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NSR database version of April 11, 2024.

Search: Author = J.Yurkon

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2023BO18      Phys.Rev. C 108, 034604 (2023)

M.Bowry, O.B.Tarasov, J.S.Berryman, V.Bader, D.Bazin, T.Chupp, H.L.Crawford, A.Gade, E.Lunderberg, A.Ratkiewicz, F.Recchia, B.M.Sherrill, D.Smalley, A.Stolz, S.R.Stroberg, D.Weisshaar, S.Williams, K.Wimmer, J.Yurkon

Abrasion-fission reactions at intermediate energies

doi: 10.1103/PhysRevC.108.034604
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2021KA39      Phys.Lett. B 822, 136681 (2021)

M.Kaneko, T.Murakami, T.Isobe, M.Kurata-Nishimura, A.Ono, N.Ikeno, J.Barney, G.Cerizza, J.Estee, G.Jhang, J.W.Lee, W.G.Lynch, C.Santamaria, C.Y.Tsang, M.B.Tsang, R.Wang, D.S.Ahn, L.Atar, T.Aumann, H.Baba, K.Boretzky, J.Brzychczyk, N.Chiga, N.Fukuda, I.Gasparic, B.Hong, A.Horvat, T.Ichihara, K.Ieki, N.Inabe, Y.J.Kim, T.Kobayashi, Y.Kondo, P.Lasko, H.S.Lee, Y.Leifels, J.Lukasik, J.Manfredi, A.B.McIntosh, P.Morfouace, T.Nakamura, N.Nakatsuka, S.Nishimura, R.Olsen, H.Otsu, P.Pawlowski, K.Pelczar, D.Rossi, H.Sakurai, H.Sato, H.Scheit, R.Shane, Y.Shimizu, H.Simon, T.Sumikama, D.Suzuki, H.Suzuki, H.Takeda, S.Tangwancharoen, Y.Togano, H.Tornqvist, Z.Xiao, S.J.Yennello, J.Yurkon, Y.Zhang

Rapidity distributions of Z=1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon

NUCLEAR REACTIONS 124Sn(132Sn, X), 112Sn(108Sn, X), E=270 MeV/nucleon; measured reaction products. 1,2,3H; deduced rapidity distributions of hydrogen isotopes emitted from central collisions. Comparison with antisymmetrized molecular dynamics (AMD) calculations. RIKEN-RIBF facility.

doi: 10.1016/j.physletb.2021.136681
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2020ME06      Phys.Rev. C 101, 052801 (2020)

Z.Meisel, S.George, S.Ahn, D.Bazin, B.A.Brown, J.Browne, J.F.Carpino, H.Chung, R.H.Cyburt, A.Estrade, M.Famiano, A.Gade, C.Langer, M.Matos, W.Mittig, F.Montes, D.J.Morrissey, J.Pereira, H.Schatz, J.Schatz, M.Scott, D.Shapira, K.Smith, J.Stevens, W.Tan, O.Tarasov, S.Towers, K.Wimmer, J.R.Winkelbauer, J.Yurkon, R.G.T.Zegers

Nuclear mass measurements map the structure of atomic nuclei and accreting neutron stars

ATOMIC MASSES 48,49Ar, 52,53,54,55,56,57Sc, 56,57,58,59Ti, 57,58,59,60,61,62V, 64,65Cr, 67,68Mn, 67,68,69,70Fe; measured time of flight, ΔE, Bπ, and mass excess using the A1900 fragment separator and the S800 spectrograph for particle identification at the NSCL-MSU facility; deduced S(2n), and Dn(Z, A)=S(n)(Z, A+1)-S(n)(Z, A), related to pairing gap. Comparison with available evaluated data in AME2016, and with shell model calculations using GX1A Hamiltonian for Sc isotopes. Discussion of upper-Z limit for N=34 subshell closure and lower-Z limit for N=40 subshell, and impact on electron-capture cooling in neutron star crusts. Isotopes produced in 9Be(82Se, X), E=140 MeV/nucleon reaction.

