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NSR database version of April 11, 2024.

Search: Author = U.Chowdhury

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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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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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2016KL04      Phys.Rev. C 93, 045807 (2016)

R.Klawitter, A.Bader, M.Brodeur, U.Chowdhury, A.Chaudhuri, J.Fallis, A.T.Gallant, A.Grossheim, A.A.Kwiatkowski, D.Lascar, K.G.Leach, A.Lennarz, T.D.Macdonald, J.Pearkes, S.Seeraji, M.C.Simon, V.V.Simon, B.E.Schultz, J.Dilling

Mass measurements of neutron-rich Rb and Sr isotopes

ATOMIC MASSES 98,99,100Rb, 98,99,100,101Sr; measured cyclotron frequency using the time-of-flight ion-cyclotron-resonance technique (TOF-ICR) using TITAN Penning-trap mass spectrometer at ISAC-TRIUMF; deduced mass excesses. Comparison with previous measurements and AME-2012 evaluation. Rb and Sr ions produced in U(p, F), E=480 MeV reaction and separated by a dipole magnet.

doi: 10.1103/PhysRevC.93.045807
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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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2014GA20      Phys.Rev.Lett. 113, 082501 (2014)

A.T.Gallant, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, B.E.Schultz, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, B.A.Brown, A.Magilligan, J.D.Holt, J.Menendez, J.Simonis, A.Schwenk, J.Dilling

Breakdown of the Isobaric Multiplet Mass Equation for the A=20 and 21 Multiplets

ATOMIC MASSES 20,21Mg; measured time-of-flight ion cyclotron resonance; deduced masses. Comparison with shell model calculations, AME2012 mass evaluation.

doi: 10.1103/PhysRevLett.113.082501
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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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2014KW04      Phys.Rev. C 89, 045502 (2014)

A.A.Kwiatkowski, T.Brunner, J.D.Holt, A.Chaudhuri, U.Chowdhury, M.Eibach, J.Engel, A.T.Gallant, A.Grossheim, M.Horoi, A.Lennarz, T.D.Macdonald, M.R.Pearson, B.E.Schultz, M.C.Simon, R.A.Senkov, V.V.Simon, K.Zuber, J.Dilling

New determination of double-β-decay properties on 48Ca High-precision Qββ-value measurement and improved nuclear matrix element calculations

ATOMIC MASSES 48Ca, 48Ti; measured cyclotron-frequencies, resonances using TITAN system consisting of radio frequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion trap (EBIT), and a Penning trap (MPET) at ISAC-TRIUMF facility; deduced Q value for double β decay of 48Ti. Comparison with previous measurements and atomic mass evaluations (AME-2003 and AME-2012).

RADIOACTIVITY 48Ca(2β-); measured precise Q-value using TITAN system at ISAC-TRIUMF facility; calculated ββ nuclear matrix element by including effects of levels outside the valence space in a shell-model; discussed case for a new experiment on double-beta decay of 48Ca.

doi: 10.1103/PhysRevC.89.045502
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2014LE02      Hyperfine Interactions 225, 157 (2014)

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

Electron-capture branching ratio measurements of odd-odd intermediate nuclei in double-beta decay at the TITAN facility

RADIOACTIVITY 116In(β-), (EC); measured decay products, Eγ, Iγ, X-rays; deduced isomers, energy levels, J, π. Comparison with available data.

doi: 10.1007/s10751-013-0893-7
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2014LE20      Phys.Rev.Lett. 113, 082502 (2014)

A.Lennarz, A.Grossheim, K.G.Leach, M.Alanssari, T.Brunner, A.Chaudhuri, U.Chowdhury, J.R.C.Lopez-Urrutia, A.T.Gallant, M.Holl, A.A.Kwiatkowski, J.Lassen, T.D.Macdonald, B.E.Schultz, S.Seeraji, M.C.Simon, C.Andreoiu, J.Dilling, D.Frekers

In-Trap Spectroscopy of Charge-Bred Radioactive Ions

RADIOACTIVITY 124In(β-), 124Cs(EC); measured decay products, Eγ, Iγ, X-rays; deduced isomer yields, T1/2, γ-ray energies, branching ratios. Electron-beam ion trap of the TITAN facility at TRIUMF.

doi: 10.1103/PhysRevLett.113.082502
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2014MA21      Phys.Rev. C 89, 044318 (2014)

T.D.Macdonald, B.E.Schultz, J.C.Bale, A.Chaudhuri, U.Chowdhury, D.Frekers, A.T.Gallant, A.Grossheim, A.A.Kwiatkowski, A.Lennarz, M.C.Simon, V.V.Simon, J.Dilling

Precision Penning-trap measurement to investigate the role of the51Cr (e-, νe) 51V Q value in the gallium anomaly

ATOMIC MASSES 51Cr, 51V; measured cyclotron-frequencies, TOF-ICR resonances using TITAN system consisting of radio frequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion trap (EBIT), and a Penning trap (MPET) at ISAC-TRIUMF facility; deduced Q value for EC decay of 51Cr. Comparison with AME-2012 evaluation. Relevance to solar neutrino experiments SAGE and GALLEX.

