NSR Query Results

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NSR database version of April 27, 2024.

Search: Author = N.Callahan

Found 8 matches.

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2023HO14      Phys.Rev.Lett. 131, 262701 (2023)

D.E.M.Hoff, K.Kolos, G.W.Misch, D.Ray, B.Liu, A.A.Valverde, M.Brodeur, D.P.Burdette, N.Callahan, J.A.Clark, A.T.Gallant, F.G.Kondev, G.E.Morgan, M.R.Mumpower, R.Orford, W.S.Porter, F.Rivero, G.Savard, N.D.Scielzo, K.S.Sharma, K.Sieja, T.M.Sprouse, L.Varriano

Direct Mass Measurements to Inform the Behavior of 128mSb in Nucleosynthetic Environments

ATOMIC MASSES 128,128mSb; measured cyclotron frequencies; deduced mass excesses, isomer excitation energy. Comparison with AME2020, NUBASE2020, state-of-the-art shell model calculations using the GCN5082 interaction. The phase-imaging ion-cyclotron resonance (PI-ICR) technique with the Canadian Penning Trap (CPT) mass spectrometer at the Californium Rare Isotope Breeder Upgrade facility.

doi: 10.1103/PhysRevLett.131.262701
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2022CU09      Phys.Rev. C 106, 065506 (2022)

C.Cude-Woods, F.M.Gonzalez, E.M.Fries, T.Bailey, M.Blatnik, N.B.Callahan, J.H.Choi, S.M.Clayton, S.A.Currie, M.Dawid, B.W.Filippone, W.Fox, P.Geltenbort, E.George, L.Hayen, K.P.Hickerson, M.A.Hoffbauer, K.Hoffman, A.T.Holley, T.M.Ito, A.Komives, C.-Y.Liu, M.Makela, C.L.Morris, R.Musedinovic, C.O'Shaughnessy, R.W.Pattie, J.Ramsey, D.J.Salvat, A.Saunders, E.I.Sharapov, S.Slutsky, V.Su, X.Sun, C.Swank, Z.Tang, W.Uhrich, J.Vanderwerp, P.Walstrom, Z.Wang, W.Wei, A.R.Young

Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

RADIOACTIVITY 1NN(β-); measured number of trapped neutrons; deduced free neutron lifetime T1/2. Comparison to previous most precise experimental data. Asymmetric magneto-gravitational trap at Los Alamos Ultracold Neutron Facility.

doi: 10.1103/PhysRevC.106.065506
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2019CA17      Phys.Rev. C 100, 015501 (2019)

N.Callahan, C.-Y.Liu, F.Gonzalez, E.Adamek, J.D.Bowman, L.Broussard, S.M.Clayton, S.Currie, C.Cude-Woods, E.B.Dees, X.Ding, W.Fox, P.Geltenbort, K.P.Hickerson, M.A.Hoffbauer, A.T.Holley, A.Komives, S.W.T.MacDonald, M.Makela, C.L.Morris, J.D.Ortiz, R.W.Pattie, J.Ramsey, D.J.Salvat, A.Saunders, E.I.Sharapov, S.K.L.Sjue, Z.Tang, J.Vanderwerp, B.Vogelaar, P.L.Walstrom, Z.Wang, H.Weaver, W.Wei, J.Wexler, A.R.Young

Monte Carlo simulations of trapped ultracold neutrons in the UCNt experiment

RADIOACTIVITY 1n(β-); calculated neutron dynamics, trajectory and neutron detection rate in Ultra-cold neutron (UCN) magneto-gravitational neutron trap by developing an in-depth Monte Carlo model for the UCNτ experiments. Discussed implications of chaotic dynamics on controlling the systematic effects, such as spectral cleaning and microphonic heating, for a successful UCN lifetime experiment to reach 0.01% level of precision.

doi: 10.1103/PhysRevC.100.015501
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2018IT01      Phys.Rev. C 97, 012501 (2018)

T.M.Ito, E.R.Adamek, N.B.Callahan, J.H.Choi, S.M.Clayton, C.Cude-Woods, S.Currie, X.Ding, D.E.Fellers, P.Geltenbort, S.K.Lamoreaux, C.-Y.Liu, S.MacDonald, M.Makela, C.L.Morris, R.W.Pattie, J.C.Ramsey, D.J.Salvat, A.Saunders, E.I.Sharapov, S.Sjue, A.P.Sprow, Z.Tang, H.L.Weaver, W.Wei, A.R.Young

Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment

RADIOACTIVITY 1n(β-); measured cold neutron time of arrival (TOA) spectrum, UCN density, dUCNcounts normalized to the UCN monitor detector near the exit of the biological shield using upgraded ultracold neutron (UCN) source at Los Alamos National Laboratory. Discussed implication for a possible neutron electric dipole moment (EDM) experiment.

doi: 10.1103/PhysRevC.97.012501
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2018PA53      Science 360, 627 (2018)

