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Krupp, H.; Hiebert, J. C.; Klages, H. O.; Döll, P.; Hansmeyer, J.; Plischke, P.; Wilczyńskí, J.; Zankel, H.

doi:10.1103/physrevc.30.1810

Cited by 18 publications

(17 citation statements)

References 31 publications

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“…[56] and Ref. [57], respectively. Compared to the 3N -induced results, in this case the N N -only Hamiltonian (accidentally) leads to better agreement with data around 90 degrees while it deteriorates it at larger angles.…”

Section: Cross Sections and Analyzing Powersmentioning

confidence: 99%

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

et al. 2013

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We extend the ab initio no-core shell model/resonating-group method to include three-nucleon (3N ) interactions for the description of nucleon-nucleus collisions. We outline the formalism, give algebraic expressions for the 3N -force integration kernels, and discuss computational aspects of two alternative implementations. The extended theoretical framework is then applied to nucleon-4 He scattering using similarity-renormalization-group (SRG) evolved nucleon-nucleon plus three-nucleon potentials derived from chiral effective field theory. We analyze the convergence properties of the calculated phase shifts and explore their dependence upon the SRG evolution parameter. We include up to six excited states of the 4 He target and find significant effects from the inclusion of the chiral 3N force, e.g., it enhances the spin-orbit splitting between the 3/2 − and 1/2 − resonances and leads to an improved agreement with the phase shifts obtained from an accurate R-matrix analysis of the five-nucleon experimental data. We find remarkably good agreement with measured differential cross sections at various energies, while analyzing powers manifest larger deviations from experiment for certain energies and angles.

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Section: Cross Sections and Analyzing Powersmentioning

confidence: 99%

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

et al. 2013

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“…The polarization of the deuterons is continuously measured by elastic scattering on carbon. Since the polarization transfer in the d+d reaction is well known [22], the polarization of the neutrons can be calculated. The degree of polarization of the neutrons ranged from Pray=0.37 at E,=20MeV to P,,y=0.51 at E, = 35 MeV, with a relative uncertainty of 10% at each [23].…”

Section: Methodsmentioning

confidence: 99%

Radiative capture of polarized neutrons by12C in the energy rangeE n=20?35 MeV

Wicke

Mondry

Smend

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Radiative capture of polarized neutrons by 12C was investigated using a scintillating NE-213 target and three NaI detectors. Angular distributions of the capture gamma photons and analyzing powers were measured at laboratory angles of 55 ~ , 90 ~ and 125 ~ and neutron energies E,=20 to 35 MeV. Capture photons and recoil nuclei were detected in coincidence, the photons being identified by measuring the time of flight and analyzing the pulse shape in the NaI detectors. In the energy range above the centre of the GDR in 13C, a pronounced rise of the forward-backward asymmetry for the 12C(n, 7o) 13C reaction was observed indicating the presence of E2 capture interfering with direct and collective E1 capture. The direct-semidirect (DSD) model of radiative capture does not give a satisfactory description of the experimental results. 24.30.; 25.40. PACS:

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“…It should be pointed out that this proportionality also holds relativistically [12]. Other measurements of neutron-α scattering in this energy range include asymmetry measurements of 15-MeV neutrons doubly scattered from 4 He [13], asymmetry measurements and phase-shift analysis at 25 and 28 MeV [14,15], and 4 He(n,n) 4 He analyzing power in the energy range of 15-50 MeV [16]. Again, it should be emphasized that the differential cross sections re-evaluated in the present paper are the only data in this energy range based on direct measurements of the scattered neutrons.…”

Section: Current Datamentioning

confidence: 99%

Re-evaluation of neutron-He4elastic scattering data near 20 MeV

2011

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Measured differential elastic-scattering cross sections of 17.72-, 20.97-, and 23.72-MeV neutrons from liquid helium-4 were re-evaluated and were corrected for sample-size and multiple-scattering effects by means of a Monte Carlo technique implemented in a more recent code (MCNPX). Results indicate that earlier corrections via the code MAGGIE-2 overestimated the size of multiple-scattering effects by an order of magnitude. The corrected differential cross sections and Legendre coefficients obtained by least-squares fits are given.

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He4(n→,
H. Krupp
¹
,
J. C. Hiebert
²
,
H. O. Klages
³

et al.

Cited by 18 publications

References 31 publications

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

Radiative capture of polarized neutrons by12C in the energy rangeE n=20?35 MeV

Re-evaluation of neutron-He4elastic scattering data near 20 MeV

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He4(n→,H. Krupp1, J. C. Hiebert2, H. O. Klages3 et al.

Cited by 18 publications

References 31 publications

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

Ab initiomany-body calculations of nucleon-4He scattering with three-nucleon forces

Radiative capture of polarized neutrons by12C in the energy rangeE n=20?35 MeV

Re-evaluation of neutron-He4elastic scattering data near 20 MeV

Contact Info

Product

Resources

About

He4(n→,
H. Krupp
¹
,
J. C. Hiebert
²
,
H. O. Klages
³

et al.