RADIOACTIVITY 51Cr(EC); measured precise Q(EC) value using TITAN system for precise mass measurements at ISAC-TRIUMF facility.

doi: 10.1103/PhysRevC.89.044318
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2014SC09      Phys.Rev. C 90, 012501 (2014)

B.E.Schultz, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, J.Dilling

Precision QEC-value measurement of 23Mg for testing the Cabibbo-Kobayashi-Maskawa matrix unitarity

ATOMIC MASSES 23Mg; measured quadrupole and Ramsey resonances, frequency ratios of 23Mg+ to 23Na+ using TITAN Penning-trap mass spectrometer at ISAC-TRIUMF facility; deduced Q value for 23Mg decay. Comparison with AME-2012.

RADIOACTIVITY 23Mg(EC)[from Si(p, X), E=480 MeV]; measured precise mass; deduced Q value, statistical rate function, ft value of mirror β transition. Comparison of Q value with AME-2012 evaluation. Test of the Cabibbo-Kobayashi-Maskawa matrix unitarity.

doi: 10.1103/PhysRevC.90.012501
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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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2013FR13      Phys.Lett. B 722, 233 (2013)

D.Frekers, M.C.Simon, C.Andreoiu, J.C.Bale, M.Brodeur, T.Brunner, A.Chaudhuri, U.Chowdhury, J.R.C.Lopez-Urrutia, P.Delheij, H.Ejiri, S.Ettenauer, A.T.Gallant, V.Gavrin, A.Grossheim, M.N.Harakeh, F.Jang, A.A.Kwiatkowski, J.Lassen, A.Lennarz, M.Luichtl, T.Ma, T.D.Macdonald, E.Mane, D.Robertson, B.E.Schultz, V.V.Simon, A.Teigelhofer, J.Dilling

Penning-trap Q-value determination of the 71Ga(ν, e-)71Ge reaction using threshold charge breeding of on-line produced isotopes

ATOMIC MASSES 71Ga, 71Ge; measured TOF, TOF-ICR, ion cyclotron resonance spectra; deduced Q-value and its uncertainty. TITAN Penning trap at ISAC/TRIUMF, comparison with AME data.

doi: 10.1016/j.physletb.2013.04.019
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2013KW01      Ann.Phys.(Leipzig) 525, 529 (2013)

A.A.Kwiatkowski, A.Chaudhuri, U.Chowdhury, A.T.Gallant, T.D.Macdonald, B.E.Schultz, M.C.Simon, J.Dilling

Mass measurements of singly and highly charged radioactive ions at TITAN: A new QEC-value measurement of 10C

NUCLEAR REACTIONS Ni, O(p, X)10C/10B, E=500 MeV; measured reaction products; deduced yields.

ATOMIC MASSES 10C, 10B, 74Rb; measured cyclotron frequency ratio; deduced Q-value. Comparison with available data.

doi: 10.1002/andp.201300039
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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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2012GA29      Phys.Rev.Lett. 109, 032506 (2012)

A.T.Gallant, J.C.Bale, T.Brunner, U.Chowdhury, S.Ettenauer, A.Lennarz, D.Robertson, V.V.Simon, A.Chaudhuri, J.D.Holt, A.A.Kwiatkowski, E.Mane, J.Menendez, B.E.Schultz, M.C.Simon, C.Andreoiu, P.Delheij, M.R.Pearson, H.Savajols, A.Schwenk, J.Dilling

New Precision Mass Measurements of Neutron-Rich Calcium and Potassium Isotopes and Three-Nucleon Forces

ATOMIC MASSES 51,52Ca, 51K; measured TOF-ICR resonances, average frequency ratios; deduced masses. Comparison with available data. TRIUMF TITAN trap, comparison with available data, KB3G and GXPF1A effective interactions.

doi: 10.1103/PhysRevLett.109.032506
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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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