.Lunderberg, B.Luther, D.A.Meyer, S.Mosby, A.Palmisano, R.Parkhurst, A.Peters, J.Smith, J.Snyder, A.Spyrou, S.L.Stephenson, M.Strongman, B.Sutherland, N.E.Taylor, M.Thoennessen

Unbound excited states of the N=16 closed shell nucleus ²⁴O

NUCLEAR REACTIONS ⁹Be(²⁶F, ²⁴O), E=76 MeV/nucleon, [secondary ²⁶F beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction]; measured charged-particle spectra, E(n), I(n), (²³O)n-coin using MONA-LISA array at NSCL-MSU. ²⁴O; deduced decay energy spectrum, levels, J, π, difference between the first 2+ and 1+ states. Comparison with previous experimental results and theoretical calculations.

doi: 10.1103/PhysRevC.92.034316
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2014RE12 Phys.Rev. C 90, 044318 (2014)

W.Reviol, R.V.F.Janssens, S.Frauendorf, D.G.Sarantites, M.P.Carpenter, X.Chen, C.J.Chiara, D.J.Hartley, K.Hauschild, T.Lauritsen, A.Lopez-Martens, M.Montero, O.L.Pechenaya, D.Seweryniak, J.B.Snyder, S.Zhu

Characterization of octupole-type structures in ²²¹Th

NUCLEAR REACTIONS ²⁰⁷Pb(¹⁸O, 4n), E=96 MeV; measured Eγ, Iγ, γγ-, (evaporation residues)γ-coin, γ(θ) using Gammasphere and HERCULES detector arrays at ATLAS-ANL facility. ²²¹Th; deduced high-spin levels, J, π, multipolarity, mixing ratio, bands, alternating-parity sequences and multiple octupole structures, B(E1)/B(E2) and B(M1)/B(E2) ratios, alignment plots. Systematics of octupole structures, parity splitting, and other properties in ^{218,219,220,221,222}Ra, ^{219,220,221,222,223,224}Th.

doi: 10.1103/PhysRevC.90.044318
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2014SM03 Phys.Rev. C 90, 024309 (2014)

J.K.Smith, T.Baumann, D.Bazin, J.Brown, S.Casarotto, P.A.DeYoung, N.Frank, J.Hinnefeld, M.Hoffman, M.D.Jones, Z.Kohley, B.Luther, B.Marks, N.Smith, J.Snyder, A.Spyrou, S.L.Stephenson, M.Thoennessen, N.Viscariello, S.J.Williams

Low-lying neutron unbound states in ¹²Be

NUCLEAR REACTIONS ⁹Be(¹³B, ¹²Be), E=71 MeV/nucleon, [secondary ¹³B beam from ⁹Be(¹⁸O, X), E=120 MeV/nucleon primary reaction; measured particle and neutron spectra, (¹²Be)n-, (¹¹Be)2n-coin using A1900 fragment separator and MoNA-LISA array for neutron and fragment detection at NSCL-MSU facility. ¹²Be; deduced decay energy, level energy, resonance, L-value, J, π, width, one-neutron decay, no evidence for the 2n-decay channel to ¹⁰Be. Comparison with previous experimental results, and with continuum shell model calculation.

doi: 10.1103/PhysRevC.90.024309
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2013CH19 Phys.Rev. C 87, 044305 (2013)

X.Chen, D.G.Sarantites, W.Reviol, J.Snyder

Time-dependent Monte Carlo calculations of recoil-in-vacuum g-factor data for ^{122, 126, 130, 132}Te

NUCLEAR MOMENTS ^{122,126,130,132}Te; calculated charge-state distributions of atomic states, attenuation coefficients G_k versus g factor distributions for recoil-in vacuum (RIV) methods. Monte Carlo simulations based on time-dependent attenuation using GRASP2K computer for excited atomic states; deduced g factors of first 2+ states. Comparison of deduced g factors with previous experimental values, and with various nuclear-model calculations.