doi: 10.1103/PhysRevC.101.052801
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2018BR04      Phys.Lett. B 778, 155 (2018)

J.Bradt, Y.Ayyad, D.Bazin, W.Mittig, T.Ahn, S.Beceiro Novo, B.A.Brown, L.Carpenter, M.Cortesi, M.P.Kuchera, W.G.Lynch, S.Rost, N.Watwood, J.Yurkon, J.Barney, U.Datta, J.Estee, A.Gillibert, J.Manfredi, P.Morfouace, D.Perez-Loureiro, E.Pollacco, J.Sammut, S.Sweany

Study of spectroscopic factors at N = 29 using isobaric analogue resonances in inverse kinematics

NUCLEAR REACTIONS 1H(46Ar, X), E<140 MeV/nucleon; measured reaction products, Ep, Ip. 46,47Ar, 47K; deduced energy levels, J, π, resonance widths. Comparison with R-matrix calculations.

doi: 10.1016/j.physletb.2018.01.015
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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.


2016ME07      Phys.Rev. C 93, 035805 (2016)

Z.Meisel, S.George, S.Ahn, D.Bazin, B.A.Brown, J.Browne, J.F.Carpino, H.Chung, R.H.Cyburt, A.Estrade, M.Famiano, A.Gade, C.Langer, M.Matos, W.Mittig, F.Montes, D.J.Morrissey, J.Pereira, H.Schatz, J.Schatz, M.Scott, D.Shapira, K.Sieja, K.Smith, J.Stevens, W.Tan, O.Tarasov, S.Towers, K.Wimmer, J.R.Winkelbauer, J.Yurkon, R.G.T.Zegers

Time-of-flight mass measurements of neutron-rich chromium isotopes up to N=40 and implications for the accreted neutron star crust

ATOMIC MASSES 59,60,61,62,63,64Cr; measured mass excesses by time-of-flight (TOF) method using 9Be(82Se, X), E=140 MeV/nucleon for production of Si to Zn isotopes and A1900 fragment separator and S800 spectrograph for fragment separation and analysis at NSCL-MSU. TOF versus mass contour plot obtained for Ar (A=44-49), K (A=47-52), Ca (A=49-55), Sc (A=52-58), Ti (A=54-60), V (A=57-63), Cr (A=59-66), Mn (A=62-70) and Fe (A=64-71) isotopes. Analyzed S(2n) trends and compared to AME-2012. Comparison with state-of-the-art shell-model calculations using modified Lenzi-Nowacki-Poves-Sieja interaction in the fp shell, and with AME-2012 data. Mass of 64Cr used in accreted neutron star crust network calculations, and deduced reduction in strength depth of electron-capture heating from A=64 isobaric chain.

NUCLEAR REACTIONS 9Be(82Se, X), E=140 MeV/nucleon; measured time-of-flight, energy loss, fragment yields of 150 isotopes from Si to Zn using A1900 fragment separator and S800 spectrograph at NSCL-MSU.

doi: 10.1103/PhysRevC.93.035805
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2015ME01      Phys.Rev.Lett. 114, 022501 (2015)

Z.Meisel, S.George, S.Ahn, J.Browne, D.Bazin, B.A.Brown, J.F.Carpino, H.Chung, R.H.Cyburt, A.Estrade, M.Famiano, A.Gade, C.Langer, M.Matos, W.Mittig, F.Montes, D.J.Morrissey, J.Pereira, H.Schatz, J.Schatz, M.Scott, D.Shapira, K.Smith, J.Stevens, W.Tan, O.Tarasov, S.Towers, K.Wimmer, J.R.Winkelbauer, J.Yurkon, R.G.T.Zegers

Mass Measurements Demonstrate a Strong N=28 Shell Gap in Argon

ATOMIC MASSES 48,49Ar; measured time of flight; deduced masses, N=28 closed shell, problems of shell model calculations.

doi: 10.1103/PhysRevLett.114.022501
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2015ME08      Phys.Rev.Lett. 115, 162501 (2015)

