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NSR database version of April 11, 2024.

Search: Author = G.P.Gwinner

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2023JA05      Nucl.Phys. A1033, 122636 (2023)

A.Jacobs, C.Andreoiu, J.Bergmann, T.Brunner, T.Dickel, I.Dillmann, E.Dunling, J.Flowerdew, L.Graham, G.Gwinner, Z.Hockenbery, W.J.Huang, B.Kootte, Y.Lan, K.G.Leach, E.Leistenschneider, D.Lunney, E.M.Lykiardopoulou, V.Monier, I.Mukul, S.F.Paul, W.R.Plass, M.P.Reiter, C.Scheidenberger, R.Thompson, J.L.Tracy, C.Will, M.E.Wieser, J.Dilling, A.A.Kwiatkowski

Improved high-precision mass measurements of mid-shell neon isotopes

ATOMIC MASSES 24,25,26Ne; measured radioactive ion beam (RIB) TOF spectra; deduced mass excess. Comparison with AME2020. TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN), the Multi-Reflection Time-of-Flight Mass-Spectrometer (MR-TOF-MS).

doi: 10.1016/j.nuclphysa.2023.122636
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2022PO02      Phys.Rev. C 105, L041301 (2022)

W.S.Porter, B.Ashrafkhani, J.Bergmann, C.Brown, T.Brunner, J.D.Cardona, D.Curien, I.Dedes, T.Dickel, J.Dudek, E.Dunling, G.Gwinner, Z.Hockenbery, J.D.Holt, C.Hornung, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, G.Kripko-Koncz, E.M.Lykiardopoulou, T.Miyagi, I.Mukul, T.Murbock, W.R.Plass, M.P.Reiter, J.Ringuette, C.Scheidenberger, R.Silwal, C.Walls, H.L.Wang, Y.Wang, J.Yang, J.Dilling, A.A.Kwiatkowski

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

ATOMIC MASSES 63,64,65,65m,66,67,68,69,69m,70Fe; measured time-of-flight; deduced mass excess, S(2n), pairing gap. Systematics of S(2n) values for Z=24–28 isotope chains. Compared to mean-field calculations employing recent Woods-Saxon Hamiltonian and results from the multishell valence-space in-medium similarity renormalization group (VS-IMSRG). Comparison to recommended values from AME2020. TITAN (TRIUMF’s Ion Trap for Atomic and Nuclear science) Multiple-Reflection Time-of- Flight Mass Spectrometer.

doi: 10.1103/PhysRevC.105.L041301
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2022SI20      Phys.Lett. B 833, 137288 (2022)

R.Silwal, C.Andreoiu, B.Ashrafkhani, J.Bergmann, T.Brunner, J.Cardona, K.Dietrich, E.Dunling, G.Gwinner, Z.Hockenbery, J.D.Holt, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, Y.Lan, D.Lunney, E.M.Lykiardopoulou, T.Miyagi, M.Mougeot, I.Mukul, T.Murbock, W.S.Porter, M.Reiter, J.Ringuette, J.Dilling, A.A.Kwiatkowski

Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

ATOMIC MASSES 59Cr, 61,62,63,64,65Cr; measured frequencies, TOF; deduced mass excess values, pairing gap, two-neutron separation energies, intruder configurations. Comparison with theoretical calculations, AME2020 evaluation. MR-TOF-MS, part of the TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility.

doi: 10.1016/j.physletb.2022.137288
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2021BE23      Phys.Rev.Lett. 127, 112501 (2021)

S.Beck, B.Kootte, I.Dedes, T.Dickel, A.A.Kwiatkowski, E.M.Lykiardopoulou, W.R.Plass, M.P.Reiter, C.Andreoiu, J.Bergmann, T.Brunner, D.Curien, J.Dilling, J.Dudek, E.Dunling, J.Flowerdew, A.Gaamouci, L.Graham, G.Gwinner, A.Jacobs, R.Klawitter, Y.Lan, E.Leistenschneider, N.Minkov, V.Monier, I.Mukul, S.F.Paul, C.Scheidenberger, R.I.Thompson, J.L.Tracy, Jr., M.Vansteenkiste, H.-L.Wang, M.E.Wieser, C.Will, J.Yang

Mass Measurements of Neutron-Deficient Yb Isotopes and Nuclear Structure at the Extreme Proton-Rich Side of the N=82 Shell

ATOMIC MASSES 150,151,152,153,154,155,156Yb; measured frequencies, TOF; deduced mass excess values. Comparison with systematics, AME2020 evaluation. TITAN's multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS).