doi: 10.1103/PhysRevC.87.044305
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2013KO03 Phys.Rev. C 87, 011304 (2013)

Z.Kohley, E.Lunderberg, P.A.DeYoung, A.Volya, T.Baumann, D.Bazin, G.Christian, N.L.Cooper, N.Frank, A.Gade, C.Hall, J.Hinnefeld, B.Luther, S.Mosby, W.A.Peters, J.K.Smith, J.Snyder, A.Spyrou, M.Thoennessen

First observation of the ¹³Li ground state

NUCLEAR REACTIONS ⁹Be(¹⁴Be, ¹³Li), [¹⁴Be secondary beam from ⁹Be(¹⁸O, X), E=120 MeV/nucleon primary beam], E=53.6 MeV/nucleon; measured ¹¹Li fragment and neutron spectra, three-body (¹¹Li+n+n), and two-body (¹¹Li+n) decay energy spectra using Modular Neutron Array (MONA) for neutrons at NSCL facility. Monte Carlo and GEANT4 simulations. Glauber reaction model. ^12,13Li; deduced levels, ground state resonance energies. Strong dineutron character for ¹³Li g.s. Comparison with previous studies.

doi: 10.1103/PhysRevC.87.011304
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2013KO10 Phys.Rev.Lett. 110, 152501 (2013)

Z.Kohley, T.Baumann, D.Bazin, G.Christian, P.A.DeYoung, J.E.Finck, N.Frank, M.Jones, E.Lunderberg, B.Luther, S.Mosby, T.Nagi, J.K.Smith, J.Snyder, A.Spyrou, M.Thoennessen

Study of Two-Neutron Radioactivity in the Decay of ²⁶O

RADIOACTIVITY ²⁶O(2n) [from ⁹Be(²⁷F, p), E=82 MeV/nucleon]; measured decay products, En, In; deduced T_1/2. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.110.152501
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2013KO28 Phys.Rev. C 88, 041601 (2013)

Z.Kohley, G.Christian, T.Baumann, P.A.DeYoung, J.E.Finck, N.Frank, M.Jones, J.K.Smith, J.Snyder, A.Spyrou, M.Thoennessen

Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy

NUCLEAR REACTIONS ⁹Be(³²Mg, X), [secondary ³²Mg beam from Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction], E=73 MeV/nucleon; measured neutron spectra by MoNA array and particle spectra by 4 Tm Sweeper magnet, (particle)n-coin at yield of fragments at NSCL, MSU facility; deduced average N/Z vs Z, multiplicity, velocity distribution, density dependence of the symmetry energy by comparison of the experimental data with the constrained molecular dynamics model (CoMD) constraints.

doi: 10.1103/PhysRevC.88.041601
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2013MO12 Nucl.Phys. A909, 69 (2013)

S.Mosby, N.S.Badger, T.Baumann, D.Bazin, M.Bennett, J.Brown, G.Christian, P.A.DeYoung, J.E.Finck, M.Gardner, J.D.Hinnefeld, E.A.Hook, E.M.Lunderberg, B.Luther, D.A.Meyer, M.Mosby, G.F.Peaslee, W.F.Rogers, J.K.Smith, J.Snyder, A.Spyrou, M.J.Strongman, M.Thoennessen

Search for ²¹C and constraints on ²²C

NUCLEAR REACTIONS ⁹Be(²²C, n²¹C), E=68 MeV/nucleon; measured En, In(\theta), E(²⁰C fragment), I(²⁰C fragment, \theta). ^21,22C calculated double neutron halo nucleus low-lying levels, J, π, spectrometric factor using shell model, Goldhaber model with friction term. ²¹C deduced non-existence of bound state. ²⁰C+n deduced scattering length.

doi: 10.1016/j.nuclphysa.2013.04.004
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2013SN01 Phys.Lett. B 723, 61 (2013)

J.B.Snyder, W.Reviol, D.G.Sarantites, A.V.Afanasjev, R.V.F.Janssens, H.Abusara, M.P.Carpenter, X.Chen, C.J.Chiara, J.P.Greene, T.Lauritsen, E.A.McCutchan, D.Seweryniak, S.Zhu

High-spin transition quadrupole moments in neutron-rich Mo and Ru nuclei: Testing γ softness?

