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22 results on '"Bignell, L.J."'

1. Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl

Author

Spinks, N.J., Bignell, L.J., Lane, G.J., Akber, A., Barberio, E., Baroncelli, T., Coombes, B.J., Dowie, J.T.H., Eriksen, T.K., Gerathy, M.S.M., Gray, T.J., Mahmood, I., McCormick, B.P., Melbourne, W.J.D., Mitchell, A.J., Nuti, F., Rahman, M.S., Scutti, F., Stuchbery, A.E., Timmers, H., Urquijo, P., Zhong, Y.Y., and Zurowski, M.J.

Published
2023
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2. Monte Carlo simulation of the SABRE PoP background

Author

Antonello, M., Barberio, E., Baroncelli, T., Benziger, J., Bignell, L.J., Bolognino, I., Calaprice, F., Copello, S., D’Angelo, D., D’Imperio, G., Dafinei, I., Di Carlo, G., Diemoz, M., Di Ludovico, A., Duffy, A.R., Froborg, F., Giovanetti, G.K., Hoppe, E., Ianni, A., Ioannucci, L., Krishnan, S., Lane, G.J., Mahmood, I., Mariani, A., McGee, P., Montini, P., Mould, J., Nuti, F., Orlandi, D., Paris, M., Pettinacci, V., Pietrofaccia, L., Prokopovich, D., Rahatlou, S., Rossi, N., Sarbutt, A., Shields, E., Souza, M.J., Stuchbery, A.E., Suerfu, B., Tomei, C., Urquijo, P., Vignoli, C., Wada, M., Wallner, A., Williams, A.G., Xu, J., and Zurowski, M.

Published
2019
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3. Shape polarization in the tin isotopes near N = 60 from precision g-factor measurements on short-lived 11/2− isomers

Author

Gray, T.J., primary, Stuchbery, A.E., additional, Dobaczewski, J., additional, Blazhev, A., additional, Alshammari, H.A., additional, Bignell, L.J., additional, Bonnard, J., additional, Coombes, B.J., additional, Dowie, J.T.H., additional, Gerathy, M.S.M., additional, Kibédi, T., additional, Lane, G.J., additional, McCormick, B.P., additional, Mitchell, A.J., additional, Nicholls, C., additional, Pope, J.G., additional, Reinhard, P.-G., additional, Spinks, N.J., additional, and Zhong, Y., additional

Published
2023
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10. Quenching factor measurements of sodium nuclear recoils in NaI:Tl determined by spectrum fitting

Author

Bignell, L.J., primary, Mahmood, I., additional, Nuti, F., additional, Lane, G.J., additional, Akber, A., additional, Barberio, E., additional, Baroncelli, T., additional, Coombes, B.J., additional, Dix, W., additional, Dowie, J.T.H., additional, Eriksen, T., additional, Gerathy, M.S.M., additional, Gray, T.J., additional, McCormick, B.P., additional, Mitchell, A.J., additional, Rahman, M.S., additional, Scutti, F., additional, Spinks, N.J., additional, Stuchbery, A.E., additional, Timmers, H., additional, Urquijo, P., additional, Wang, L., additional, Zhong, Y.Y., additional, and Zurowski, M.J., additional

Published
2021
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11. Evidence for shape coexistence and superdeformation in 24Mg

Author

Dowie, J.T.H., Kibédi, T., Jenkins, D.G., Stuchbery, A.E., Akber, A., Alshammari, H.A., Aoi, N., Avaa, A., Bignell, L.J., Chisapi, M.V., Coombes, B.J., Eriksen, T.K., Gerathy, M.S.M., Gray, T.J., Hoang, T.H., Ideguchi, E., Jones, P., Kumar Raju, M., Lane, G.J., McCormick, B.P., McKie, L.J., Mitchell, A.J., Spinks, N.J., and Tee, B.P.E.

Published
2020
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12. Monte Carlo simulation of a [sup.198]Au thin foil: the response of a 4[pi][beta]-[gamma] detector

Author

Bignell, L.J., Mo, L., Smith, M.L., Alexiev, D., and Hashemi-Nezhad, S.R.

