New Attempt to Determine the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">n</mml:mi><mml:mi mathvariant="italic">−</mml:mi><mml:mi mathvariant="italic">n</mml:mi></mml:math>Scattering Length with the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts

Huhn,; Wätzold, L.; Weber, C.; Siepe, A.; W, von Witsch; Witała, H.; Glöckle, W.

doi:10.1103/physrevlett.85.1190

Cited by 57 publications

(59 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The majority of the breakup experiments were performed in the region of low energies ( < ∼ 25 MeV) for both the nd [18][19][20][21][22][23][24][25][26] and the pd [27][28][29][30][31][32][33][34][35][36] breakup. We compare some of the 13 MeV data with our theoretical predictions for the cross section and nucleon analyzing power A y in Figs.…”

Section: A Energy 13 Mevmentioning

confidence: 99%

Three-nucleon force effects in nucleon induced deuteron breakup. II. Comparison to data

et al. 2002

Self Cite

View full text Add to dashboard Cite

Selected Nd breakup data over a wide energy range are compared to solutions of Faddeev equations based on modern high precision NN interactions alone and adding current three-nucleon force models. Unfortunately currently available data probe phase space regions for the final three nucleon momenta which are rather insensitive to 3NF effects as predicted by current models. Overall there is good to fair agreement between present day theory and experiment but also some cases exist with striking discrepancies. Regions in the phase space are suggested where large 3NF effects can be expected.

show abstract

Section: A Energy 13 Mevmentioning

confidence: 99%

Three-nucleon force effects in nucleon induced deuteron breakup. II. Comparison to data

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…Unfortunately, nn scattering is only poorly known experimentally. There is only one datum for the scattering length, which is still controversal [24,25,26,27,28,29,30,31]. AV18 is adjusted to a nn = −18.82 fm, whereas for CD-Bonn 2000 a nn results in −18.97 fm.…”

mentioning

confidence: 99%

Three-nucleon bound states using realistic potential models

et al. 2003

Self Cite

View full text Add to dashboard Cite

The bound states of 3 H and 3 He have been calculated using the Argonne v18 plus the Urbana threenucleon potential. The isospin T = 3/2 state have been included in the calculations as well as the n-p mass difference. The 3 H-3 He mass difference has been evaluated through the charge dependent terms explicitly included in the two-body potential. The calculations have been performed using two different methods: the solution of the Faddeev equations in momentum space and the expansion on the correlated hyperspherical harmonic basis. The results are in agreement within 0.1% and can be used as benchmark tests. Results for the CD-Bonn interaction are also presented. It is shown that the 3 H and 3 He binding energy difference can be predicted model independently.In the last years great efforts have been made to improve the description of the nucleon-nucleon (N N ) interaction. A new generation of potentials including explicitly charge independence and charge symmetry breaking (CIB,CSB) terms appeared. These interactions describe the N N scattering data below T lab = 300 MeV with a nearly perfect χ 2 /datum≈ 1. The CD-Bonn [1] and Argonne v 18 (AV18) [2] interactions also provide a neutron-neutron (nn) force, which has been adjusted to the experimental nn scattering length, whereas the Nijmegen interactions [3] are fitted only to proton-proton and proton-neutron data. Recently, the CD-Bonn potential has been updated to CD-Bonn 2000 [4]. In this paper we only present results for the AV18 and CD-Bonn 2000 interactions. Both are quite different from each other in their functional form, but their description of the N N data is almost equally accurate. Therefore a comparison of the results will give insights into the model dependence of our understanding of the three-nucleon (3N ) bound states.Following for example the notation of Ref.[2], all these N N potentials can be put in the general formThe short range part v R (N N ) of all of these interactions includes a certain number of parameters (around 40), which are determined by a fitting procedure to the N N scattering data and the deuteron binding energy (BE), whereas the long range part is represented by the one-pion-exchange potential v π (N N ) and an electromagnetic part v EM (N N ). For AV18, v EM (pp) consists of the one-and twophoton Coulomb terms plus the Darwin-Foldy term, vacuum polarization and magnetic moment interactions. The v EM (np) interaction includes a Coulomb term due to the neutron charge distribution in addition to the magnetic moment interaction. Finally, v EM (nn) is given by the magnetic moment interaction only. All these terms take into account the finite size of the nucleon charge distributions. The v EM (N N ) for CD-Bonn is much simpler:is given by the Coulomb force of point protons, whereas v EM (np) = v EM (nn) = 0. As it is well known, when these interactions are used to describe the 3N bound state, an underbinding of about 0.5 MeV to 0.9 MeV depending on the model is obtained (see for example Ref. [5]). The local potentials lead to less bin...

show abstract

“…Because of the possibility of systematic errors that are either underestimated or unaccounted for that are common to all previous experiments, we have made new measurements using a technique that has different sources of systematic errors than previous experiments. Our experiment uses a technique similar to that developed by Huhn et al [17,18] for measuring the nn scattering length. The primary distinctions between our technique and those used in previous SST measurements are: (1) the outgoing proton was detected in coincidence with one of the neutrons, (2) the deuterated target was a thin CD 2 foil to allow outgoing protons to exit the target and have their momentum measured, and (3) the integrated target-beam luminosity was determined by 2 H(n, d)n elastic scattering.…”

mentioning

confidence: 99%

Cross-section measurements of2H(n,np)nin symmetric star configurations

et al. 2012

Self Cite

View full text Add to dashboard Cite

Cross-section measurements have been made at 16 and 19 MeV in two exit-channel configurations of neutron-deuteron breakup: the space-star and coplanar star. In this kinematically-complete measurement, the outgoing proton and one of the neutrons were detected in coincidence and their energies were determined via time-of-flight techniques. Monte-Carlo simulations based on rigorous three-nucleon Faddeev calculations using the CD-Bonn nucleon-nucleon potential were used to compare the experimental results with theory. Large discrepancies between data and theory were found in both breakup configurations measured at both energies, suggesting deficiencies in current theoretical treatment of three-nucleon forces or in present knowledge of the neutron-neutron 1 S0 force.

show abstract

New Attempt to Determine then−nScattering Length with theH2

Cited by 57 publications

References 14 publications

Three-nucleon force effects in nucleon induced deuteron breakup. II. Comparison to data

Three-nucleon force effects in nucleon induced deuteron breakup. II. Comparison to data

Three-nucleon bound states using realistic potential models

Cross-section measurements of2H(n,np)nin symmetric star configurations

Contact Info

Product

Resources

About