RADIOACTIVITY 151Yb(IT); measured decay products; deduced excitation energy.

doi: 10.1103/PhysRevLett.127.112501
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2021IZ01      Phys.Rev. C 103, 025811 (2021)

C.Izzo, J.Bergmann, K.A.Dietrich, E.Dunling, D.Fusco, A.Jacobs, B.Kootte, G.Kripko-Koncz, Y.Lan, E.Leistenschneider, E.M.Lykiardopoulou, I.Mukul, S.F.Paul, M.P.Reiter, J.L.Tracy, C.Andreoiu, T.Brunner, T.Dickel, J.Dilling, I.Dillmann, G.Gwinner, D.Lascar, K.G.Leach, W.R.Plass, C.Scheidenberger, M.E.Wieser, A.A.Kwiatkowski

Mass measurements of neutron-rich indium isotopes for r-process studies

ATOMIC MASSES 125,126,127,127m,128,128m,129,129m,130,130m,131,131m,132,133,133m,134In; measured time-of-flight spectra using TITAN multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) at ISAC-TRIUMF facility; deduced mass excesses. 127m,128m,129m,130m,131m,133mIn; deduced excitation energies of two isomeric states each in 127In, 128In, 129In, and 131In, and one isomeric state each in 130In and 132In. Comparison with recent measurements, evaluated data in AME-2016 and ENSDF database, and with predictions from theoretical mass models: FRDM2012, HFB-24, WS4, KTUY05, and DZ95. Radioactive indium beams produced in UCx(p, X), E=480 MeV reaction, followed by selective ionization using an ion-guide laser ion source (IG-LIS), and mass separated by ISAC mass separator, and finally sent to MR-TOF-MS system consisting of a helium-filled rf transport system and injection trap, an electrostatic time-of-flight mass analyzer, and a MagneTOF detector. 128,128mIn, 128,128mSn, 128Sb, 128Cs, 128I, 128Te, 128Xe; measured mass spectrum for A=128 nuclei. Systematics of energies of 1/2- isomers in 101,103,105,107,109,111,113,115,117,119,121,123,125,127,129,131,133In. Relevance to future r-process calculations, including the effect of isomers.

doi: 10.1103/PhysRevC.103.025811
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2021MU05      Phys.Rev. C 103, 044320 (2021)

I.Mukul, C.Andreoiu, J.Bergmann, M.Brodeur, T.Brunner, K.A.Dietrich, T.Dickel, I.Dillmann, E.Dunling, D.Fusco, G.Gwinner, C.Izzo, A.Jacobs, B.Kootte, Y.Lan, E.Leistenschneider, E.M.Lykiardopoulou, S.F.Paul, M.P.Reiter, J.L.Tracy, J.Dilling, A.A.Kwiatkowski

Examining the nuclear mass surface of Rb and Sr isotopes in the A ≈ 104 region via precision mass measurements

ATOMIC MASSES 99,100,101,102,103Rb, 99,100,101,102,103,104,105Sr; measured time-of-flight spectra using Multiple-Reflection Time-of-Flight Mass Separator (MR-TOF-MS) at the TITAN-TRIUMF facility; deduced mass excesses, S(2n), S(n), neutron pairing gaps, fractional r-process abundance for Rb and Sr isotopes relative to most abundant isotopes using waiting point approximation. Comparison with previous experimental values, and with AME2016 evaluation. Discussed astrophysical implications for the r-process. Beams of rubidium and strontium isotopes produced in U(p, X), E=480 MeV reaction at the ISAC-TRIUMF facility, followed by ionization using TRIUMF's Resonant Laser Ionization Ion Source (TRILIS) and mass separated using a dipole magnet.

doi: 10.1103/PhysRevC.103.044320
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2021PA44      Phys.Rev. C 104, 065803 (2021)

S.F.Paul, J.Bergmann, J.D.Cardona, K.A.Dietrich, E.Dunling, Z.Hockenbery, C.Hornung, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, Y.Lan, E.Leistenschneider, E.M.Lykiardopoulou, I.Mukul, T.Murbock, W.S.Porter, R.Silwal, M.B.Smith, J.Ringuette, T.Brunner, T.Dickel, I.Dillmann, G.Gwinner, M.MacCormick, M.P.Reiter, H.Schatz, N.A.Smirnova, J.Dilling, A.A.Kwiatkowski

Mass measurements of 60-63Ga reduce x-ray burst model uncertainties and extend the evaluated T=1 isobaric multiplet mass equation

ATOMIC MASSES 60,61,62,63Ga; measured mass spectra using the TITAN multiple-reflection time-of-flight (MR-TOF) mass spectrometer at TRIUMF-ISAC facility; deduced mass excesses and S(p), and compared with previous experimental results and AME2020 evaluation, and theoretical calculations for S(p). Discussed isobaric multiplet mass equation (IMME) for A=60, and systematic trend for A=42-62 even-A nuclei. Relevance of 60,61Ga mass measurements for the rp process in x-ray bursts, and for 60Zn waiting point nucleus. 60,61,62,63Ga isotopes produced in Zr(p, X), E=480 MeV, and selectively ionized by TRIUMF's Resonant Laser Ion Source (TRILIS).

doi: 10.1103/PhysRevC.104.065803
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2020LE06      J.Phys.(London) G47, 045113 (2020)

E.Leistenschneider, R.Klawitter, A.Lennarz, M.Alanssari, J.C.Bale, B.R.Barquest, U.Chowdhury, A.Finlay, A.T.Gallant, B.Kootte, D.Lascar, K.G.Leach, A.J.Mayer, D.Short, C.Andreoiu, G.Gwinner, M.E.Wieser, J.Dilling, A.A.Kwiatkowski

Diversifying beam species through decay and recapture ion trapping: a demonstrative experiment at TITAN-EBIT

RADIOACTIVITY 30Mg, 30Al(β-) [from U(p, X), E=480 MeV]; measured decay products, Eγ, Iγ; deduced γ-ray energies, population and charge-state evolutions and in-trap decay at TITAN-EBIT, identification of daughter species. TRIUMF's ISOL facility, the isotope separator and accelerator (ISAC).

