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Title: Cross sections and tensor analyzing powers A_yy of the reaction ^1H(|vec|d,pp)n in SCRE geometries at E_d=19 MeV

Abstract

We measured the cross sections and tensor analyzing powers of the 1H({approx}d,pp)n breakup reaction at Ed=19 MeV in four symmetric constant relative energy (SCRE) configurations. The data are compared with theoretical predictions from three different approaches: one based on high precision (semi)phenomenological potentials alone or combined with model three-nucleon forces, another on chiral forces up to next-to-next-to-leading order (NNLO) in the chiral expansion. In both cases, the Coulomb interaction is not included. In addition, a comparison to predictions based on CD Bonn including the Lambda excitation and the Coulomb force is presented. In all cases the measured cross sections are significantly below the theoretical values whereas the magnitude of the tensor analyzing powers agree within the error bars in three of the four cases. The apparent discrepancies in the breakup cross sections are similar to the known differences for the space-star breakup. This adds to the data base of unsolved low-energy discrepancies.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
876569
Report Number(s):
JLAB-THY-06-471; DOE/ER/40150-3786
TRN: US0601212
DOE Contract Number:
AC05-84ER40150
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; BREAKUP REACTIONS; CROSS SECTIONS; EXCITATION; POLARIZATION-ASYMMETRY RATIO

Citation Formats

J. Ley, C. Dueweke, A. Emmerich, A. Imig, H. Paez gen. Schieck, J. Golak, H. Witala, Evgeny Epelbaum, A. Deltuva, A. C. Fonseca, W. Gloeckle, Ulf-G. Meissner, A. Nogga, and P. U. Sauer. Cross sections and tensor analyzing powers A_yy of the reaction ^1H(|vec|d,pp)n in SCRE geometries at E_d=19 MeV. United States: N. p., 2006. Web.
J. Ley, C. Dueweke, A. Emmerich, A. Imig, H. Paez gen. Schieck, J. Golak, H. Witala, Evgeny Epelbaum, A. Deltuva, A. C. Fonseca, W. Gloeckle, Ulf-G. Meissner, A. Nogga, & P. U. Sauer. Cross sections and tensor analyzing powers A_yy of the reaction ^1H(|vec|d,pp)n in SCRE geometries at E_d=19 MeV. United States.
J. Ley, C. Dueweke, A. Emmerich, A. Imig, H. Paez gen. Schieck, J. Golak, H. Witala, Evgeny Epelbaum, A. Deltuva, A. C. Fonseca, W. Gloeckle, Ulf-G. Meissner, A. Nogga, and P. U. Sauer. Wed . "Cross sections and tensor analyzing powers A_yy of the reaction ^1H(|vec|d,pp)n in SCRE geometries at E_d=19 MeV". United States. doi:. https://www.osti.gov/servlets/purl/876569.
@article{osti_876569,
title = {Cross sections and tensor analyzing powers A_yy of the reaction ^1H(|vec|d,pp)n in SCRE geometries at E_d=19 MeV},
author = {J. Ley and C. Dueweke and A. Emmerich and A. Imig and H. Paez gen. Schieck and J. Golak and H. Witala and Evgeny Epelbaum and A. Deltuva and A. C. Fonseca and W. Gloeckle and Ulf-G. Meissner and A. Nogga and P. U. Sauer},
abstractNote = {We measured the cross sections and tensor analyzing powers of the 1H({approx}d,pp)n breakup reaction at Ed=19 MeV in four symmetric constant relative energy (SCRE) configurations. The data are compared with theoretical predictions from three different approaches: one based on high precision (semi)phenomenological potentials alone or combined with model three-nucleon forces, another on chiral forces up to next-to-next-to-leading order (NNLO) in the chiral expansion. In both cases, the Coulomb interaction is not included. In addition, a comparison to predictions based on CD Bonn including the Lambda excitation and the Coulomb force is presented. In all cases the measured cross sections are significantly below the theoretical values whereas the magnitude of the tensor analyzing powers agree within the error bars in three of the four cases. The apparent discrepancies in the breakup cross sections are similar to the known differences for the space-star breakup. This adds to the data base of unsolved low-energy discrepancies.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}
  • We measured the cross sections and tensor analyzing powers of the {sup 1}H(d-vector,pp)n breakup reaction at E{sub d}=19 MeV in four symmetric constant relative energy (SCRE) configurations. The data are compared with theoretical predictions from four different approaches: the first based on high-precision (semi)phenomenological potentials alone or, the second, combined with model three-nucleon forces, and the third based on chiral forces up to next-to-next-to-leading order (NNLO) in the chiral expansion. In these cases the Coulomb interaction is not included. In addition, a fourth approach consists in a comparison with predictions based on CD Bonn including the {delta} excitation and themore » Coulomb force. In all cases the measured cross sections are significantly below the theoretical values, whereas the magnitudes of the tensor analyzing powers agree within the error bars in three of the four cases. The apparent discrepancies in the breakup cross sections are similar to the known differences for the space-star breakup. This adds to the data base of unsolved low-energy discrepancies (puzzles)« less
  • Cross-section and vector-analyzing-power data for three star configurations of the {sup 2}H({ital {rvec p},pp}){ital n} breakup reaction at E{sub p}{sup lab}=65MeV were measured in a kinematically complete experiment. They are compared to rigorous Faddeev calculations involving five realistic charge-dependent nucleon-nucleon potentials: Argonne v{sub 18}, CD Bonn, Nijmegen 93, Nijmegen I, and Nijmegen II. A general satisfactory agreement between theory and experiment has been found. However, there exist also a few minor discrepancies in cross sections in some regions of phase space. The experimental data are compared also to the calculations including the ({pi}-{pi}) Tucson-Melbourne three-body force. Their effects are eithermore » negligible or increase the disagreement with the experiment. {copyright} {ital 1997} {ital The American Physical Society}« less
  • Single arm spectrometer measurements of the differential cross sections and analyzing powers of the pp pn reaction have been performed at 400 and 450 MeV incident proton energy. The measurements covering an angular range from 46 to 90 (lab) spanned pion energies corresponding to production of the np system with relative energies between 0 and 30 MeV, a region where the influence of the np final state interaction is particularly important. The trend of the measured analyzing power is very similar to that of the pp d reaction, and is well explained by calculations that use this latter data asmore » input. Dominance of the triplet pn final state is implied by these results.« less
  • Differential cross sections and vector analyzing powers have been measured for the breakup reaction /sup 4/He(d/sub pol/,p..cap alpha..)n at E/sub d/=18 MeV in a kinematically complete coincidence experiment. The analysis in the framework of the Faddeev theory yields satisfactory agreement between theory and experiment even for the polarization observables.
  • Experimental results for the tensor analyzing powers A/sub xx/ and A/sub yz/ in the /sup 1/H(d-vector, pp)n reaction at 16 MeV for a series of symmetric, constant-relative-energy configurations are reported and compared with the results of recent Faddeev calculations using a separable NN potential. In general, the agreement seems fairly good, although there is some evidence that the measured values of A/sub yz/ tend to be slightly smaller than the prediction, whereas for A/sub xx/ the opposite appears to be true. 1 figure, 1 table. (RWR)