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6 results on '"Pain SD"'

1. Use of Bayesian Optimization to understand the structure of nuclei

Author

Hooker, J, Hooker, J, Kovoor, J, Jones, KL, Kanungo, R, Alcorta, M, Allen, J, Andreoiu, C, Atar, L, Bardayan, DW, Bhattacharjee, SS, Blankstein, D, Burbadge, C, Burcher, S, Catford, WN, Cha, S, Chae, K, Connolly, D, Davids, B, Esker, N, Garcia, FH, Gillespie, S, Ghimire, R, Gula, A, Hackman, G, Hallam, S, Hellmich, M, Henderson, J, Holl, M, Jassal, P, King, S, Knight, T, Kruecken, R, Lepailleur, A, Liang, J, Morrison, L, O'Malley, PD, Pain, SD, Pereira-Lopez, X, Psaltis, A, Radich, A, Shotter, AC, Vostinar, M, Williams, M, Workman, O, Hooker, J, Hooker, J, Kovoor, J, Jones, KL, Kanungo, R, Alcorta, M, Allen, J, Andreoiu, C, Atar, L, Bardayan, DW, Bhattacharjee, SS, Blankstein, D, Burbadge, C, Burcher, S, Catford, WN, Cha, S, Chae, K, Connolly, D, Davids, B, Esker, N, Garcia, FH, Gillespie, S, Ghimire, R, Gula, A, Hackman, G, Hallam, S, Hellmich, M, Henderson, J, Holl, M, Jassal, P, King, S, Knight, T, Kruecken, R, Lepailleur, A, Liang, J, Morrison, L, O'Malley, PD, Pain, SD, Pereira-Lopez, X, Psaltis, A, Radich, A, Shotter, AC, Vostinar, M, Williams, M, and Workman, O

Abstract

Monte Carlo simulations are widely used in nuclear physics to model experimental systems. In cases where there are significant unknown quantities, such as energies of states, an iterative process of simulating and fitting is often required to describe experimental data. We describe a Bayesian approach to fitting experimental data, designed for data from a 12Be(d,p) reaction measurement, using simulations made with GEANT4. Q-values from the 12C(d,p) reaction to well-known states in 13C are compared with simulations using BayesOpt. The energies of the states were not included in the simulation to reproduce the situation for 13Be where the states are poorly known. Both cases had low statistics and significant resolution broadening owing to large proton energy losses in the solid deuterium target. Excitation energies of the lowest three excited states in 13C were extracted to better than 90 keV, paving a way for extracting information on 13Be.

Published
2022

2. Use of Bayesian Optimization to understand the structure of nuclei

Author

Hooker, J, Hooker, J, Kovoor, J, Jones, KL, Kanungo, R, Alcorta, M, Allen, J, Andreoiu, C, Atar, L, Bardayan, DW, Bhattacharjee, SS, Blankstein, D, Burbadge, C, Burcher, S, Catford, WN, Cha, S, Chae, K, Connolly, D, Davids, B, Esker, N, Garcia, FH, Gillespie, S, Ghimire, R, Gula, A, Hackman, G, Hallam, S, Hellmich, M, Henderson, J, Holl, M, Jassal, P, King, S, Knight, T, Kruecken, R, Lepailleur, A, Liang, J, Morrison, L, O'Malley, PD, Pain, SD, Pereira-Lopez, X, Psaltis, A, Radich, A, Shotter, AC, Vostinar, M, Williams, M, Workman, O, Hooker, J, Hooker, J, Kovoor, J, Jones, KL, Kanungo, R, Alcorta, M, Allen, J, Andreoiu, C, Atar, L, Bardayan, DW, Bhattacharjee, SS, Blankstein, D, Burbadge, C, Burcher, S, Catford, WN, Cha, S, Chae, K, Connolly, D, Davids, B, Esker, N, Garcia, FH, Gillespie, S, Ghimire, R, Gula, A, Hackman, G, Hallam, S, Hellmich, M, Henderson, J, Holl, M, Jassal, P, King, S, Knight, T, Kruecken, R, Lepailleur, A, Liang, J, Morrison, L, O'Malley, PD, Pain, SD, Pereira-Lopez, X, Psaltis, A, Radich, A, Shotter, AC, Vostinar, M, Williams, M, and Workman, O

Abstract

Monte Carlo simulations are widely used in nuclear physics to model experimental systems. In cases where there are significant unknown quantities, such as energies of states, an iterative process of simulating and fitting is often required to describe experimental data. We describe a Bayesian approach to fitting experimental data, designed for data from a 12Be(d,p) reaction measurement, using simulations made with GEANT4. Q-values from the 12C(d,p) reaction to well-known states in 13C are compared with simulations using BayesOpt. The energies of the states were not included in the simulation to reproduce the situation for 13Be where the states are poorly known. Both cases had low statistics and significant resolution broadening owing to large proton energy losses in the solid deuterium target. Excitation energies of the lowest three excited states in 13C were extracted to better than 90 keV, paving a way for extracting information on 13Be.