RADIOACTIVITY ²⁵²Cf(SF); measured decay products, Eγ, Iγ. ^{102,104,106,108}Mo, ^108,110,112Ru; deduced energy levels, J, π, kinematic and dynamic moments of inertia, B(E2), transition quadrupole moments, potential energy surfaces. Comparison with available data.

doi: 10.1016/j.physletb.2013.04.046
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2013SN02 Phys.Rev. C 88, 031303 (2013)

J.Snyder, T.Baumann, G.Christian, R.A.Haring-Kaye, P.A.DeYoung, Z.Kohley, B.Luther, M.Mosby, S.Mosby, A.Simon, J.K.Smith, A.Spyrou, S.Stephenson, M.Thoennessen

First observation of ¹⁵Be

NUCLEAR REACTIONS ²H(¹⁴Be, ¹⁵Be), E=59 MeV/nucleon, [secondary ¹⁴Be from ⁹Be(¹⁸O, X), E=120 MeV/nucleon primary reaction]; measured ¹⁴Be, and neutron spectra from decay of ¹⁵Be, TOF, production σ, (¹⁴Be)n-coin using MoNA array at NSCL-MSU facility. Decay energy spectrum of ¹⁵Be fitted with energy-dependent Breit-Wigner distribution. ¹⁵Be; deduced level, J, π, neutron-unbound resonance, width. Shell-model calculations.

doi: 10.1103/PhysRevC.88.031303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2053. Data from this article have been entered in the XUNDL database. For more information, click here.

2013TH04 Acta Phys.Pol. B44, 543 (2013)

M.Thoennessen, Z.Kohley, A.Spyrou, E.Lunderberg, P.A.DeYoung, H.Attanayake, T.Baumann, D.Bazin, B.A.Brown, G.Christian, D.Divaratne, S.M.Grimes, A.Haagsma, J.E.Finck, N.Frank, B.Luther, S.Mosby, T.Nagi, G.F.Peaslee, W.A.Peters, A.Schiller, J.K.Smith, J.Snyder, M.Strongman, A.Volya

Observation of Ground-state Two-neutron Decay

RADIOACTIVITY ¹⁶Be, ²⁶O(2n); measured decay products, En, In; deduced decay energy spectra. Comparison with calculated two-neutron separation energies, T_1/2, widths.

doi: 10.5506/APhysPolB.44.543
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2013TH07 Nucl.Instrum.Methods Phys.Res. A729, 207 (2013)

M.Thoennessen, G.Christian, Z.Kohley, T.Baumann, M.Jones, J.K.Smith, J.Snyder, A.Spyrou

Novel techniques to search for neutron radioactivity

RADIOACTIVITY ¹⁶B(2n); measured decay products, En, In; deduced new technique, T_1/2 sensitivity. Decay in Target (DiT) and Decay in a Magnetic Field (DiMF) methods.

doi: 10.1016/j.nima.2013.07.035
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2012CH02 Phys.Rev.Lett. 108, 032501 (2012)

G.Christian, N.Frank, S.Ash, T.Baumann, D.Bazin, J.Brown, P.A.DeYoung, J.E.Finck, A.Gade, G.F.Grinyer, A.Grovom, J.D.Hinnefeld, E.M.Lunderberg, B.Luther, M.Mosby, S.Mosby, T.Nagi, G.F.Peaslee, W.F.Rogers, J.K.Smith, J.Snyder, A.Spyrou, M.J.Strongman, M.Thoennessen, M.Warren, D.Weisshaar, A.Wersal

Exploring the Low-Z Shore of the Island of Inversion at N=19

NUCLEAR REACTIONS Be(²⁹Ne, X)²⁸F/²⁷F, E=62 MeV/nucleon; measured reaction products, TOF; deduced ²⁸F ground state energy as resonance in the ²⁷F+n continuum, binding energy. Comparison with USDA/USDB shell model predictions.