ATOMIC MASSES 30Mg, 30Al; measured ToF-ICR resonance frequencies; deduced atomic mass excesses. Comparison with available data.

doi: 10.1088/1361-6471/ab6ee1
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2020RE04      Phys.Rev. C 101, 025803 (2020)

M.P.Reiter, S.Ayet San Andres, S.Nikas, J.Lippuner, C.Andreoiu, C.Babcock, B.R.Barquest, J.Bollig, T.Brunner, T.Dickel, J.Dilling, I.Dillmann, E.Dunling, G.Gwinner, L.Graham, C.Hornung, R.Klawitter, B.Kootte, A.A.Kwiatkowski, Y.Lan, D.Lascar, K.G.Leach, E.Leistenschneider, G.Martinez-Pinedo, J.E.McKay, S.F.Paul, W.R.Plass, L.Roberts, H.Schatz, C.Scheidenberger, A.Sieverding, R.Steinbrugge, R.Thompson, M.E.Wieser, C.Will, D.Welch

Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first r-process abundance peak in neutron-star merger calculations

ATOMIC MASSES 80,81,82,83,84,85Ga; measured time-of-flight spectra and mass excesses using the Ion Guide Laser Ion Source (IG-LIS) and Multiple-Reflection Time-of-Flight Mass-Spectrometer and isobar separator (MR-TOF-MS) at TRIUMF-TITAN facility; deduced solar r-process abundances for A=70-140. Comparison with AME-2016 values. Systematics of experimental and theoretical S(2n) values for Z=30-33, N=46-57 isotopes.

doi: 10.1103/PhysRevC.101.025803
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2018BA08      Phys.Rev. C 97, 024312 (2018)

C.Babcock, R.Klawitter, E.Leistenschneider, D.Lascar, B.R.Barquest, A.Finlay, M.Foster, A.T.Gallant, P.Hunt, B.Kootte, Y.Lan, S.F.Paul, M.L.Phan, M.P.Reiter, B.Schultz, D.Short, C.Andreoiu, M.Brodeur, I.Dillmann, G.Gwinner, A.A.Kwiatkowski, K.G.Leach, J.Dilling

Mass measurements of neutron-rich indium isotopes toward the N=82 shell closure

ATOMIC MASSES 125,125m,126,126m,127,127m,128,128m,129,129m,130,130mIn; measured time-of-flight ion-cyclotron-resonance frequencies using TRIUMF's Ion Traps for Atomic and Nuclear science experiment (TITAN); deduced mass excesses, and energies of the isomeric states. Comparison with AME-2016 and ENSDF evaluated data. systematics of S(2n) values for N=74-82 Sb, Sn In and Cd nuclei, and those of pairing gaps for N=70-82 Sn and In nuclei.

NUCLEAR REACTIONS U(p, X)125In/125mIn/126In/126mIn/127In/127mIn/128In/128mIn/129In/129mIn/130In/130mIn, E=480 MeV; measured reaction products and time-of-flight spectra for ions at TRIUMF-ISAC facility using Ion Guide Laser Ion ISAC magnetic mass separator, radio frequency quadrupole cooler and buncher (RFQ), a helium-filled Paul trap, and electron beam ion trap (EBIT).

doi: 10.1103/PhysRevC.97.024312
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2018FE02      Phys.Rev.Lett. 120, 062502 (2018)

B.Fenker, A.Gorelov, D.Melconian, J.A.Behr, M.Anholm, D.Ashery, R.S.Behling, I.Cohen, I.Craiciu, G.Gwinner, J.McNeil, M.Mehlman, K.Olchanski, P.D.Shidling, S.Smale, C.L.Warner

Precision Measurement of the β Asymmetry in Spin-Polarized 37K Decay

RADIOACTIVITY 37K(EC); measured decay products, Eβ, Iβ; deduced β asymmetry, limits on the mass of a hypothetical WR coupling to right-handed ν. Comparison with available data.

doi: 10.1103/PhysRevLett.120.062502
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2018LE03      Phys.Rev.Lett. 120, 062503 (2018)

E.Leistenschneider, M.P.Reiter, S.Ayet San Andres, B.Kootte, J.D.Holt, P.Navratil, C.Babcock, C.Barbieri, B.R.Barquest, J.Bergmann, J.Bollig, T.Brunner, E.Dunling, A.Finlay, H.Geissel, L.Graham, F.Greiner, H.Hergert, C.Hornung, C.Jesch, R.Klawitter, Y.Lan, D.Lascar, K.G.Leach, W.Lippert, J.E.McKay, S.F.Paul, A.Schwenk, D.Short, J.Simonis, V.Soma, R.Steinbrugge, S.R.Stroberg, R.Thompson, M.E.Wieser, C.Will, M.Yavor, C.Andreoiu, T.Dickel, I.Dillmann, G.Gwinner, W.R.Plass, C.Scheidenberger, A.A.Kwiatkowski, J.Dilling