Published
2022

3. Migration of Nuclear Shell Gaps Studied in the d(Ne-24, p gamma)Ne-25 Reaction

Author

Catford, WN, Timis, CN, Lemmon, RC, Labiche, M, Orr, NA, Fernandez-Dominguez, B, Chapman, R, Freer, M, Chartier, M, Savajols, H, Rejmund, M, Achouri, NL, Amzal, N, Ashwood, NI, Baldwin, TD, Burns, M, Caballero, L, Casadjian, JM, Curtis, N, de France, G, Gelletly, W, Liang, X, Pain, SD, Pucknell, VPE, Rubio, B, Sorlin, O, Spohr, K, Theisen, C, Warner, DD, Catford, WN, Timis, CN, Lemmon, RC, Labiche, M, Orr, NA, Fernandez-Dominguez, B, Chapman, R, Freer, M, Chartier, M, Savajols, H, Rejmund, M, Achouri, NL, Amzal, N, Ashwood, NI, Baldwin, TD, Burns, M, Caballero, L, Casadjian, JM, Curtis, N, de France, G, Gelletly, W, Liang, X, Pain, SD, Pucknell, VPE, Rubio, B, Sorlin, O, Spohr, K, Theisen, C, and Warner, DD

Published
2010

4. B(E1) strengths from Coulomb excitation of Be-11

Author

Summers, NC, Pain, SD, Orr, NA, Catford, WN, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Nunes, FM, Soic, N, Stuttge, L, Timis, CN, Thompson, IJ, Winfield, JS, Ziman, V, Summers, NC, Pain, SD, Orr, NA, Catford, WN, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Nunes, FM, Soic, N, Stuttge, L, Timis, CN, Thompson, IJ, Winfield, JS, and Ziman, V

Published
2007

5. Structure of Be-12: Intruder d-wave strength at N=8

Author

Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Winfield, JS, Ziman, V, Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, BR, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, RC, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Winfield, JS, and Ziman, V

Published
2006

6. Evidence of a (1d(5/2))(2) component to the Be-12 ground state

Author

Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, B, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, R, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Ziman, V, Winfield, J, Seweryniak, D, Khoo, TL, Pain, SD, Catford, WN, Orr, NA, Angelique, JC, Ashwood, NI, Bouchat, V, Clarke, NM, Curtis, N, Freer, M, Fulton, B, Hanappe, F, Labiche, M, Lecouey, JL, Lemmon, R, Mahboub, D, Ninane, A, Normand, G, Soic, N, Stuttge, L, Timis, CN, Tostevin, JA, Ziman, V, Winfield, J, Seweryniak, D, and Khoo, TL

Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. The cross sections for the production of 11Be in its ground state (1/2 +) and first excited state (0.32 MeV, 1/2 -) have previously been measured, indicating a strong (2s 1 2) 2 component to the 12Be ground state. In the present experiment, performed at the GANIL laboratory, cross sections for the first (0.32 MeV, 1/2 -) and second (1.78 MeV, 5/2 +, unbound) excited states in 11Be were measured, which gives information on the admixture of (1p 1 2) 2 and (1d 5 2) 2 components in the ground state of 12Be. A fragmentation beam of 12Be of ∼10000 pps (95% pure) was incident on a carbon target at 41 MeV/u. The beam particles were tracked onto the target, and their energies were measured event-by-event. The beam-like residues were measured in a position sensitive telescope mounted at zero degrees, and neutrons were measured in the DéMoN array. The 1/2 - state of 11Be was identified by measuring coincident 320 keV γ-rays, using four NaI detectors. Full kinematic reconstruction of unbound states in 11Be was performed using coincident neutrons and 10Be ions. Detailed simulations were performed in order to interpret the data, and spectroscopic factors were calculated, using preliminary single particle removal cross sections calculated using a Glauber model. © 2005 American Institute of Physics.

Published
2005

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