Pion absorption in heavy nuclei

Ransome, R. D.; Morris, C. L.; Cupps, V.R.; Fergerson, R. W.; McGill, J.; Watson, D. L.; Zumbro, J.D.; Ritchie, Barry; Comfort, J. R.; Tinsley, J. R.; Loveman, R. A.; Dawson, S.; Green, A.; Gugelot, P. C.; Moore, C. Fred

doi:10.1103/physrevc.45.r509

Cited by 40 publications

(13 citation statements)

References 25 publications

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“…The first is that the angular distributions for the pp, pd and dd final states are nearly identical in shape, with the pd distribution slightly flatter than the pp distribution, and the dd distribution the flattest of all. This similarity was reported earlier for pd emission from a variety of nuclei by Ransome et al [8] who concluded "that most deuteron emission is probably due to neutron pick-up by protons". Unfortunately, however, the poor angular resolution of the BGO Ball data did not allow this hypothesis to be tested in a more quantitative manner.…”

Section: Monte Carlo Modelssupporting

confidence: 70%

The (π+,pd) and (π+,dd) reactions on light nuclei at 100 and 165 MeV incident pion energies

et al. 2002

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The (π + , pd), and (π + , dd) reactions were investigated with pions of 100 and 165 MeV kinetic energy on 6 Li and 12 C targets. In comparison with previously published (π + , pp) data on the same targets and at the same beam energies, kinematic regions were identified in which the neutron pickup process n+p → d dominated the observed deuteron yield. The importance of this mechanism increases with energy, contributing half of the observed cross section at 165 MeV. The contribution of direct quasi-triton absorption is significant only at 100 MeV.25.80. Ls,25.80.Hp,25.10.+s

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Section: Monte Carlo Modelssupporting

confidence: 70%

The (π+,pd) and (π+,dd) reactions on light nuclei at 100 and 165 MeV incident pion energies

et al. 2002

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“…This is evaluated from differences between external pion interaction data [40][41][42][43][44][45][46][47][48][49][50][51] and the underlying GEANT4 simulation. The external data do not cover the whole momentum range of T2K, so some extrapolation is necessary.…”

Section: Nd280 Detector Systematicsmentioning

confidence: 99%

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

279

376

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We report on measurements of neutrino oscillation using data from the T2K long-baseline neutrino experiment collected between 2010 and 2013. In an analysis of muon neutrino disappearance alone, we find the following estimates and 68% confidence intervals for the two possible mass hierarchies: normal hierarchy∶ sin 2 θ 23 ¼ 0.514 þ0.055 −0.056 and Δm 2 32 ¼ ð2.51 AE 0.10Þ × 10 −3 eV 2 =c 4 and inverted hierarchy∶ sin 2 θ 23 ¼ 0.511 AE 0.055 and Δm 2 13 ¼ ð2.48 AE 0.10Þ × 10 −3 eV 2 =c 4 . The analysis accounts for multinucleon mechanisms in neutrino interactions which were found to introduce negligible bias. We describe our first analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance to estimate four oscillation parameters, jΔm 2 j, sin 2 θ 23 , sin 2 θ 13 , δ CP , and the mass hierarchy. Frequentist and Bayesian intervals are presented for combinations of these parameters, with and without including recent reactor measurements. At 90% confidence level and including reactor measurements, we exclude the region δ CP ¼ ½0.15; 0.83 π for normal hierarchy and δ CP ¼ ½−0.08; 1.09 π for inverted hierarchy. The T2K and reactor data weakly favor the normal hierarchy with a Bayes factor of 2.2. The most probable values and 68% one-dimensional credible intervals for the other oscillation parameters, when reactor data are included, are sin 2 θ 23 ¼ 0.528 þ0.055 −0.038 and jΔm 2 32 j ¼ ð2.51 AE 0.11Þ × 10 −3 eV 2 =c 4 .

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“…ese interactions are known as nal state interactions p → π + n, and absorption on nucleons is simulated. e cross sections for these interactions are tied to several external pion-nucleus scattering measurements [161,[189][190][191].…”

Section: Coherent and Diffractive Pion Productionmentioning

confidence: 99%

Measurement of muon neutrino and antineutrino induced single neutral pion production cross sections

Anderson

2011

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2011Elucidating the nature of neutrino oscillation continues to be a goal in the vanguard of the efforts of physics experiment. As neutrino oscillation searches seek an increasingly elusive signal, a thorough understanding of the possible backgrounds becomes ever more important.Measurements of neutrino-nucleus interaction cross sections are key to this understanding. Searches for ν μ → ν e oscillation-a channel that may yield insight into the vanishingly small mixing parameter θ 13 , CP violation, and the neutrino mass hierarchy-are particularly susceptible to contamination from neutral current single π 0 (NC 1π 0 ) production. Unfortunately, the available data concerning NC 1π 0 production are limited in scope and statistics.Without satisfactory constraints, theoretical models of NC 1π 0 production yield substantially differing predictions in the critical E ν ∼ 1 GeV regime. Additional investigation of this interaction can ameliorate the current de ciencies.e Mini Booster Neutrino Experiment (MiniBooNE) is a short-baseline neutrino oscillation search operating at the Fermi National Accelerator Laboratory (Fermilab). While the oscillation search is the principal charge of the MiniBooNE collaboration, the extensive data (∼ 10 6 neutrino events) offer a rich resource with which to conduct neutrino cross section measurements. is work concerns the measurement of both neutrino and antineutrino NC 1π 0 production cross sections at MiniBooNE. e size of the event samples used in the analysis exceeds that of all other similar experiments combined by an order of magnitude. We present the rst measurements of the absolute NC 1π 0 cross section as well as the rst differential cross sections in both neutrino and antineutrino mode. Speci cally, we measure single differential cross sections with respect to pion momentum and pion angle. We nd the ux-averaged, total cross sections for NC 1π 0 production on CH 2 to be AcknowledgementsImagine my dismay at learning that I did not become the kind of doctor that can order people to take off their pants. Awkward! I must have checked the wrong box on the form.Regardless, it would impolitic of me to fail to acknowledge those I worked (and played) with on my way to becoming a Doctor of Philosophy. e process has been occasionally tedious and quite oen challenging but generally fascinating and always enjoyable. Mathematica, I speak to you as a person because no soware could possibly be so ckle.I liken you to television' s Dr. Gregory House: abrasive and uncooperative to a fault, but always producing beautiful results. I invested countless hours in bending you to my will.Sometimes you would crash in protest and I would lose the day' s work. Well played, Mathematica! Well played, indeed. Aer much struggling, I was able to reliably produce gures in Mathematica, and very oen I would receive compliments for those gures. All told, the ends did justify the means.I am profoundly grateful to the friends in New Haven who provided much needed diversions: Tom, Ethan, Jerry, Kevin, Will, Peter...

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Pion absorption in heavy nuclei

Cited by 40 publications

References 25 publications

The (π+,pd) and (π+,dd) reactions on light nuclei at 100 and 165 MeV incident pion energies

The (π+,pd) and (π+,dd) reactions on light nuclei at 100 and 165 MeV incident pion energies

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Measurement of muon neutrino and antineutrino induced single neutral pion production cross sections

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