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NSR database version of April 25, 2024.

Search: Author = A.Chishti

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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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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

1995AH01      Nucl.Phys. A583, 247c (1995)

I.Ahmad, S.M.Austin, B.B.Back, D.Bazin, R.R.Betts, F.P.Calaprice, K.C.Chan, A.Chishti, P.Chowdhury, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, S.B.Gazes, J.S.Greenberg, A.L.Hallin, T.Happ, J.Last, N.Kaloskamis, E.Kashy, W.Kutschera, C.J.Lister, M.Liu, M.R.Maier, D.Mercer, 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, G.Xu, A.Young, J.E.Yurkon

Positron Production in Heavy Ion Collisions: Current status of the problem

NUCLEAR REACTIONS ¹⁸¹Ta(²³⁸U, X), E=5.9-6.3 MeV/nucleon; compiled, analyzed, reviewed electron, positron production data.

doi: 10.1016/0375-9474(94)00667-C
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

1993CH41      Phys.Rev. C48, 2607 (1993)

A.A.Chishti, P.Chowdhury, D.J.Blumenthal, P.J.Ennis, C.J.Lister, Ch.Winter, D.Vretenar, G.Bonsignori, M.Savoia

Collectivity in Light Zirconium Isotopes: Evolution with neutron number and angular momentum

NUCLEAR REACTIONS ⁵⁸Ni(²⁹Si, n2p), E=110 MeV; measured Eγ, Iγ, DCO ratios. ⁵⁸Ni(³²S, 2pα), E=110 MeV; measured Iγ(θ). ⁵⁴Fe(³³S, n2p), E=105 MeV; analyzed data. ⁵⁸Ni(²⁸Si, 2n2p), E not given; measured recoil distance. ⁸⁴Zr deduced levels, J, π, band structure. ⁸²Zr levels deduced T_1/2. Models comparison.

NUCLEAR STRUCTURE ^86,84,82Zr; calculated levels, g factors, B(λ). Interacting boson model, collective core inclusion.

doi: 10.1103/PhysRevC.48.2607
Citations: PlumX Metrics

1993KA34      Nucl.Instrum.Methods Phys.Res. A330, 447 (1993)

N.I.Kaloskamis, K.C.Chan, A.A.Chishti, J.S.Greenberg, C.J.Lister, S.J.Freedman, M.Wolanski, J.Last, B.Utts

The Trigger Detector for APEX: An array of position-sensitive NaI(Tl) detectors for the imaging of positrons from heavy-ion collisions

RADIOACTIVITY ⁶⁸Ge(EC); measured γγ-coin. Position sensitive cylindrical NaI(Tl) detector.

doi: 10.1016/0168-9002(93)90574-2
Citations: PlumX Metrics

1993MC03      Z.Phys. A344, 369 (1993)

J.H.McNeill, A.A.Chishti, P.J.Daly, W.Gelletly, M.A.C.Hotchkis, M.Piiparinen, B.J.Varley, P.J.Woods, J.Blomqvist

Isomeric Decay Studies using a Recoil Mass Separator. Exotic N = 82 and 83 Nuclei ¹⁵³Yb, ¹⁵³Lu, ¹⁵⁴Lu and ¹⁵⁴Hf

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁴Fe, X), E=245 MeV; measured γ(recoil)-, γγ-coin. ¹⁵³Yb, ^153,154Lu deduced isomer decay, levels, J, π, B(λ), transition Iγ, configuration. ¹⁵⁴Hf deduced levels, J, π, configuration.

doi: 10.1007/BF01283192
Citations: PlumX Metrics

1991HE02      Phys.Rev. C43, R921 (1991)

J.Heese, D.J.Blumenthal, A.A.Chishti, P.Chowdhury, B.Crowell, P.J.Ennis, C.J.Lister, Ch.Winter

Observation of Simultaneous g_9/2 Proton and Neutron Alignment in ⁷⁴Kr

NUCLEAR REACTIONS ⁴⁰Ca(⁴⁰Ca, 2pα), E=125, 140 MeV; measured Iγ, Eγ, γγ-coin, αγγ-coin, DSA. ⁷⁴Kr deduced levels, J, π, T_1/2, rotational bands, B(E2), transitional quadrupole moments, deformation parameters.

doi: 10.1103/PhysRevC.43.R921
Citations: PlumX Metrics

1990CH07      J.Phys.(London) G16, 481 (1990)

A.A.Chishti, W.Gelletly, C.J.Lister, B.J.Varley, O.Skeppstedt

Alignment Anomalies in the Study of High Spins in ⁷⁹Sr

NUCLEAR REACTIONS ⁵⁸Ni(²⁴Mg, n2p), E=65-110 MeV; ²⁴Mg(⁵⁸Ni, n2p), E=190 MeV; measured γγ-, (recoil)γγ-coin. ⁷⁹Sr deduced levels, J, π, band structure.