Z.Meisel, S.George, S.Ahn, D.Bazin, B.A.Brown, J.Browne, J.F.Carpino, H.Chung, A.L.Cole, R.H.Cyburt, A.Estrade, M.Famiano, A.Gade, C.Langer, M.Matos, W.Mittig, F.Montes, D.J.Morrissey, J.Pereira, H.Schatz, J.Schatz, M.Scott, D.Shapira, K.Smith, J.Stevens, W.Tan, O.Tarasov, S.Towers, K.Wimmer, J.R.Winkelbauer, J.Yurkon, R.G.T.Zegers

Mass Measurement of 56Sc Reveals a Small A=56 Odd-Even Mass Staggering, Implying a Cooler Accreted Neutron Star Crust

ATOMIC MASSES 52,53,54,55,56,57Sc; measured rigidity-corrected time-of-flight distributions; deduced atomic mass excesses. Comparison with AME 2012, theoretical models.

doi: 10.1103/PhysRevLett.115.162501
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2011GU14      Phys.Rev. C 83, 064318 (2011)

C.J.Guess, T.Adachi, H.Akimune, A.Algora, S.M.Austin, D.Bazin, B.A.Brown, C.Caesar, J.M.Deaven, H.Ejiri, E.Estevez, D.Fang, A.Faessler, D.Frekers, H.Fujita, Y.Fujita, M.Fujiwara, G.F.Grinyer, M.N.Harakeh, K.Hatanaka, C.Herlitzius, K.Hirota, G.W.Hitt, D.Ishikawa, H.Matsubara, R.Meharchand, F.Molina, H.Okamura, H.J.Ong, G.Perdikakis, V.Rodin, B.Rubio, Y.Shimbara, G.Susoy, T.Suzuki, A.Tamii, J.H.Thies, C.Tur, N.Verhanovitz, M.Yosoi, J.Yurkon, R.G.T.Zegers, J.Zenihiro

The 150Nd(3He, t) and 150Sm(t, 3He) reactions with applications to ββ decay of 150Nd

NUCLEAR REACTIONS 150Nd(3He, t), E=140 MeV/nucleon; 150Sm(t, 3He), E=115 MeV/nucleon; measured triton and 3He spectra, excitation energy spectra, differential cross sections, σ(θ) 150Pm; deduced B(GT) strengths; isovector spin-flip giant monopole resonance (IVSGMR). Grand Raiden Spectrometer for (3He, t) and S-800 spectrometer for (t, 3He). Comparison with Quasi-Particle Random Phase Approximation (QRPA) calculations. Application to double β decay of 150Nd.

RADIOACTIVITY 150Nd(2β-); calculated matrix elements for 0νββ and 2νββ decay modes using QRPA calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.83.064318
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2347. Data from this article have been entered in the XUNDL database. For more information, click here.


2010ZE03      Phys.Rev.Lett. 104, 212504 (2010)

R.G.T.Zegers, R.Meharchand, Y.Shimbara, S.M.Austin, D.Bazin, B.A.Brown, C.Aa.Diget, A.Gade, C.J.Guess, M.Hausmann, G.W.Hitt, M.E.Howard, M.King, D.Miller, S.Noji, A.Signoracci, K.Starosta, C.Tur, C.Vaman, P.Voss, D.Weisshaar, J.Yurkon

34P(7Li, 7Be+γ) Reaction at 100A MeV in Inverse Kinematics

NUCLEAR REACTIONS 34P(7Li, γ7Be)34Si, E=100 MeV/nucleon; measured Eγ, Iγ, γ-particle coin.; deduced σ(θ), β+ Gamow-Teller transition strength distribution. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.104.212504
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2002DA15      Nucl.Phys. A701, 14c (2002)

B.Davids, D.W.Anthony, T.Aumann, S.M.Austin, T.Baumann, D.Bazin, R.R.C.Clement, P.A.Lofy, T.Nakamura, B.M.Sherrill, J.Yurkon, C.N.Davids, H.Esbensen

A Kinematically Complete Measurement of the Coulomb Dissociation of 8B

NUCLEAR REACTIONS Pb(8B, p7Be), E=83 MeV/nucleon; measured particle spectra; deduced Coulomb dissociation σ. 7Be(p, γ), E=low; deduced astrophysical S-factor. Kinematically complete measurement.