Subjects
Monte Carlo method -- Usage, Radiation warning systems -- Usage, Gold -- Properties, Business, Electronics, Electronics and electrical industries
Abstract

Monte Carlo simulations have been performed of the decay of a [sup.198]Au solid source within a 4[pi][beta]-[gamma] coincidence detector. Calculations of the proportional counter efficiency to both beta and gamma emissions are simulated. A comparison of results obtained using the MCNP-5 and Geant4 simulation packages indicates that Geant4 better evaluates the K correction to the coincidence equation than MCNP-5 predictions. This difference can be accounted for in terms of how the codes handle the physical interactions occurring in the foil and surrounds. Index Terms--[sup.198]Au, geant4, MCNP, 4[pi][beta]-[gamma] detector.

Published
2008

13. Evidence for shape coexistence and superdeformation in Mg

Author

Dowie, J.T.H., Kibédi, T., Jenkins, D.G., Stuchbery, A.E., Akber, A., Alshammari, H.A., Aoi, N., Avaa, A., Bignell, L.J., Chisapi, M.V., Coombes, B.J., Eriksen, T.K., Gerathy, M.S.M., Gray, T.J., Hoang, T.H., Ideguchi, E., Jones, P., Kumar Raju, M., Lane, G.J., McCormick, B.P., McKie, L.J., Mitchell, A.J., Spinks, N.J., and Tee, B.P.E.

Abstract

The E0 transition depopulating the first-excited 0+ state in $^{24}$Mg has been observed for the first time, and the E0 transition strength determined by electron-positron pair and γ-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is ρ2×103=380(70). A two-state mixing model implies a deformation of the first-excited 0+ state of β2≈1 and a change in the mean-square charge radius of Δ〈r2〉≈1.9fm2, which suggests a significant shape change between the ground state and first-excited 0+ state in $^{24}$Mg. The observed E0 strength gives direct evidence of shape coexistence and superdeformation in $^{24}$Mg, bringing this nucleus into line with similar behaviour in nearby N=Z nuclei. This result agrees with recent theoretical work on the cluster nature of $^{24}$Mg and has potential ramifications for nuclear reactions of astrophysical importance.

Published
2020

14. First measurements with a NaI(Tl) crystal for the SABRE experiment

Author

Mariani, A., primary, Antonello, M., additional, Barberio, E., additional, Baroncelli, T., additional, Benziger, J., additional, Bignell, L.J., additional, Bolognino, I., additional, Calaprice, F., additional, Copello, S., additional, D’Angelo, D., additional, D’Imperio, G., additional, Dafinei, I., additional, Di Carlo, G., additional, Diemoz, M., additional, Di Giacinto, A., additional, Di Ludovico, A., additional, Dix, W., additional, Duffy, A. R., additional, Hoppe, E., additional, Ianni, A., additional, Krishnan, S., additional, Lane, G.J., additional, Mahmood, I., additional, McGee, P., additional, Mould, J., additional, Nuti, F., additional, Orlandi, D., additional, Pettinacci, V., additional, Pietrofaccia, L., additional, Rahatlou, S., additional, Stuchbery, A.E., additional, Suerfu, B., additional, Tomei, C., additional, Urquijo, P., additional, Vignoli, C., additional, Wada, M., additional, Wallner, A., additional, Williams, A.G., additional, and Zurowski, M., additional

Published
2020
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15. The SABRE Proof of Principle

Author

Copello, Simone, primary, Antonello, M., additional, Barberio, E., additional, Baroncelli, T., additional, Benziger, J., additional, Bignell, L.J., additional, Bolognino, I., additional, Calaprice, F., additional, Copello, S., additional, D’Angelo, D., additional, D’Imperio, G., additional, Dafinei, I., additional, Di Carlo, G., additional, Diemoz, M., additional, Di Giacinto, A., additional, Di Ludovico, A., additional, Dix, W., additional, Duffy, A. R., additional, Hoppe, E., additional, Ianni, A., additional, Krishnan, S., additional, Lane, G.J., additional, Mahmood, I., additional, McGee, P., additional, Mould, J., additional, Nuti, F., additional, Orlandi, D., additional, Pettinacci, V., additional, Pietrofaccia, L., additional, Rahatlou, S., additional, Stuchbery, A.E., additional, Suerfu, B., additional, Tomei, C., additional, Urquijo, P., additional, Vignoli, C., additional, Wada, M., additional, Wallner, A., additional, Williams, A.G., additional, and Zurowski, M., additional