doi: 10.1088/0954-3899/16/3/018
Citations: PlumX Metrics

1990HE04      Phys.Rev. C41, 603 (1990)

J.Heese, K.P.Lieb, S.Ulbig, B.Wormann, J.Billowes, A.A.Chishti, W.Gelletly, C.J.Lister, B.J.Varley

Electromagnetic Transition Strengths between High Spin States in ⁷⁹Sr and ⁸⁰Sr

NUCLEAR REACTIONS ⁵⁸Ni(²⁴Mg, n2p), (²⁴Mg, 2p), E=80, 85 MeV; ⁵⁴Fe(³²S, 2pα), E=103, 107 MeV; measured Eγ, Iγ, γγ-, nγ-coin, DSA. ⁷⁹Sr deduced levels, J, π, T_1/2, rotational bands, B(E2), transitional quadrupole moments, deformation parameters. ⁸⁰Sr deduced levels, T_1/2, B(E2), transitional quadrupole moments. Cranked shell model.

doi: 10.1103/PhysRevC.41.603
Citations: PlumX Metrics

1990LI25      Phys.Rev. C42, R1191 (1990)

C.J.Lister, P.J.Ennis, A.A.Chishti, B.J.Varley, W.Gelletly, H.G.Price, A.N.James

Shape Changes in N = Z Nuclei from Germanium to Zirconium

NUCLEAR REACTIONS, ICPND ¹²C(⁵⁴Fe, 2n), E=155, 165 MeV; ¹²C(⁵⁸Ni, 2n), E=175 MeV; ²⁴Mg(⁵⁴Fe, 2n), E=175 MeV; measured Eγ, Iγ, γγ-, recoil γ-, recoil γγ-coin, production σ. ⁶⁴Ge, ⁶⁸Se, ⁷⁶Sr deduced levels. Compton suppressed Ge detectors, recoil separator, NE213 detectors.

doi: 10.1103/PhysRevC.42.R1191
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1990MC02      Z.Phys. A335, 241 (1990)

J.H.McNeill, J.Blomqvist, A.A.Chishti, P.J.Daly, W.Gelletly, M.A.C.Hotchkis, M.Piiparinen, B.J.Varley, P.J.Woods

A 35 μs Isomer in the Exotic N = 83 Nucleus ¹⁵⁴Lu

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁴Fe, X), E=245 MeV; measured γγ-coin. ¹⁵⁴Lu deduced isomer T_1/2, decay features, levels, J, π, configuration, B(λ).

1990SK02      Nucl.Phys. A511, 137 (1990)

O.Skeppstedt, C.J.Lister, A.A.Chishti, B.J.Varley, W.Gelletly, U.Lenz, R.Moscrop, L.Goettig

High-Spin Structure of ⁷⁹Rb

NUCLEAR REACTIONS ²⁴Mg(⁵⁸Ni, 3p), E=190 MeV; measured Eγ, Iγ, γγ-coin. ⁷⁹Rb deduced levels, J, π. Enriched target, germanium detector array, recoil separator.

doi: 10.1016/0375-9474(90)90030-P
Citations: PlumX Metrics

1989CH36      Nucl.Phys. A501, 568 (1989)

A.A.Chishti, W.Gelletly, C.J.Lister, J.H.McNeill, B.J.Varley, D.J.G.Love, O.Skeppstedt

High-Spin States in ⁷⁵Kr

NUCLEAR REACTIONS ²⁴Mg(⁵⁴Fe, n2p), E=177, 190 MeV; measured γγ-, nγγ-coin. ⁷⁵Kr deduced levels, J, π, band structure.

doi: 10.1016/0375-9474(89)90149-8
Citations: PlumX Metrics

1989GR07      Phys.Rev. C39, 1780 (1989)

C.J.Gross, J.Heese, K.P.Lieb, C.J.Lister, B.J.Varley, A.A.Chishti, J.H.McNeil, W.Gelletly

High Spin States in ⁷⁸Sr

NUCLEAR REACTIONS ⁵⁸Ni(²⁴Mg, 2n2p), E=110 MeV; measured Eγ, Iγ, γγ-, nγγ-coin. ⁷⁸Sr deduced levels, J, π. Cranked shell model.

doi: 10.1103/PhysRevC.39.1780
Citations: PlumX Metrics

1989GR21      Nucl.Phys. A501, 367 (1989)

C.J.Gross, J.Heese, K.P.Lieb, S.Ulbig, W.Nazarewicz, C.J.Lister, B.J.Varley, J.Billowes, A.A.Chishti, J.H.McNeill, W.Gelletly