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

ATOMIC MASSES 51V, 51,52,53,54,55Ti, 52,53,54,55Cr; measured radio frequencies, TOF; deduced mass excesses. Comparison with the AME16 recommended values.

doi: 10.1103/PhysRevLett.120.062503
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2018RE11      Phys.Rev. C 98, 024310 (2018)

M.P.Reiter, S.Ayet San Andres, E.Dunling, B.Kootte, E.Leistenschneider, C.Andreoiu, C.Babcock, B.R.Barquest, J.Bollig, T.Brunner, I.Dillmann, A.Finlay, G.Gwinner, L.Graham, J.D.Holt, C.Hornung, C.Jesch, R.Klawitter, Y.Lan, D.Lascar, J.E.McKay, S.F.Paul, R.Steinbrugge, R.Thompson, J.L.Tracy, M.E.Wieser, C.Will, T.Dickel, W.R.Plass, C.Scheidenberger, A.A.Kwiatkowski, J.Dilling

Quenching of the N=32 neutron shell closure studied via precision mass measurements of neutron-rich vanadium isotopes

ATOMIC MASSES 52,53,54Cr, 51,52,53Ti, 51,52,53,54,55V; measured multiple-reflection time-of-flight mass-Spectrometer and isobar separator (MR-TOF-MS) spectra, time-of-flight ion-cyclotron-resonance (ToF-ICR) resonances, and mass excesses using TRIUMF Ion Trap for Atomic and Nuclear science (TITAN) penning trap; deduced shell gaps for N=26-35 vanadium and calcium isotopes. Comparison with values in AME-2016. Systematics of S(2n) and half-lives for Z=19-24, N=28-36 nuclides. Discussed the evolution of the N=32 neutron shell closure.

doi: 10.1103/PhysRevC.98.024310
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2018SI30      Phys.Rev. A 98, 052502 (2018)

R.Silwal, A.Lapierre, J.D.Gillaspy, J.M.Dreiling, S.A.Blundell, Dipti, A.Borovik, Jr., G.Gwinner, A.C.C.Villari, Yu.Ralchenko, E.Takacs

Measuring the difference in nuclear charge radius of Xe isotopes by EUV spectroscopy of highly charged Na-like ions

NUCLEAR MOMENTS 124,136Xe; measured frequencies; deduced the difference in the mean-square nuclear charge radius of xenon isotopes. Extreme ultraviolet spectroscopy of highly charged Na-like ions.

doi: 10.1103/PhysRevA.98.052502
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2017BR14      Phys.Rev. C 96, 034316 (2017)

M.Brodeur, A.A.Kwiatkowski, O.M.Drozdowski, C.Andreoiu, D.Burdette, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, G.Gwinner, H.Heggen, J.D.Holt, R.Klawitter, J.Lassen, K.G.Leach, A.Lennarz, C.Nicoloff, S.Raeder, B.E.Schultz, S.R.Stroberg, A.Teigelhofer, R.Thompson, M.Wieser, J.Dilling

Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation

ATOMIC MASSES 27,28,29Mg; measured cyclotron frequencies, mass excesses using TITAN Penning trap at ISAC-TRIUMF facility; deduced S(p). Comparison with AME-2016 evaluated data, and with ab initio calculations from the valence-space in-medium similarity renormalization group. 27,28,29Mg produced in SiC(p, X), E=480 MeV reaction, followed by laser resonance ionization in a radio-frequency ion guide (IG-LIS).29Mg, 29Cl, 30Mg, 30Ar; analyzed isobaric mass multiplet equation (IMME) in the form of a cubic term. 28S, 29Cl; need to confirm mass excess of 28S and S(n) of 29Cl.

doi: 10.1103/PhysRevC.96.034316
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2017GA20      Phys.Rev. C 96, 024325 (2017)

A.T.Gallant, M.Alanssari, J.C.Bale, C.Andreoiu, B.R.Barquest, U.Chowdhury, J.Even, A.Finlay, D.Frekers, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, D.Lascar, K.G.Leach, E.Leistenschneider, A.Lennarz, A.J.Mayer, D.Short, R.Thompson, M.Wieser, D.Lunney, J.Dilling

Mass determination near N=20 for Al and Na isotopes

ATOMIC MASSES 31,32Na, 29,34,35Al; measured cyclotron frequencies and mass excesses by time-of-flight ion-cyclotron-resonance (TOF-ICR) technique using the TITAN Penning trap mass spectrometer at ISAC-TRIUMF; deduced S(2n). Radioactive isotopes produced via the isotope separator on-line (ISOL) technique by a 480-MeV proton beam impinging on a UCx target, followed by the separation of sodium isotopes by surface ionization, and aluminum isotopes by the TRIUMF Resonant Ionization Laser Ion Source (TRILIS). Comparison with previous experimental values and mass evaluations. Systematics of S(2n) values for N=18-25 Na, Mg, and Al isotopic chains.

