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NSR database version of April 11, 2024.

Search: Author = D.Mikolas

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1999AH07      Phys.Rev. C60, 064601 (1999)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, C.M.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, Th.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.M.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.R.Young, J.E.Yurkon

Positron-Electron Pairs Produced in Heavy-Ion Collisions

NUCLEAR REACTIONS ²³²Th(²³⁸U, X), E=5.95 MeV/nucleon; ¹⁸¹Ta(²³⁸U, X), E=5.95, 6.1, 6.3 MeV/nucleon; measured positron, electron spectra, multiplicities, e^-e⁺-coin, angular correlation; deduced no sharp structure in sum-energy spectra. APEX spectrometer.

doi: 10.1103/PhysRevC.60.064601
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1997AH01      Phys.Rev.Lett. 78, 618 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.R.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Search for Monoenergetic Positron Emission from Heavy-Ion Collisions at Coulomb-Barrier Energies

NUCLEAR REACTIONS ¹⁸¹Ta(²³⁸U, X), E=5.95-6.3 MeV/nucleon; ²³²Th(²³⁸U, X), E=5.95 MeV/nucleon; measured positron energy spectra; deduced no structure.

doi: 10.1103/PhysRevLett.78.618
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1997AH04      Phys.Rev. C55, R2755 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.A.Chishti, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, J.S.Greenberg, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Internal Pair Conversion in Heavy Nuclei

NUCLEAR REACTIONS ²⁰⁶Pb(²⁰⁶Pb, X), E=5.90 MeV/nucleon; measured e⁺e^--sum energy spectra, Doppler corrected Eγ; deduced internal pair conversion to gamma branching ratio. ²³²Th(²⁰⁸Pb, X), E=5.80 MeV/nucleon; ²³⁸U(²⁰⁸Pb, X), E=5.80 MeV/nucleon; ¹⁸¹Ta(²³⁸U, X), E=5.95 MeV/nucleon; ²³²Th(²³⁸U, X), E=5.90 MeV/nucleon; measured e⁺e^--sum energy, Doppler corrected Eγ; deduced no discrete lines evidence in e⁺e^- spectra. ²³⁸U deduced new levels evidence.

doi: 10.1103/PhysRevC.55.R2755
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1997AH05      Z.Phys. A358, 235 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.Young, J.E.Yurkon, and the APEX Collaboration

The Positron-Electron Peak Puzzle: Results from APEX

NUCLEAR REACTIONS ²³²Th(²³⁸U, X), E=5.78-5.95 MeV/nucleon; ¹⁸¹Ta(²³⁸U, X), E=5.79-6.3 MeV/nucleon; measured total (e⁺)(heavy-ion)-, (e⁺e^-)(heavy-ion)-coin events number; deduced very low light neutral particle production upper limits.

doi: 10.1007/s002180050316
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1996AH05      Acta Phys.Pol. B27, 387 (1996)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.Gazes, A.L.Hallin, T.Happ, N.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, A.Young, J.E.Yurkon, and the APEX Collaboration

The Positron Peak Puzzle - Recent Results from APEX

NUCLEAR REACTIONS ²³²Th(²³⁸U, X), E=5.95 MeV/nucleon; ¹⁸¹Ta(²³⁸U, X), E=5.96-6.3 MeV/nucleon; ²⁰⁶Pb(²⁰⁶Pb, X), E not given; analyzed e⁺e^--sum energy spectra. ²³²Th, ²³⁸U(²⁰⁸Pb, X), E=5.8 MeV/nucleon; ²³²Th, ¹⁸¹Ta(²³⁸U, X), E=5.95 MeV/nucleon; ²⁰⁶Pb(²⁰⁶Pb, X), E=5.9 MeV/nucleon; analyzed Doppler reconstructed γ spectra; deduced limits on 1.78 MeV ²³⁸U transition possible contribution to (heavy ion)γ-coin.

1996AH07      Nucl.Instrum.Methods Phys.Res. A370, 539 (1996)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, J.S.Greenberg, J.P.Greene, A.L.Hallin, Th.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.M.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.R.Young, J.E.Yurkon

A Solenoidal Spectrometer for Positron-Electron Pairs Produced in Heavy-Ion Collisions

RADIOACTIVITY ⁸⁵Sr(EC); ¹¹³Sn(EC); ²⁰³Hg(β^-); measured electron spectra; deduced apparatus response, efficiency. New solenoidal spectrometer.