Published
2020
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16. The PROSPECT reactor antineutrino experiment

Author

Ashenfelter, J., primary, Balantekin, A.B., additional, Baldenegro, C., additional, Band, H.R., additional, Bass, C.D., additional, Bergeron, D.E., additional, Berish, D., additional, Bignell, L.J., additional, Bowden, N.S., additional, Boyle, J., additional, Bricco, J., additional, Brodsky, J.P., additional, Bryan, C.D., additional, Telles, A. Bykadorova, additional, Cherwinka, J.J., additional, Classen, T., additional, Commeford, K., additional, Conant, A.J., additional, Cox, A.A., additional, Davee, D., additional, Dean, D., additional, Deichert, G., additional, Diwan, M.V., additional, Dolinski, M.J., additional, Erickson, A., additional, Febbraro, M., additional, Foust, B.T., additional, Gaison, J.K., additional, Galindo-Uribarri, A., additional, Gilbert, C.E., additional, Gilje, K.E., additional, Glenn, A., additional, Goddard, B.W., additional, Hackett, B.T., additional, Han, K., additional, Hans, S., additional, Hansell, A.B., additional, Heeger, K.M., additional, Heffron, B., additional, Insler, J., additional, Jaffe, D.E., additional, Ji, X., additional, Jones, D.C., additional, Koehler, K., additional, Kyzylova, O., additional, Lane, C.E., additional, Langford, T.J., additional, LaRosa, J., additional, Littlejohn, B.R., additional, Lopez, F., additional, Lu, X., additional, Caicedo, D.A. Martinez, additional, Matta, J.T., additional, McKeown, R.D., additional, Mendenhall, M.P., additional, Miller, H.J., additional, Minock, J.M., additional, Mueller, P.E., additional, Mumm, H.P., additional, Napolitano, J., additional, Neilson, R., additional, Nikkel, J.A., additional, Norcini, D., additional, Nour, S., additional, Pushin, D.A., additional, Qian, X., additional, Romero-Romero, E., additional, Rosero, R., additional, Sarenac, D., additional, Seilhan, B.S., additional, Sharma, R., additional, Surukuchi, P.T., additional, Trinh, C., additional, Tyra, M.A., additional, Varner, R.L., additional, Viren, B., additional, Wagner, J.M., additional, Wang, W., additional, White, B., additional, White, C., additional, Wilhelmi, J., additional, Wise, T., additional, Yao, H., additional, Yeh, M., additional, Yen, Y.-R., additional, Zhang, A., additional, Zhang, C., additional, Zhang, X., additional, and Zhao, M., additional

Published
2019
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17. Lithium-loaded liquid scintillator production for the PROSPECT experiment

Author

Ashenfelter, J., primary, Balantekin, A.B., additional, Band, H.R., additional, Bass, C.D., additional, Bergeron, D.E., additional, Berish, D., additional, Bignell, L.J., additional, Bowden, N.S., additional, Brodsky, J.P., additional, Bryan, C.D., additional, Reyes, C. Camilo, additional, Campos, S., additional, Cherwinka, J.J., additional, Classen, T., additional, Conant, A.J., additional, Davee, D., additional, Dean, D., additional, Deichert, G., additional, Perez, R. Diaz, additional, Diwan, M.V., additional, Dolinski, M.J., additional, Erickson, A., additional, Febbraro, M., additional, Foust, B.T., additional, Gaison, J.K., additional, Galindo-Uribarri, A., additional, Gilbert, C.E., additional, Hackett, B.T., additional, Hans, S., additional, Hansell, A.B., additional, Hayes, B., additional, Heeger, K.M., additional, Insler, J., additional, Jaffe, D.E., additional, Jones, D.C., additional, Kyzylova, O., additional, Lane, C.E., additional, Langford, T.J., additional, LaRosa, J., additional, Littlejohn, B.R., additional, Lu, X., additional, Martinez Caicedo, D.A., additional, Matta, J.T., additional, McKeown, R.D., additional, Mendenhall, M.P., additional, Mueller, P.E., additional, Mumm, H.P., additional, Napolitano, J., additional, Neilson, R., additional, Nikkel, J.A., additional, Norcini, D., additional, Nour, S., additional, Pushin, D.A., additional, Qian, X., additional, Romero-Romero, E., additional, Rosero, R., additional, Sarenac, D., additional, Surukuchi, P.T., additional, Tyra, M.A., additional, Varner, R.L., additional, Viren, B., additional, White, C., additional, Wilhelmi, J., additional, Wise, T., additional, Yeh, M., additional, Yen, Y.-R., additional, Zhang, A., additional, Zhang, C., additional, and Zhang, X., additional