doi: 10.1103/PhysRevC.96.024325
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2017LA16      Phys.Rev. C 96, 044323 (2017)

D.Lascar, R.Klawitter, C.Babcock, E.Leistenschneider, S.R.Stroberg, B.R.Barquest, A.Finlay, M.Foster, A.T.Gallant, P.Hunt, J.Kelly, B.Kootte, Y.Lan, S.F.Paul, M.L.Phan, M.P.Reiter, B.Schultz, D.Short, J.Simonis, C.Andreoiu, M.Brodeur, I.Dillmann, G.Gwinner, J.D.Holt, A.A.Kwiatkowski, K.G.Leach, J.Dilling

Precision mass measurements of 125-127Cd isotopes and isomers approaching the N=82 closed shell

ATOMIC MASSES 125,125m,126,127,127mCd, 133Cs; measured TOF ion cyclotron resonances, cyclotron frequencies using TITAN-ISOLTRAP-TRIUMF facility; deduced mass excesses. Comparison with AME-2012 evaluated data, and ab initio shell-model calculations using NUSHELLX code, and with IMSRG calculations. The Cd isotopes produced in U(p, F), E=500 MeV protons using uranium carbide target and Ion Guide Laser Ion Source (IG-LIS) at ISAC-TRIUMF facility.

doi: 10.1103/PhysRevC.96.044323
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2017RE10      Phys.Rev. C 96, 052501 (2017)

M.P.Reiter, K.G.Leach, O.M.Drozdowski, S.R.Stroberg, J.D.Holt, C.Andreoiu, C.Babcock, B.Barquest, M.Brodeur, A.Finlay, M.Foster, A.T.Gallant, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, Y.Lan, D.Lascar, E.Leistenschneider, A.Lennarz, S.Paul, R.Steinbrugge, R.I.Thompson, M.Wieser, J.Dilling

High-precision QEC-value measurement of the superallowed β+ emitter 22Mg and an ab initio evaluation of the A=22 isobaric triplet

ATOMIC MASSES 22Mg; measured time-of-flight quadrupole-excitation and Ramsey-excitation resonance spectra using Ion Trap for Atomic and Nuclear Science (TITAN) at TRIUMF; deduced average frequency ratios for the mass measurements. 22Mg, 22Na; deduced mass excesses and Q value for ϵ decay of 22Mg decay to 22Na. Comparison with AME-2016 and Hardy-Towner evaluations. 22Mg, 22Ne, 22Na; deduced new coefficients of the IMME by using state-of-the-art ab initio shell-model calculations of the IAS energies. Relevance to isospin-symmetry-breaking (ISB) correction in superallowed β decays.

doi: 10.1103/PhysRevC.96.052501
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2015CH58      Phys.Rev. C 92, 045803 (2015)

U.Chowdhury, K.G.Leach, C.Andreoiu, A.Bader, M.Brodeur, A.Chaudhuri, A.T.Gallant, A.Grossheim, G.Gwinner, R.Klawitter, A.A.Kwiatkowski, A.Lennarz, T.D.Macdonald, J.Pearkes, B.E.Schultz, J.Dilling

First direct mass measurement of the neutron-deficient nucleus 24Al

ATOMIC MASSES 24Al; measured time-of-flight quadrupole excitation resonance spectrum for 24Al ions, mass excess using TITAN Penning-Trap mass spectrometer and Ion-Guide Laser Ion Source (IG-LIS) at TRIUMF; deduced S(p). Comparison with other data and with AME-2012.

NUCLEAR REACTIONS 23Mg(p, γ)24Al; measured reaction resonance energy of astrophysical interest. Comparison with data from DRAGON at TRIUMF.

doi: 10.1103/PhysRevC.92.045803
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2015KW01      Phys.Rev. C 92, 061301 (2015)

A.A.Kwiatkowski, C.Andreoiu, J.C.Bale, A.Chaudhuri, U.Chowdhury, S.Malbrunot-Ettenauer, A.T.Gallant, A.Grossheim, G.Gwinner, A.Lennarz, T.D.Macdonald, T.J.M.Rauch, B.E.Schultz, S.Seeraji, M.C.Simon, V.V.Simon, D.Lunney, A.Poves, J.Dilling

Observation of a crossover of S2n in the island of inversion from precision mass spectrometry

ATOMIC MASSES 27,29,30,31,32,33,34Al; measured TOF-ICR resonance, mass excess using Ion Trap for Atomic and Nuclear science (TITAN) Penning-trap facility at TRIUMF. Comparison with AME-2012, and previous experimental values. Systematics of S(2n) values for 28,29,30,31,32,33,34,35,36,37Mg, 29,30,31,32,33,34,35,36,37,38Al, comparison of experimental and theoretical values; deduced crossover at N=21 in the island of inversion. Large-scale shell-model calculations.

doi: 10.1103/PhysRevC.92.061301
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2015MA30      Phys.Rev. C 91, 045504 (2015)