doi: 10.1016/S0375-9474(01)01538-X
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2001CA37      Phys.Rev. C64, 025802 (2001)

J.A.Caggiano, D.Bazin, W.Benenson, B.Davids, R.Ibbotson, H.Scheit, B.M.Sherrill, M.Steiner, J.Yurkon, A.F.Zeller, B.Blank, M.Chartier, J.Greene, J.A.Nolen, Jr., A.H.Wuosmaa, M.Bhattacharya, A.Garcia, M.Wiescher

Spectroscopy of 23Al and 27P using the (7Li, 8He) Reaction and the Implications for 22Na and 26Al Nucleosynthesis in Explosive Hydrogen Burning

NUCLEAR REACTIONS 9Be, 10B, 24Mg, 28Si(7Li, 8He), E=50.1 MeV/nucleon; measured particle spectra. 23Al, 27P deduced level energies. 22Mg, 26Si(p, γ), E=low; deduced stellar reaction rates.

ATOMIC MASSES 23Al, 27P; measured ground-state mass excess.

doi: 10.1103/PhysRevC.64.025802
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2001DA03      Phys.Rev.Lett. 86, 2750 (2001)

B.Davids, D.W.Anthony, T.Aumann, S.M.Austin, T.Baumann, D.Bazin, R.R.C.Clement, C.N.Davids, H.Esbensen, P.A.Lofy, T.Nakamura, B.M.Sherrill, J.Yurkon

S17(0) Determined from the Coulomb Breakup of 83 MeV/Nucleon 8B

NUCLEAR REACTIONS Pb(8B, p7Be), E=83 MeV/nucleon; measured particle spectra, σ(E, θ). 7Be(p, γ), E=low; deduced astrophysical S-factor. Kinematically complete measurement, first-order perturbation theory analysis.

doi: 10.1103/PhysRevLett.86.2750
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2001EN05      Nucl.Phys. A690, 235c (2001)

J.Enders, D.W.Anthony, T.Aumann, A.Bauer, T.Baumann, D.Bazin, Y.Blumenfeld, B.A.Brown, T.Glasmacher, P.G.Hansen, R.W.Ibbotson, P.A.Lofy, V.Maddalena, K.L.Miller, T.Nakamura, A.Navin, B.V.Pritychenko, B.M.Sherrill, E.J.Spears, M.Steiner, J.A.Tostevin, A.Wagner, J.Yurkon

Study of 34, 35Si and 37S with Single-Neutron Removal Reactions

NUCLEAR REACTIONS 9Be(34Si, 33Si), (35Si, 34Si), (37S, 36S), E ≈ 60 MeV/nucleon; measured parallel momentum spectra, Eγ, Iγ, σ(E), deduced role of intruder configurations.

doi: 10.1016/S0375-9474(01)00948-4
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2001MA08      Phys.Rev. C63, 024613 (2001)

V.Maddalena, T.Aumann, D.Bazin, B.A.Brown, J.A.Caggiano, B.Davids, T.Glasmacher, P.G.Hansen, R.W.Ibbotson, A.Navin, B.V.Pritychenko, H.Scheit, B.M.Sherrill, M.Steiner, J.A.Tostevin, J.Yurkon

Single-Neutron Knockout Reactions: Application to the spectroscopy of 16, 17, 19C

NUCLEAR REACTIONS 9Be(16C, n15C), (17C, n16C), (19C, n18C), E ≈ 60 MeV/nucleon; measured Eγ, Iγ, σ(E), momentum distributions. 16,17,19C deduced levels, J, π, spectroscopic factors. Secondary beams from 22Ne fragmentation. Comparisons with model predictions.

doi: 10.1103/PhysRevC.63.024613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1986.