doi: 10.1103/PhysRevLett.108.032501
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2012CH12 Phys.Rev. C 85, 034327 (2012)

G.Christian, N.Frank, S.Ash, T.Baumann, P.A.DeYoung, J.E.Finck, A.Gade, G.F.Grinyer, B.Luther, M.Mosby, S.Mosby, J.K.Smith, J.Snyder, A.Spyrou, M.J.Strongman, M.Thoennessen, M.Warren, D.Weisshaar, A.Wersal

Spectroscopy of neutron-unbound ^{27, 28}F

NUCLEAR REACTIONS ⁹Be(²⁹Ne, X)²⁷F/²⁸F, [²⁹Ne secondary beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary beam], E=62 MeV/nucleon; measured particle spectra, energy loss, time-of-flight, (²⁶F)n-, (²⁷F)n-, (²⁶F)nγ-coin, E(n), E(^26,27F). MoNA array for neutrons, CAESAR array for γ rays. ²⁸F; deduced ground-state as unbound resonance in ²⁷F+n continuum, binding energy. ²⁷F; deduced neutron-unbound level. Comparison with USDA/USDB shell model predictions.

doi: 10.1103/PhysRevC.85.034327
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2012KO43 Phys.Rev.Lett. 109, 232501 (2012)

Z.Kohley, J.Snyder, T.Baumann, G.Christian, P.A.DeYoung, J.E.Finck, R.A.Haring-Kaye, M.Jones, E.Lunderberg, B.Luther, S.Mosby, A.Simon, J.K.Smith, A.Spyrou, S.L.Stephenson, M.Thoennessen

Unresolved Question of the ¹⁰He Ground State Resonance

NUCLEAR REACTIONS C, ²H(¹⁴Be, 2n2p)¹⁰He, E=59 MeV/nucleon; measured reaction products, En, In; deduced ground state resonance parameters. Comparison with available data, ¹⁸O secondary beams.

doi: 10.1103/PhysRevLett.109.232501
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2012LU07 Phys.Rev.Lett. 108, 142503 (2012)

E.Lunderberg, P.A.DeYoung, Z.Kohley, H.Attanayake, T.Baumann, D.Bazin, G.Christian, D.Divaratne, S.M.Grimes, A.Haagsma, J.E.Finck, N.Frank, B.Luther, S.Mosby, T.Nagi, G.F.Peaslee, A.Schiller, J.Snyder, A.Spyrou, M.J.Strongman, M.Thoennessen

Evidence for the Ground-State Resonance of ²⁶O

RADIOACTIVITY ²⁶O(2n) [from Be(²⁷F, p)²⁶O, E=82 MeV/nucleon];measured decay products, En, In. ²⁶O; deduced decay energy spectrum, evidence for the ground state or resonance in neutron unbound nucleus, T_1/2 limit. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.108.142503
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2012SM08 Phys.Rev. C 86, 057302 (2012)

J.K.Smith, T.Baumann, B.A.Brown, G.Christian, J.E.Finck, C.R.Hoffman, Z.Kohley, S.Mosby, J.F.Novak, S.J.Quinn, J.Snyder, A.Spyrou, M.J.Strongman, M.Thoennessen

Neutron unbound states in ²⁸Ne and ²⁵F

NUCLEAR REACTIONS ⁹Be(²⁹Na, ²⁸Ne), (²⁶F, ²⁵F), [secondary ²⁹Na and ²⁶F beam from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon primary reaction], E=102 MeV/nucleon; measured charged fragment spectra by TOF and energy loss, neutron spectra using MONA array at NSCL facility, decay energy spectra for ²⁸Ne and ²⁵F reconstructed from the ²⁷Ne+n and ²⁴F+n systems. ²⁵F, ²⁸Ne; deduced unbound levels, J, π, spectroscopic factors, Breit-Wigner resonance. Glauber reaction model analysis. Comparison with shell model calculations.