S.Malbrunot-Ettenauer, T.Brunner, U.Chowdhury, A.T.Gallant, V.V.Simon, M.Brodeur, A.Chaudhuri, E.Mane, M.C.Simon, C.Andreoiu, G.Audi, J.R.C.Lopez-Urrutia, P.Delheij, G.Gwinner, A.Lapierre, D.Lunney, M.R.Pearson, R.Ringle, J.Ullrich, J.Dilling

Penning trap mass measurements utilizing highly charged ions as a path to benchmark isospin-symmetry breaking corrections in 74Rb

ATOMIC MASSES 74Ga, 74,75,76,85,87Rb; measured cyclotron frequency ratios of Rb isotopes in q=8-12 charge states relative to that of 85Rb using TITAN at TRIUMF-ISAC facility; deduced mass excesses and compared to previous experimental data.

RADIOACTIVITY 74Rb(EC); deduced Q value and logft using mass excess from current and previous studies. Systematics of superallowed β decays of 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb. Discussed test of the isospin-symmetry correction term δC.

NUCLEAR REACTIONS Nb(p, X)74Rb/75Rb/76Rb/78Rb/74Ga, E=500 MeV; measured yields, TOF ion-cyclotron resonances for highly-charged Rb isotopes, TOF of ions with reference to highly-charged 85Rb isotope using TITAN at TRIUMF-ISAC facility.

doi: 10.1103/PhysRevC.91.045504
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2015ZH20      Phys.Rev.Lett. 115, 042501 (2015)

J.Zhang, M.Tandecki, R.Collister, S.Aubin, J.A.Behr, E.Gomez, G.Gwinner, L.A.Orozco, M.R.Pearson, G.D.Sprouse for the FrPNC collaboration

Hyperfine Anomalies in Fr: Boundaries of the Spherical Single Particle Model

NUCLEAR MOMENTS 206,207,209,213,221Fr; measured fluorescence light, sideband frequency; deduced hyperfine splitting of the 7P1/2 state. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.115.042501
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2014BE02      Hyperfine Interactions 225, 115 (2014)

J.A.Behr, A.Gorelov, K.P.Jackson, M.R.Pearson, M.Anholm, T.Kong, R.S.Behling, B.Fenker, D.Melconian, D.Ashery, G.Gwinner

TRINAT: measuring β-decay correlations with laser-trapped atoms

doi: 10.1007/s10751-013-0887-5
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2014CO18      Phys.Rev. A 90, 052502 (2014), Erratum Phys.Rev. A 92, 019902 (2015)

R.Collister, G.Gwinner, M.Tandecki, J.A.Behr, M.R.Pearson, J.Zhang, L.A.Orozco, S.Aubin, E.Gomez, for the FrPNC Collaboration

Isotope shifts in francium isotopes 206-213Fr and 221Fr

ATOMIC PHYSICS 206,207,208,209,210,211,212,213,221Fr; measured radio-frequency sidebands; deduced isotope shifts. Comparison with available data, theoretical calculations.

doi: 10.1103/PhysRevA.90.052502
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2014KW01      Hyperfine Interactions 225, 143 (2014)

A.A.Kwiatkowski, C.Andreoiu, J.C.Bale, T.Brunner, A.Chaudhuri, U.Chowdhury, P.Delheij, S.Ettenauer, D.Frekers, A.T.Gallant, A.Grossheim, G.Gwinner, F.Jang, A.Lennarz, T.Ma, E.Mane, M.R.Pearson, B.E.Schultz, M.C.Simon, V.V.Simon, J.Dilling

TITAN: An ion trap facility for on-line mass measurement experiments

doi: 10.1007/s10751-013-0892-8
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2013CH49      Phys.Rev. C 88, 054317 (2013)

A.Chaudhuri, C.Andreoiu, T.Brunner, U.Chowdhury, S.Ettenauer, A.T.Gallant, G.Gwinner, A.A.Kwiatkowski, A.Lennarz, D.Lunney, T.D.Macdonald, B.E.Schultz, M.C.Simon, V.V.Simon, J.Dilling

Evidence for the extinction of the N=20 neutron-shell closure for 32Mg from direct mass measurements

ATOMIC MASSES 29,30,31Na, 30,31,32,33,34Mg; measured Time-of-flight (TOF) ion-cyclotron resonances using TITAN Penning trap at ISAC-TRIUMF with respect to 16O and 39K references. Comparison with previous experimental data and with AME evaluations. Systematics of S(2n) values for N=18-24 Na and Mg isotopes; and experimental and theoretical neutron shell gap N=20, Z=10-22 nuclei. Discussed magicity of N=20 shell closure.

doi: 10.1103/PhysRevC.88.054317
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2013LI12      Phys.Rev.Lett. 110, 092502 (2013)

G.Li, R.Segel, N.D.Scielzo, P.F.Bertone, F.Buchinger, S.Caldwell, A.Chaudhuri, J.A.Clark, J.E.Crawford, C.M.Deibel, J.Fallis, S.Gulick, G.Gwinner, D.Lascar, A.F.Levand, M.Pedretti, G.Savard, K.S.Sharma, M.G.Sternberg, T.Sun, J.Van Schelt, R.M.Yee, B.J.Zabransky