2001MA21      Nucl.Phys. A682, 332c (2001)

V.Maddalena, T.Aumann, D.Bazin, B.A.Brown, J.A.Caggiano, B.Davids, T.Glasmacher, P.G.Hansen, R.W.Ibbotson, A.Navin, B.V.Pritychenko, H.Scheit, B.M.Sherrill, M.Steiner, J.A.Tostevin, J.Yurkon

One-Nucleon Knockout Reactions: The test case 15C and the single-particle structure of 16, 17, 19C

NUCLEAR REACTIONS 9Be(15C, n14C), (16C, n15C), (17C, n16C), (19C, n18C), E ≈ 60 MeV/nucleon; measured longitudinal momentum distributions, σ(E). 16,17,19C deduced single-particle structure.

doi: 10.1016/S0375-9474(00)00657-6
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1986.


2001NA19      Nucl.Phys. A687, 97c (2001)

T.Nakamura, T.Aumann, D.Bazin, Y.Blumenfeld, B.A.Brown, J.Caggiano, R.Clement, T.Glasmacher, P.A.Lofy, A.Navin, B.V.Pritychenko, B.M.Sherrill, J.Yurkon

Structure of the Halo Nucleus 6He Studied via the 6Li(t, 3He)6He Reaction

NUCLEAR REACTIONS 6Li(t, 3He), E=336 MeV; measured σ(θ) vs excitation energy, resonance energy, widths and spectroscopic factors. DWBA calculations.

doi: 10.1016/S0375-9474(01)00607-8
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0761.


2000NA23      Phys.Rev.Lett. 85, 266 (2000)

A.Navin, D.W.Anthony, T.Aumann, T.Baumann, D.Bazin, Y.Blumenfeld, B.A.Brown, T.Glasmacher, P.G.Hansen, R.W.Ibbotson, P.A.Lofy, V.Maddalena, K.Miller, T.Nakamura, B.V.Pritychenko, B.M.Sherrill, E.Spears, M.Steiner, J.A.Tostevin, J.Yurkon, A.Wagner

Direct Evidence for the Breakdown of the N = 8 Shell Closure in 12Be

NUCLEAR REACTIONS 9Be(12Be, 11BeX), E=78 MeV/nucleon; measured σ(E, θ), longitudinal momentum distribution, γ spectrum. 11Be levels deduced spectroscopic factors, no N=8 shell closure. S800 spectrograph.

doi: 10.1103/PhysRevLett.85.266
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1153.


2000NA35      Phys.Lett. 493B, 209 (2000)

T.Nakamura, T.Aumann, D.Bazin, Y.Blumenfeld, B.A.Brown, J.Caggiano, R.Clement, T.Glasmacher, P.A.Lofy, A.Navin, B.V.Pritychenko, B.M.Sherrill, J.Yurkon

Structure of the Weakly-Bound Nucleus 6He Studied via the 6Li(t, 3He)6He Reaction

NUCLEAR REACTIONS 6Li(t, 3He), E=336 MeV; measured σ(E, θ). 6He deduced excited states features. DWBA analysis, shell model calculations.

doi: 10.1016/S0370-2693(00)01146-1
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0761.


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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1999CA48      Phys.Rev. C60, 064322 (1999)

J.A.Caggiano, D.Bazin, W.Benenson, B.Davids, B.M.Sherrill, M.Steiner, J.Yurkon, A.F.Zeller, B.Blank

Spectroscopy of the 10Li Nucleus

NUCLEAR REACTIONS 9Be, 12C(9Be, 8B), (9Be, 11C), E=40.1 MeV/nucleon; measured particle spectra, σ(θ). 10Li deduced low-lying resonance energy, width. S800 spectrograph.

doi: 10.1103/PhysRevC.60.064322
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0970.


