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Roper, C. D.; Tornow, W.; Braun, R. T.; Chen, Q.; Crowell, A. S.; Trotter, D. Gonzalez; Howell, C. R.; Salinas, F.; Setze, R.; Walter, R.L.; Chen, Zemin; Tang, Hongqing; Zhou, Zuying

doi:10.1103/physrevc.72.024605

Cited by 8 publications

(10 citation statements)

References 21 publications

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“…Because our current 12 C library is a significant improvement over previous attempts and uses the new data of Ref. [9], we do not believe that all of the variations seen in Figs. 1 and 2 reflect uncertainties in the PDE correction.…”

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confidence: 81%

“…However, because Ref. [9] left a gap between 7.0 and 7.5 MeV, we supplemented the database with distributions taken from the PSA of Chen and Tornow [11]. This modification also made small but significant changes to the PDE corrections.…”

mentioning

confidence: 99%

“…Therefore, we substituted Legendre polynomial fits to the 12 C A y (θ ) data of Ref. [9] for this regime. This change resulted in small but significant improvements to the PDE corrections.…”

mentioning

confidence: 99%

“…To improve this database, Roper and co-workers [9] gathered 33 distributions of 12 C( n,n) A y (θ ) data from 2.2 to 8.5 MeV.…”

mentioning

confidence: 99%

“…For the intermediate-energy regime, from 6.4 to 8.5 MeV, we first used only the data of Ref. [9] and interpolated between the energies of each distribution linearly. However, because Ref.…”

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confidence: 99%

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Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

2010

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We present new corrections for the polarization-dependent efficiency (PDE), which introduces a false asymmetry into measurements of n-p analyzing power A y (θ) caused by double scattering in the neutron side detectors. To accomplish this, we created a new database of 12 C( n,n) A y (θ) by using a combination of fits to data, phase-shift analysis, and R-matrix analysis. Our recorrection for PDE of previously reported n-p A y (θ) data at 7.6 and 12.0 MeV and new data at 7.6 MeV indicate that we have achieved a superior representation of 12 C( n,n). Our results continue to suggest a possible charge dependence of the pion-nucleon coupling constant.The motivation for collecting high-precision neutronproton (n-p) analyzing power A y (θ ) data is to test the accuracy of nucleon-nucleon (NN) phase-shift analysis (PSA) predictions for this observable. At low energy, n-p A y (θ ) depends greatly on the 3 P 0 , 3 P 1 , and 3 P 2 phase shifts and good-quality data can be useful in constraining these parameters. Nearly two decades ago, Triangle Universities Nuclear Laboratory (TUNL) collected n-p A y (θ ) data at E n = 7.6, 12.0, 14.0, 16.0, and 18.0 MeV [1]. In terms of uncertainties, these data were of similar quality as earlier measurements by Holslin and co-workers [2] at E n = 10.03 MeV. None of these data were of adequate precision to show clear discrepancies with the Nijmegen PSA predictions [3]. Reference [1] also found that data from 14 to 20 MeV probably would not be able to demonstrate discrepancies with NN predictions, since there is less difference between the various theoretical models in this energy range.

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confidence: 81%

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confidence: 99%

mentioning

confidence: 99%

“…To improve this database, Roper and co-workers [9] gathered 33 distributions of 12 C( n,n) A y (θ ) data from 2.2 to 8.5 MeV.…”

mentioning

confidence: 99%

“…For the intermediate-energy regime, from 6.4 to 8.5 MeV, we first used only the data of Ref. [9] and interpolated between the energies of each distribution linearly. However, because Ref.…”

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confidence: 99%

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Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

2010

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MCAS and Nucleon-Nucleus Clusters

Karataglidis

Amos

Fraser

et al. 2019

A New Development at the Intersection of Nuclear Structure and Reaction Theory

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Particle-unstable and weakly-bound light nuclei with a Sturmian approach that preserves the Pauli principle

et al. 2007

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Sturmian theory for nucleon-nucleus scattering is discussed in the presence of all the phenomenological ingredients necessary for the description of weakly-bound (or particleunstable) light nuclear systems. Currently, we use a macroscopic potential model of collective nature. The analysis shows that the couplings to low-energy collective-core excitations are fundamental but they are physically meaningful only if the constraints introduced by the Pauli principle are taken into account. The formalism leads one to discuss a new concept, Pauli hindrance, which appears to be important to understand the structure of weakly-bound and unbound systems. SturmiansSturmians provide the solution of the scattering problems by matrix manipulation and represent an efficient formalism for determination of S-matrix, and scattering wave functions, bound states and resonances [ 1]. They work well with non-local interactions (such as those non localities arising from the effects due to Pauli exchanges). They allow a consistent treatment of Coulomb plus nuclear interactions, as well as the inclusion in the scattering process of coupled-channel (CC) dynamics. This occurs, for instance, when strong coupling to low-lying excitations of the target nucleus have to be taken into account.Consider the Schrödinger equation (E−H o )Ψ E = V Ψ E in the standard (time-independent) way where E is the spectral variable, and Ψ E is the eigenstate. Sturmians, instead, are the eigensolutions of:where E is a parameter. The eigenvalue η i is the potential scale. Thus the spectrum consists of all the potential rescalings that give solution to that equation, for given energy

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Measurements ofAy(θ)forC12

Cited by 8 publications

References 21 publications

Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

MCAS and Nucleon-Nucleus Clusters

Particle-unstable and weakly-bound light nuclei with a Sturmian approach that preserves the Pauli principle

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