Tensor Interaction Limit Derived From the α-β-ν(bar) Correlation in Trapped 8Li Ions

RADIOACTIVITY 8Li(β-) [from 7Li(d, p), E=24 MeV]; measured decay products, Eα, Iα; deduced α-β-ν correlation in the Gamow-Teller decay, limit on tensor component contribution.

doi: 10.1103/PhysRevLett.110.092502
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2012GA15      Phys.Rev. C 85, 044311 (2012)

A.T.Gallant, M.Brodeur, T.Brunner, U.Chowdhury, S.Ettenauer, V.V.Simon, E.Mane, M.C.Simon, C.Andreoiu, P.Delheij, G.Gwinner, M.R.Pearson, R.Ringle, J.Dilling

Highly charged ions in Penning traps: A new tool for resolving low-lying isomeric states

ATOMIC MASSES 78,78mRb; measured time-of-flight spectra, frequency ratios relative to 85Rb using TRIUMF-TITAN facility; deduced mass excess of ground state and isomer in 78Rb. Comparison with AME-2003 and ENSDF.

doi: 10.1103/PhysRevC.85.044311
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2012GO29      J.Phys.:Conf.Ser. 387, 012004 (2012)

E.Gomez, S.Aubin, R.Collister, J.A.Behr, G.Gwinner, L.A.Orozco, M.R.Pearson, M.Tandecki, D.Sheng, J.Zhang

The FrPNC Experiment, weak interaction studies in Francium at TRIUMF

doi: 10.1088/1742-6596/387/1/012004
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2012SI10      Phys.Rev. C 85, 064308 (2012)

V.V.Simon, T.Brunner, U.Chowdhury, B.Eberhardt, S.Ettenauer, A.T.Gallant, E.Mane, M.C.Simon, P.Delheij, M.R.Pearson, G.Audi, G.Gwinner, D.Lunney, H.Schatz, J.Dilling

Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A ≈ 100

ATOMIC MASSES 94,97,98Rb, 94,97,98,99Sr; measured time-of-flight and cyclotron frequencies using (TOF-ICR) method with the Penning-trap mass spectrometer TITAN at TRIUMF-ISAC facility; deduced mass excesses. Frequencies ratios measured with reference to 85Rb. Z=36-44, N=55-65; systematics of S(2n) values. Calculated r process abundances as a function of mass number. Discussed astrophysical implications. Comparisons with previous measurements and AME-2003 evaluation.

doi: 10.1103/PhysRevC.85.064308
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2011ET01      Phys.Rev.Lett. 107, 272501 (2011)

S.Ettenauer, M.C.Simon, A.T.Gallant, T.Brunner, U.Chowdhury, V.V.Simon, M.Brodeur, A.Chaudhuri, E.Mane, C.Andreoiu, G.Audi, J.R.C.Lopez-Urrutia, P.Delheij, G.Gwinner, A.Lapierre, D.Lunney, M.R.Pearson, R.Ringle, J.Ullrich, J.Dilling

First Use of High Charge States for Mass Measurements of Short-Lived Nuclides in a Penning Trap

ATOMIC MASSES 74,75,76Rb, 74Ga; measured TOF ion-cyclotron resonances; deduced masses. Penning trap measurements, comparison with mass evaluation.

doi: 10.1103/PhysRevLett.107.272501
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2009PI01      Phys.Rev. C 79, 015501 (2009)

J.R.A.Pitcairn, D.Roberge, A.Gorelov, D.Ashery, O.Aviv, J.A.Behr, P.G.Bricault, M.Dombsky, J.D.Holt, K.P.Jackson, B.Lee, M.R.Pearson, A.Gaudin, B.Dej, C.Hohr, G.Gwinner, D.Melconian

Tensor interaction constraints from β-decay recoil spin asymmetry of trapped atoms

RADIOACTIVITY 80Rb(β+); measured daughter nucleus recoil angular distributions, recoil asymmetry; deduced tensor interaction constraints. Spin-polarized nucleus. Comparison with standard model predictions.

doi: 10.1103/PhysRevC.79.015501
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2006DI22      Int.J. Mass Spectrom. 251, 198 (2006)

J.Dilling, R.Baartman, P.Bricault, M.Brodeur, L.Blomeley, F.Buchinger, J.Crawford, J.R.C.Lopez-Urrutia, P.Delheij, M.Froese, G.P.Gwinner, Z.Ke, J.K.P.Lee, R.B.Moore, V.Ryjkov, G.Sikler, M.Smith, J.Ullrich, J.Vaz, and the TITAN collaboration

Mass measurements on highly charged radioactive ions, a new approach to high precision with TITAN

doi: 10.1016/j.ijms.2006.01.044
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2005RY06      Eur.Phys.J. A 25, Supplement 1, 53 (2005)

