Monte Carlo simulation of the photon-tagger focal-plane electronics at the MAX IV laboratory

Myers, L. S.; Feldman, G.; Fissum, Kevin; Isaksson, L.; Kovash, M. A.; Nathan, Alan M.; Pywell, R. E.; Schrøder, B.

doi:10.1016/j.nima.2013.08.032

Cited by 8 publications

(20 citation statements)

References 10 publications

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“…Also, some of the rate-dependent corrections cannot be determined analytically. We have developed a simulation of the behavior of the focal-plane electronics that allows us to compute the rate-dependent corrections for the exact experimental conditions of the run period being analyzed [8]. The simulation does an excellent job of replicating the real beam…”

Section: Pos(cd12)102mentioning

confidence: 99%

Compton Scattering with Tagged Photons at MAX-lab

Myers¹

2013

Proceedings of the 7th International Workshop on Chiral Dynamics — PoS(CD12)

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The Compton-scattering program at the Tagged Photon Facility at the MAX IV Laboratory is primarily focused on the extraction of the nucleon isoscalar polarizabilities from the 2 H(γ, γ) reaction. In addition to deuterium, measurements have been conducted on 6 Li, 12 C, and 16 O for the purposes of understanding experimental systematics. At this time, we have preliminary cross sections for 12 C(γ, γ) that agree with previously published results. This is a critical first step in establishing our understanding of the absolute normalization of our experiment that is neccessary before reporting 2 H(γ, γ) results.

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Section: Pos(cd12)102mentioning

confidence: 99%

Compton Scattering with Tagged Photons at MAX-lab

Myers¹

2013

Proceedings of the 7th International Workshop on Chiral Dynamics — PoS(CD12)

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“…A typical accidental-corrected scattered-photon spectrum, the GEANT4 simulation of the response function of the detector, and the integration region are shown in Fig. 1 The integrated scattered-photon yield was normalized to the number of photons incident on the target and corrected for rate-dependent factors [29] which were due to the physical overlap of the FP counters. This procedure has been systematically verified in measurements of photon scattering from carbon [30,31].…”

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confidence: 99%

Measurement of Compton Scattering from the Deuteron and an Improved Extraction of the Neutron Electromagnetic Polarizabilities

et al. 2014

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The electromagnetic polarizabilities of the nucleon are fundamental properties that describe its response to external electric and magnetic fields. They can be extracted from Compton-scattering data-and have been, with good accuracy, in the case of the proton. In contradistinction, information for the neutron requires the use of Compton scattering from nuclear targets. Here we report a new measurement of elastic photon scattering from deuterium using quasimonoenergetic tagged photons at the MAX IV Laboratory in Lund, Sweden. These first new data in more than a decade effectively double the world dataset. Their energy range overlaps with previous experiments and extends it by 20 MeV to higher energies. An analysis using Chiral Effective Field Theory with dynamical ∆(1232) degrees of freedom shows the data are consistent with and within the world dataset. After demonstrating that the fit is consistent with the Baldin sum rule, extracting values for the isoscalar nucleon polarizabilities and combining them with a recent result for the proton, we obtain the neutron polarizabilities as αn = [11.55 ± 1.25(stat) ± 0.2(BSR) ± 0.8(th)] × 10 −4 fm 3 and βn = [3.65 ∓ 1.25(stat) ± 0.2(BSR) ∓ 0.8(th)] × 10 −4 fm 3 , with χ 2 = 45.2 for 44 degrees of freedom.

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“…The experiment utilized the Tagged Photon Facility at MAX IV and three of the largest NaI(Tl) detectors in the world. Correction terms to the cross section were determined via Monte Carlo simulations [2,3] and were confirmed by comparisons to the well-known 12 C(γ,γ) 12 C reaction [4]. These results represent the most extensive data on deuteron Compton scattering ever measured and effectively double the world data set.…”

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confidence: 82%

“…3). The collaboration developed and benchmarked a Monte Carlo simulation [2,3] to calculate the correction factors and estimate the uncertainties.…”

Section: Experimental Challengesmentioning

confidence: 99%

Recent Deuteron Compton Scattering Results and Extracted Neutron Polarizabilities

Myers

2016

EPJ Web of Conferences

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Abstract. The COMPTON@MAX-lab collaboration has recently published a new measurement of elastic photon scattering from deuterium using tagged photons at the MAX IV Laboratory [1]. The experiment utilized the Tagged Photon Facility at MAX IV and three of the largest NaI(Tl) detectors in the world. Correction terms to the cross section were determined via Monte Carlo simulations [2,3] and were confirmed by comparisons to the well-known 12 C(γ,γ) 12 C reaction [4]. These results represent the most extensive data on deuteron Compton scattering ever measured and effectively double the world data set. In addition, the energy range overlaps previous experiments and extends nearly 20 MeV higher where the sensitivity to the polarizabilities is enhanced. As a result, we have obtained the neutron polarizabilities as α n =[11.55 ± 1.25(stat) ± 0.2(BSR) ± 0.8(th)] × 10 −4 fm 3 and β n =[3.65 ∓ 1.25(stat) ± 0.2(BSR) ± 0.8(th)] × 10 −4 fm 3 , which represents a 30% reduction in the statistical uncertainty.

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Monte Carlo simulation of the photon-tagger focal-plane electronics at the MAX IV laboratory

Cited by 8 publications

References 10 publications

Compton Scattering with Tagged Photons at MAX-lab

Compton Scattering with Tagged Photons at MAX-lab

Measurement of Compton Scattering from the Deuteron and an Improved Extraction of the Neutron Electromagnetic Polarizabilities

Recent Deuteron Compton Scattering Results and Extracted Neutron Polarizabilities

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