R.W.Pattie, N.B.Callahan, C.Cude-Woods, E.R.Adamek, L.J.Broussard, S.M.Clayton, S.A.Currie, E.B.Dees, X.Ding, E.M.Engel, D.E.Fellers, W.Fox, P.Geltenbort, K.P.Hickerson, M.A.Hoffbauer, A.T.Holley, A.Komives, C.-Y.Liu, S.W.T.MacDonald, M.Makela, C.L.Morris, J.D.Ortiz, J.Ramsey, D.J.Salvat, A.Saunders, S.J.Seestrom, E.I.Sharapov, S.K.Sjue, Z.Tang, J.Vanderwerp, B.Vogelaar, P.L.Walstrom, Z.Wang, W.Wei, H.L.Weaver, J.W.Wexler, T.L.Womack, A.R.Young, B.A.Zeck

Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection

RADIOACTIVITY 1NN(β-); measured T1/2 of free neutron using ultracold neutrons stored in a magneto-gravitational trap at the Los Alamos Neutron Science Center UCN facility. Comparison with previous measurements.

doi: 10.1126/science.aan8895
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2017SE02      Phys.Rev. C 95, 015501 (2017)

S.J.Seestrom, E.R.Adamek, D.Barlow, M.Blatnik, L.J.Broussard, N.B.Callahan, S.M.Clayton, C.Cude-Woods, S.Currie, E.B.Dees, W.Fox, M.Hoffbauer, K.P.Hickerson, A.T.Holley, C.-Y.Liu, M.Makela, J.Medina, D.J.Morley, C.L.Morris, R.W.Pattie, J.Ramsey, A.Roberts, D.J.Salvat, A.Saunders, E.I.Sharapov, S.K.L.Sjue, B.A.Slaughter, P.L.Walstrom, Z.Wang, J.Wexler, T.L.Womack, A.R.Young, J.Vanderwerp, B.A.Zeck

Total cross sections for ultracold neutrons scattered from gases

NUCLEAR REACTIONS 1H, 3He(n, n'), E=ultracold neutrons; measured scattered neutrons, transmission ratio as a function of pressure, total cross sections, total cross section as a function of the number of hydrogen atoms using the following gas targets: hydrogen, ethane, methane, isobutene, n-butane, ethylene, water vapor, propane, neopentane, isopropyl alcohol, and 3He; deduced cross section per hydrogen atom as a function of molecular mass. Relevance to ongoing experiments pn neutron half-life measurements using ultracold neutrons (UCN) at LANL facility.

doi: 10.1103/PhysRevC.95.015501
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2015SE18      Phys.Rev. C 92, 065501 (2015)

S.J.Seestrom, E.R.Adamek, D.Barlow, L.J.Broussard, N.B.Callahan, S.M.Clayton, C.Cude-Woods, S.Currie, E.B.Dees, W.Fox, P.Geltenbort, K.P.Hickerson, A.T.Holley, C.-Y.Liu, M.Makela, J.Medina, D.J.Morley, C.L.Morris, J.Ramsey, A.Roberts, D.J.Salvat, A.Saunders, E.I.Sharapov, S.K.L.Sjue, B.A.Slaughter, B.VornDick, P.L.Walstrom, Z.Wang, T.L.Womack, A.R.Young, B.A.Zeck, for the UCN|t Collaboration

Upscattering of ultracold neutrons from gases

NUCLEAR REACTIONS 1,2H, C, F, N, Ne, Ar, Xe(n, n'), E=UCNs from Los Alamos Neutron Science Center (LANSCE) ultracold neutron source; measured Eγ, Iγ, E(n), I(n), upscattered cross sections for room temperature gas targets of hydrogen, deuterium, nitrogen, neon, argon, xenon, C4H10, CF4, and air. Comparison with experimental values for higher neutron energies, and with theoretical calculations. Relevance to measurement of the half-life of free neutron decay at LANSCE using a magnetogravitational trap.

doi: 10.1103/PhysRevC.92.065501
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2014SA31      Phys.Rev. C 89, 052501 (2014)

D.J.Salvat, E.R.Adamek, D.Barlow, J.D.Bowman, L.J.Broussard, N.B.Callahan, S.M.Clayton, C.Cude-Woods, S.Currie, E.B.Dees, W.Fox, P.Geltenbort, K.P.Hickerson, A.T.Holley, C.-Y.Liu, M.Makela, J.Medina, D.J.Morley, C.L.Morris, S.I.Penttila, J.Ramsey, A.Saunders, S.J.Seestrom, E.I.Sharapov, S.K.L.Sjue, B.A.Slaughter, J.Vanderwerp, B.VornDick, P.L.Walstrom, Z.Wang, T.L.Womack, A.R.Young

Storage of ultracold neutrons in the magneto-gravitational trap of the UCNT experiment

RADIOACTIVITY 1n(β-); measured mean storage times of ultracold neutrons (UCN) in a magneto-gravitational trap at the LANSCE-LANL UCN source, with and without activation of the field; discussed half-life of neutron decay, and systematic effects.

doi: 10.1103/PhysRevC.89.052501
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Note: The following list of authors and aliases matches the search parameter N.Callahan: , N.B.CALLAHAN