V.L.Ryjkov, L.Blomeley, M.Brodeur, P.Grothkopp, M.Smith, P.Bricault, F.Buchinger, J.Crawford, G.Gwinner, J.Lee, J.Vaz, G.Werth, J.Dilling, and the TITAN Collaboration

TITAN project status report and a proposal for a new cooling method of highly charged ions

doi: 10.1140/epjad/i2005-06-122-1
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1996CA02      Nucl.Phys. A598, 61 (1996)

P.Campbell, J.A.Behr, J.Billowes, G.Gwinner, G.D.Sprouse, F.Xu

Magnetic Dipole and Electric Quadrupole Moments of the Neutron-Deficient Bismuth Isotopes

RADIOACTIVITY 202,203,204Bi(EC); measured hfs; deduced hyperfine coupling constants, μ, quadrupole moments, trends around 208Pb. Gas cell spectroscopy, Bi-Ar system.

doi: 10.1016/0375-9474(95)00462-9
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1996SI06      Phys.Rev.Lett. 76, 3522 (1996)

J.E.Simsarian, A.Ghosh, G.Gwinner, L.A.Orozco, G.D.Sprouse, P.A.Voytas

Magneto-Optic Trapping of 210Fr

NUCLEAR REACTIONS 197Au(18O, xn)210Fr, E=100 MeV; measured Eα following 210Fr decay; deduced 210Fr atom production rate. Magneto-optic trapping.

doi: 10.1103/PhysRevLett.76.3522
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1996VO14      Hyperfine Interactions 97/98, 529 (1996)

P.A.Voytas, J.A.Behr, A.Ghosh, G.Gwinner, L.A.Orozco, J.E.Simsarian, G.D.Sprouse, F.Xu

Laser Traps for Radioactive Isotopes

NUCLEAR REACTIONS 197Au(18O, xn)209Fr/210Fr/211Fr, E=115 MeV; measured α-spectra following residual nuclei decay. Laser trapping of radioactive isotopes.


1995CA11      Phys.Lett. 346B, 21 (1995)

P.Campbell, J.Billowes, J.A.Behr, G.Gwinner, G.D.Sprouse, F.Xu

Isotope Shifts of the Neutron-Deficient Bismuth Isotopes: Charge radii systematics across the Z = 82 shell closure

RADIOACTIVITY 202,203Bi(EC), (β+); 204Bi(EC) [from 197Au(11B, xn), E=86 MeV]; measured isotope shifts; deduced hyperfine coupling constants, King plots. 202,203,204,205,206,208Bi deduced mean square charge radii. King plots for Tl, Po isotopes included, other data input. Laser spectroscopy, sensitive gas cell technique.

doi: 10.1016/0370-2693(95)00014-C
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1994BE60      Nucl.Instrum.Methods Phys.Res. A351, 256 (1994)

J.A.Behr, S.B.Cahn, S.B.Dutta, A.Ghosh, G.Gwinner, C.H.Holbrow, L.A.Orozco, G.D.Sprouse, J.Urayama, F.Xu

A Low-Energy Ion Beam from Alkali Heavy-Ion Reaction Products

NUCLEAR REACTIONS 197Au(18O, xn), E=110-115 MeV; measured Eα, Iα; deduced 209,210,211Fr yield vs target temperature. 51V(31P, n2p), E=90 MeV; 51V(32S, 2n2p), E=145 MeV; measured Eγ, Iγ following residuals decay. Ion beam apparatus for alkali atoms transport.

doi: 10.1016/0168-9002(94)91351-X
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1994GW01      Phys.Rev.Lett. 72, 3795 (1994)

G.Gwinner, J.A.Behr, S.B.Cahn, A.Ghosh, L.A.Orozco, G.D.Sprouse, F.Xu

Magneto-Optic Trapping of Radioactive 79Rb

doi: 10.1103/PhysRevLett.72.3795
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1992BE07      Nucl.Instrum.Methods Phys.Res. A311, 224 (1992)

A.Berger, J.Billowes, J.Das, S.Dutta, G.Gwinner, C.H.Holbrow, T.Kuhl, T.Lauritsen, S.L.Rolston, J.Schecker, G.D.Sprouse, F.Xu

A Resonance Cell for On-Line Optical Spectroscopy of Accelerator Produced Radioactive Atoms

NUCLEAR MOMENTS 174,176,178,180Hf; measured isotope shifts. Resonance fluorescence detection.

RADIOACTIVITY 152,154,156,158Yb; measured isotope shifts. Radioactive beams, resonance cell, on-line optical spectroscopy.

doi: 10.1016/0168-9002(92)90868-5
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1992BE48      Hyperfine Interactions 74, 23 (1992)

J.Behr, S.Cahn, J.Das, G.Gwinner, C.H.Holbrow, T.Lauritsen, L.A.Orozco, S.Shang, J.Schecker, G.D.Sprouse, F.Xu

Laser Spectroscopy of Nuclear Reaction Products: Recent results and future prospects

ATOMIC PHYSICS 174,176,178,180Hf; measured fluorescence spectra. Laser spectroscopy, recoil into gas method. Information on 154,152,156,158Yb included.

doi: 10.1007/BF02398613
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