Published
2019
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18. Strong terahertz emission from (100) p-type InAs

Author

Mendis, R., Smith, M.L., Bignell, L.J., Vickers, R.E.M., and Lewis, R.A.

Subjects
Terahertz radiation -- Analysis, Arsenic compounds -- Atomic properties, Indium -- Atomic properties, Zinc compounds -- Atomic properties, Physics
Abstract

Terahertz is observed from (100) Zn-acceptor-doped InAs under illumination by fs pulses of near-infrared radiation. The emitted terahertz powder has a quadratic variation with the pump power and decreases with increasing temperature.

Published
2005

19. Characterization and modeling of a Water-based Liquid Scintillator

Author

Bignell, L.J., primary, Beznosko, D., additional, Diwan, M.V., additional, Hans, S., additional, Jaffe, D.E., additional, Kettell, S., additional, Rosero, R., additional, Themann, H.W., additional, Viren, B., additional, Worcester, E., additional, Yeh, M., additional, and Zhang, C., additional

Published
2015
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21. Sensitivity and uncertainty analysis of the simulation of 123I and 54Mn gamma and X-ray emissions in a liquid scintillation vial

Author

Bignell, L.J., Mo, L., Alexiev, D., and Hashemi-Nezhad, S.R.

Subjects
*SENSITIVITY analysis, *X-ray spectroscopy, *LIQUID scintillation counting, *PROTON-induced gamma ray emission, *PHOTOMULTIPLIERS, *SIMULATION methods & models, *MONTE Carlo method, *UNCERTAINTY (Information theory), *SCINTILLATION counters
Abstract

Abstract: Radiation transport simulations of the most probable gamma- and X-ray emissions of 123I and 54Mn in a three photomultiplier tube liquid scintillation detector have been carried out. A Geant4 simulation was used to acquire energy deposition spectra and interaction probabilities with the scintillant, as required for absolute activity measurement using the triple to double coincidence ratio (TDCR) method. A sensitivity and uncertainty analysis of the simulation model is presented here. The uncertainty in the Monte Carlo simulation results due to the input parameter uncertainties was found to be more significant than the statistical uncertainty component for a typical number of simulated decay events. The model was most sensitive to changes in the volume of the scintillant. Estimates of the relative uncertainty associated with the simulation outputs due to the combined stochastic and input uncertainties are provided. A Monte Carlo uncertainty analysis of an 123I TDCR measurement indicated that accounting for the simulation uncertainties increases the uncertainty of efficiency of the logical sum of double coincidence by 5.1%. [Copyright &y& Elsevier]

Published
2010
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22. Activity measurements of 3H using the TDCR method and observation of source stability

Author

Mo, L., Bignell, L.J., Steele, T., and Alexiev, D.

Subjects
*RADIOACTIVITY measurements, *COINCIDENCE circuits, *STABILITY (Mechanics), *GATE array circuits, *LIQUID scintillators, *HYDROGEN isotopes
Abstract

Abstract: Activity measurements of 3H were performed using the triple to double coincidence ratio method for the 2009 international comparison organized by the Bureau International des Poids et Mesures (BIPM). The activity obtained by using the FPGA (field programmable gate array) acquisition system and software event analysis was compared to that using MAC3 (Module d’Acquisition de Coincidences triples). Agreement to better than 0.4% was obtained. The stability of sources prepared in Ultima Gold™, Ultima Gold™ LLT, Insta-Gel® Plus and Optiphase “Hisafe”-3 over 140 days is presented. [Copyright &y& Elsevier]

Published
2010
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