NUCLEAR STRUCTURE ²⁸Ne, ²⁵F; calculated bound and unbound levels, J, π, spectroscopic factors for ²⁷Ne+n system, widths. Shell model. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.057302
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2012SP01 Phys.Rev.Lett. 108, 102501 (2012)

A.Spyrou, Z.Kohley, T.Baumann, D.Bazin, B.A.Brown, G.Christian, P.A.DeYoung, J.E.Finck, N.Frank, E.Lunderberg, S.Mosby, W.A.Peters, A.Schiller, J.K.Smith, J.Snyder, M.J.Strongman, M.Thoennessen, A.Volya

First Observation of Ground State Dineutron Decay: ¹⁶Be

RADIOACTIVITY ¹⁶Be(2n) [from Be(¹⁷B, p), E=53 MeV/nucleon]; measured decay products, En, In; deduced two-neutron separation energy.

doi: 10.1103/PhysRevLett.108.102501
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2011HO05 Phys.Rev. C 83, 031303 (2011)

C.R.Hoffman, T.Baumann, J.Brown, P.A.DeYoung, J.E.Finck, N.Frank, J.D.Hinnefeld, S.Mosby, W.A.Peters, W.F.Rogers, A.Schiller, J.Snyder, A.Spyrou, S.L.Tabor, M.Thoennessen

Observation of a two-neutron cascade from a resonance in ²⁴O

NUCLEAR REACTIONS ⁹Be(²⁶F, nn), E=85 MeV/nucleon; measured neutron spectra using MoNA array, neutron resonance decay energy, neutron-neutron-fragment, neutron-fragment energies, TOF, ²²O-nn coin. ²⁴O; deduced level, two-neutron cascade from the resonance in ²⁴O to ²²O. ^22,23O; deduced levels. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.83.031303
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2011RE04 Acta Phys.Pol. B42, 671 (2011)

W.Reviol, D.G.Sarantites, X.Chen, M.Montero, O.L.Pechenaya, J.Snyder, R.V.F.Janssens, M.P.Carpenter, C.J.Chiara, T.L.Khoo, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, K.Hauschild, A.Lopez-Martens, D.J.Hartley, S.Frauendorf

Tidal Waves and Onset of Collectivity above N = 126

NUCLEAR REACTIONS ¹⁹⁸Pt(²⁶Mg, X)²¹⁹Th/²²⁰Th, E=128 MeV; ²⁰⁷Pb(¹⁸O, X)²¹⁸Ra/²²¹Th, E=96 MeV; measured reaction products, Eγ, Iγ, ER nucleus-γ-coin.; deduced level scheme, B(E1)/B(E2) ratios as a function of spin, tidal-wave concept.

doi: 10.5506/APhysPolB.42.671
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2009GI07 At.Data Nucl.Data Tables 95, 805 (2009)

J.Q.Ginepro, J.Snyder, M.Thoennessen

Discovery of the cerium isotopes

COMPILATION ^{121,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155}Ce; compiled first identification (or discovery) of isotopes in Ce.

doi: 10.1016/j.adt.2009.06.002
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1977EH01 Phys.Lett. 71B, 455 (1977)

R.D.Ehrlich, B.Lovett, M.Mishina, P.A.Souder, J.Snyder, M.E.Zeller, D.M.Lazarus, I.Nakano

Measurements of Polarization in K^-p Elastic Scattering at Low Energies

NUCLEAR REACTIONS ¹H(K^-, K^-), E=650-1071 MeV/c; measured polarization.

doi: 10.1016/0370-2693(77)90266-0
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1965SN01 Phys.Rev. 138, B770 (1965)

J.W.Snyder, M.L.Pool

Radioactive Decay of Sn¹¹¹

NUCLEAR STRUCTURE ¹¹¹Sn; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.138.B770
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1959BR71 Proc.Roy.Soc.(London) 251, 143 (1959)