Band Crossings and Near-Rigid Rotation in ⁷⁶Kr and ⁷⁸Kr

NUCLEAR REACTIONS ⁵⁸Ni(²⁴Mg, 2pα), E=85, 110 MeV; ⁵⁸Ni(²⁴Mg, 4p), E=110 MeV; measured Eγ, Iγ, γγ-coin, DSA. ^76,78Kr deduced levels, J, π, T_1/2, band structure. Enriched target.

doi: 10.1016/0375-9474(89)90298-4
Citations: PlumX Metrics

1989MC01      Z.Phys. A332, 105 (1989)

J.H.McNeill, A.A.Chishti, P.J.Daly, M.A.C.Hotchkis, M.Piiparinen, B.J.Varley

A 15 μs Isomer in the Z = 70 N = 83 Nucleus ¹⁵³Yb

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁴Fe, X), E=245 MeV; measured Eγ, Iγ, γγ-, γ(X-ray)-coin. ¹⁵³Yb deduced isomer, T_1/2, J, π, configuration. Fusion-evaporation recoil product mass analysis.

1989MC07      Phys.Rev.Lett. 63, 860 (1989)

J.H.McNeill, J.Blomqvist, A.A.Chishti, P.J.Daly, W.Gelletly, M.A.C.Hotchkis, M.Piiparinen, B.J.Varley, P.J.Woods

Exotic N = 82 Nuclei ¹⁵³Lu and ¹⁵⁴Hf and Filling of the πh_11/2 Subshell

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁴Fe, 2n), (⁵⁴Fe, np), (⁵⁴Fe, 2np), (⁵⁴Fe, n2p), E=235, 245 MeV; measured relative isomeric yields; calculated residual production σ. γ-ray spectroscopy.

RADIOACTIVITY ^153mLu, ^154mHf [from ¹⁰²Pd(⁵⁴Fe, xnyp), E=235, 245 MeV]; measured γγ-, γ(X-ray)-coin; deduced isomer T_1/2, configuration, decay scheme, level J, π, B(λ).

doi: 10.1103/PhysRevLett.63.860
Citations: PlumX Metrics

1988GR23      Z.Phys. A331, 361 (1988)

C.J.Gross, J.Heese, K.P.Lieb, L.Luhmann, B.Wormann, A.A.Chishti, W.Gelletly, C.J.Lister, J.H.McNeill, B.J.Varley

Simultaneous g_9/2 Proton and Neutron Alignments in ⁷⁶Kr

NUCLEAR REACTIONS ⁵⁸Ni(²⁴Mg, 2pα), E=110 MeV; ⁴⁰Ca(⁴⁰Ca, 4p), E=155 MeV; measured Eγ, Iγ, γγ-coin. ⁷⁶Kr deduced levels, J, π, moment of inertia, alignment features.

1988MO24      J.Phys.(London) G14, L189 (1988)

R.Moscrop, A.A.Chishti, W.Gelletly, C.J.Lister, B.J.Varley

Pseudo-Mirror Nuclei with A = 100 and A = 130

NUCLEAR STRUCTURE ^100,104,106Mo, ^130,128,126Ce, ^134,132,130Nd, ^98,100,102Zr; analyzed, compared A ≈ 100, A ≈ 130 levels; deduced similarity, pseudo-mirror nature.

doi: 10.1088/0305-4616/14/9/003
Citations: PlumX Metrics

1987LI14      Phys.Rev.Lett. 59, 1270 (1987)

C.J.Lister, M.Campbell, A.A.Chishti, W.Gelletly, L.Goettig, R.Moscrop, B.J.Varley, A.N.James, T.Morrison, H.G.Price, J.Simpson, K.Connel, O.Skeppstedt

Gamma Radiation from the N = Z Nucleus ⁸⁰₄₀Zr₄₀

NUCLEAR REACTIONS ²⁴Mg(⁵⁸Ni, 2n), E=180 MeV; measured σ, Eγ, Iγ, γγ-coin. ⁸⁰Zr deduced levels, quadrupole deformation. Recoil separator, Ge detectors.

doi: 10.1103/PhysRevLett.59.1270
Citations: PlumX Metrics

1987VA23      Phys.Lett. 194B, 463 (1987)

B.J.Varley, M.Campbell, A.A.Chishti, W.Gelletly, L.Goettig, C.J.Lister, A.N.James, O.Skeppstedt

Evidence for Shape Coexistence in the N = Z Nucleus ₃₆⁷²Kr₃₆

NUCLEAR REACTIONS ¹⁶O(⁵⁸Ni, 2n), E=170 MeV; measured Eγ, Iγ, σ. ⁷²Kr deduced level, production σ, γ transitions. Recoil Separator.

doi: 10.1016/0370-2693(87)90217-6
Citations: PlumX Metrics

Note: The following list of authors and aliases matches the search parameter A.Chishti: , A.A.CHISHTI