1998DA14      Phys.Rev.Lett. 81, 2209 (1998)

B.Davids, D.W.Anthony, S.M.Austin, D.Bazin, B.Blank, J.A.Caggiano, M.Chartier, H.Esbensen, P.Hui, C.F.Powell, H.Scheit, B.M.Sherrill, M.Steiner, P.Thirolf, J.Yurkon, A.Zeller

Measurement of E2 Transitions in the Coulomb Dissociation of 8B

NUCLEAR REACTIONS 208Pb(8B, p7Be), E=44, 81 MeV/nucleon; measured fragments longitudinal momentum distributions; deduced relative E2 transition strength.

doi: 10.1103/PhysRevLett.81.2209
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1998NA34      Phys.Rev.Lett. 81, 5089 (1998)

A.Navin, D.Bazin, B.A.Brown, B.Davids, G.Gervais, T.Glasmacher, K.Govaert, P.G.Hansen, M.Hellstrom, R.W.Ibbotson, V.Maddalena, B.Pritychenko, H.Scheit, B.M.Sherrill, M.Steiner, J.A.Tostevin, J.Yurkon

Spectroscopy of Radioactive Beams from Single-Nucleon Knockout Reactions: Application to the sd shell nuclei 25Al and 26, 27, 28P

NUCLEAR REACTIONS 9Be(25Al, p24Mg), (26P, p25Si), (27P, p26Si), (28P, p27Si), E ≈ 65 MeV/nucleon; measured Eγ, Iγ, (residue)γ-coin, momentum distributions following one-proton removal; deduced σ. 25Al, 26,27,28P deduced ground-state characteristics, halo features. Radioactive beams from fragmentation of 36Ar primary beam.

doi: 10.1103/PhysRevLett.81.5089
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1982.


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
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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
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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
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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
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1993CH10      Phys.Rev. C47, 1462 (1993)

Y.Chen, E.Kashy, D.Bazin, W.Benenson, D.J.Morrissey, N.A.Orr, B.M.Sherrill, J.A.Winger, B.Young, J.Yurkon

Half-Life of 32Si

RADIOACTIVITY 32Si(β-) [from 9Be(40Ar, X), E=65 MeV/nucleon]; measured specific activity; deduced T1/2. Two independent measurements.

doi: 10.1103/PhysRevC.47.1462
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1989KA15      Phys.Rev. C40, R1 (1989)

E.Kashy, W.Bauer, Y.Chen, A.Galonsky, J.Gaudiello, M.Maier, D.J.Morrissey, R.A.Pelak, M.B.Tsang, J.Yurkon

Search for Neutron Emission from Deuterium-Loaded Palladium

NUCLEAR REACTIONS 2H(d, n), E=low; measured possible neutron emission upper limit. Heavy water electrolysis, palladium cathode.

doi: 10.1103/PhysRevC.40.R1
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1985HA19      Phys.Rev. C32, 145 (1985)

B.E.Hasselquist, G.M.Crawley, B.V.Jacak, Z.M.Koenig, G.D.Westfall, J.E.Yurkon, R.S.Tickle, J.P.Dufour, T.J.M.Symons

Light-Particle-Complex-Fragment Coincidence Cross Sections from Intermediate Energy Nucleus-Nucleus Collisions

NUCLEAR REACTIONS 197Au, 27Al(12C, dX), (12C, tX), E=30 MeV/nucleon; measured inclusive σ(θp, Ep), σ(θd, Ed), σ(θt, Et). 197Au(40Ar, pX), (40Ar, dX), (40Ar, tX), (40Ar, 3HeX), (40Ar, αX), E=92 MeV/nucleon; measured inclusive σ(θp, Ep), σ(θd, Ed), σ(θt, Et), σ(θ(3He), E(3He)), σ(θα, Eα). Moving source model.

doi: 10.1103/PhysRevC.32.145
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1985WE14      Nucl.Instrum.Methods 238, 347 (1985)

G.D.Westfall, J.E.Yurkon, J.Van Der Plicht, Z.M.Koenig, B.V.Jacak, R.Fox, G.M.Crawley, M.R.Maier, B.E.Hasselquist, R.S.Tickle, D.Horn

A Logarithmic Detection System Suitable for a 4π Array

NUCLEAR REACTIONS 197Au(14N, X), E=35 MeV/nucleon; 58Ni(35Cl, X), E=230 MeV; 12C(12C, X), E=30 MeV/nucleon; measured fragment, charge spectra.

doi: 10.1016/0168-9002(85)90472-3
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Note: The following list of authors and aliases matches the search parameter J.Yurkon: , J.E.YURKON