NUCLEAR REACTIONS ¹⁸¹Ta(²³⁸U, X), E=6.1 MeV/nucleon; measured γ-, positron energy spectra. New solenoidal spectrometer.

doi: 10.1016/0168-9002(95)00829-2
Citations: PlumX Metrics

1995AH06      Phys.Rev.Lett. 75, 2658 (1995)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Search for Narrow Sum-Energy Lines in Electron-Positron Pair Emission from Heavy-Ion Collisions Near the Coulomb Barrier

NUCLEAR REACTIONS ¹⁸¹Ta(²³⁸U, X), E=5.95-6.3 MeV/nucleon; ²³²Th(²³⁸U, X), E=5.95 MeV/nucleon; measured pair emission sum spectra; deduced no sharp lines evidence, neutral particle isolated decay related features.

doi: 10.1103/PhysRevLett.75.2658
Citations: PlumX Metrics

1994ME24      Nucl.Instrum.Methods Phys.Res. A350, 491 (1994)

D.J.Mercer, D.Mikolas, J.Yurkon, S.M.Austin, D.Bazin, S.Gaff, E.Kashy, D.Kataria, J.S.Winfield, R.R.Betts, D.J.Henderson, A.L.Hallin, M.Liu, F.L.H.Wolfs

A Large Solid-Angle Array for Heavy Ions from APEX

NUCLEAR REACTIONS ⁵⁸Ni(⁵⁸Ni, ⁵⁸Ni), E=200 MeV; measured σ(θ). ¹⁸¹Ta(²³⁸U, X), E=1.45 GeV; measured fragment tof, mass spectra. Large solid-angle array of low pressure multi-wire proportional counters. Other reactions studied.

doi: 10.1016/0168-9002(94)91249-1
Citations: PlumX Metrics

1990AS07      Phys.Lett. 251B, 488 (1990)

K.Asahi, M.Ishihara, N.Inabe, T.Ichihara, T.Kubo, M.Adachi, H.Takanashi, M.Kouguchi, M.Fukuda, D.Mikolas, D.J.Morrissey, D.Beaumel, T.Shimoda, H.Miyatake, N.Takahashi

New Aspect of Intermediate Energy Heavy Ion Reactions. Large Spin Polarization of Fragments

NUCLEAR REACTIONS ¹⁹⁷Au(¹⁴N, ¹²BX), E=40.6 MeV/nucleon; measured ejectile ¹²B spin polarization, yield. Projectile fragmentation.

doi: 10.1016/0370-2693(90)90784-4
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1989ZH04      Phys.Rev. C39, 1985 (1989)

Z.Zhao, M.Gai, B.J.Lund, S.L.Rugari, D.Mikolas, B.A.Brown, J.A.Nolen, Jr., M.Samuel

Beta Decay of ¹⁸N to Alpha Particle Emitting States in ¹⁸O and a Proposed Search for Parity Violation in ¹⁸O

RADIOACTIVITY ¹⁸N(β^-) [from Ta(²²Ne, X), E=35 MeV/nucleon]; measured absolute β-decay branching ratios; deduced log ft, Gamow-Teller matrix elements. ¹⁸O(α) [from ¹⁸N β-decay]; measured total β-delayed α-yield. ¹⁸O deduced possible new levels.

doi: 10.1103/PhysRevC.39.1985
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1988MI03      Phys.Rev. C37, 766 (1988)

D.Mikolas, B.A.Brown, W.Benenson, L.H.Harwood, E.Kashy, J.A.Nolen, Jr., B.Sherrill, J.Stevenson, J.S.Winfield, Z.Q.Xie, R.Sherr

Branching Ratios of ⁹C to Low Lying States in ⁹B

RADIOACTIVITY ⁹C(β⁺) [from Ni(¹²C, X), E=35 MeV/nucleon]; measured β-delayed Ep, Ip, β-delayed Eα, Iα, βαp-coin; deduced log ft. ⁹B levels deduced Iβ, Gamow-Teller transition strengths, comparison with other data.

NUCLEAR STRUCTURE ⁹B, ⁹Be, ⁹C; calculated levels, Gamow-Teller transition strengths, particle decay spectroscopic factors, particle decay reduced widths. Input from ⁹Be(p, n) reaction.

doi: 10.1103/PhysRevC.37.766
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1988SA04      Phys.Rev. C37, 1314 (1988)

M.Samuel, B.A.Brown, D.Mikolas, J.Nolen, B.Sherrill, J.Stevenson, J.S.Winfield, Z.Q.Xie

Measurement of the Beta Decay Half-Life of ¹⁷B

RADIOACTIVITY ⁹Li, ^12,13,15,17B, ¹⁷C, ¹⁹N [from Ta(²³Ne, X), E=35 MeV/nucleon]; measured β-decay T_1/2.

doi: 10.1103/PhysRevC.37.1314
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1988ST06      Phys.Rev. C37, 2220 (1988)

J.Stevenson, B.A.Brown, Y.Chen, J.Clayton, E.Kashy, D.Mikolas, J.Nolen, M.Samuel, B.Sherrill, J.S.Winfield, Z.Q.Xie, R.E.Julies, W.A.Richter

Search for the Exotic Nucleus ¹⁰He

NUCLEAR REACTIONS Sn(¹⁸O, X), E=30 MeV/nucleon; measured fragment mass spectra; deduced ¹⁰He production upper limit.

NUCLEAR STRUCTURE ^{4,5,6,7,8,9,10}He; calculated binding energy. Shell model.

doi: 10.1103/PhysRevC.37.2220
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