skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Evidence of three-body force effects in neutron-deuteron scattering at 95 MeV

Abstract

Recently, we have reported a measurement of the neutron-deuteron elastic scattering differential cross section at 95 MeV. In the present work, the previous results are confirmed with an independent measurement performed with another setup. The new data cover the full angular distribution by combining neutron detection and deuteron detection, and have an unprecedented precision in the region of the cross-section minimum, where three-nucleon forces are expected to be significant. The effect already identified in the previous measurement is clearly seen in the present data, which agree well with theoretical descriptions including three-nucleon forces.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3] more »;  [4];  [5];  [6];  [7] « less
  1. Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala (Sweden)
  2. (Sweden) and Department of Radiation Sciences, Uppsala University (Sweden)
  3. (Sweden) and Svedberg Laboratory, Uppsala University (Sweden)
  4. (Sweden) and Swedish Defence Research Agency (FOI), Stockholm (Sweden)
  5. (Sweden)
  6. (Sweden) and George Washington University, Washington, DC (United States)
  7. (Japan)
Publication Date:
OSTI Identifier:
20771065
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.72.061002; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; ANGULAR DISTRIBUTION; DEUTERIUM TARGET; DEUTERONS; DIFFERENTIAL CROSS SECTIONS; ELASTIC SCATTERING; MEV RANGE; NEUTRON DETECTION; NEUTRON REACTIONS; NEUTRONS; THREE-BODY PROBLEM

Citation Formats

Mermod, P., Blomgren, J., Hildebrand, A., Johansson, C., Klug, J., Oesterlund, M., Pomp, S., Tippawan, U., Bergenwall, B., Nilsson, L., Olsson, N., Jonsson, O., Prokofiev, A., Renberg, P.-U., Nadel-Turonski, P., Maeda, Y., Sakai, H., Tamii, A., Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Svedberg Laboratory, Uppsala University, Department of Radiation Sciences, Uppsala University, and Department of Physics, University of Tokyo. Evidence of three-body force effects in neutron-deuteron scattering at 95 MeV. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.061002.
Mermod, P., Blomgren, J., Hildebrand, A., Johansson, C., Klug, J., Oesterlund, M., Pomp, S., Tippawan, U., Bergenwall, B., Nilsson, L., Olsson, N., Jonsson, O., Prokofiev, A., Renberg, P.-U., Nadel-Turonski, P., Maeda, Y., Sakai, H., Tamii, A., Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Svedberg Laboratory, Uppsala University, Department of Radiation Sciences, Uppsala University, & Department of Physics, University of Tokyo. Evidence of three-body force effects in neutron-deuteron scattering at 95 MeV. United States. doi:10.1103/PhysRevC.72.061002.
Mermod, P., Blomgren, J., Hildebrand, A., Johansson, C., Klug, J., Oesterlund, M., Pomp, S., Tippawan, U., Bergenwall, B., Nilsson, L., Olsson, N., Jonsson, O., Prokofiev, A., Renberg, P.-U., Nadel-Turonski, P., Maeda, Y., Sakai, H., Tamii, A., Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Svedberg Laboratory, Uppsala University, Department of Radiation Sciences, Uppsala University, and Department of Physics, University of Tokyo. Thu . "Evidence of three-body force effects in neutron-deuteron scattering at 95 MeV". United States. doi:10.1103/PhysRevC.72.061002.
@article{osti_20771065,
title = {Evidence of three-body force effects in neutron-deuteron scattering at 95 MeV},
author = {Mermod, P. and Blomgren, J. and Hildebrand, A. and Johansson, C. and Klug, J. and Oesterlund, M. and Pomp, S. and Tippawan, U. and Bergenwall, B. and Nilsson, L. and Olsson, N. and Jonsson, O. and Prokofiev, A. and Renberg, P.-U. and Nadel-Turonski, P. and Maeda, Y. and Sakai, H. and Tamii, A. and Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala and Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala and Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala and Svedberg Laboratory, Uppsala University and Department of Radiation Sciences, Uppsala University and Department of Physics, University of Tokyo},
abstractNote = {Recently, we have reported a measurement of the neutron-deuteron elastic scattering differential cross section at 95 MeV. In the present work, the previous results are confirmed with an independent measurement performed with another setup. The new data cover the full angular distribution by combining neutron detection and deuteron detection, and have an unprecedented precision in the region of the cross-section minimum, where three-nucleon forces are expected to be significant. The effect already identified in the previous measurement is clearly seen in the present data, which agree well with theoretical descriptions including three-nucleon forces.},
doi = {10.1103/PhysRevC.72.061002},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}
  • We have measured the neutron-deuteron (nd) elastic-scattering differential cross section at 95 MeV incident neutron energy, using both the Medley and the SCANDAL setups at TSL in Uppsala. The full angular distribution was covered by detecting recoil deuterons from thin CD2 targets, and the result was normalized to the neutron-proton (np) cross section. Recent theories predict that three-nucleon (3N) force effects, if present, would affect the cross section in the minimum region by about 30%. The results are compared with theoretical calculations and are well described if 3N forces are included.
  • The cross section and several spin-dependent observables have been measured with high precision for the reaction H(d(vector sign),p(vector sign))d at 90 MeV/nucleon. Several calculations were performed based either purely on two-nucleon potentials or also including three-nucleon potentials (3NP). The cross sections are consistent with all calculations including 3NPs. However, no single calculation reproduces the analyzing powers and spin-transfer coefficients, although some spin observables are reproduced to various degrees by the different calculations. A good understanding of the spin structure of 3NP is still lacking.
  • In an experiment with a 65 MeV/nucleon polarized deuteron beam on a liquid-deuterium target at Kernfysisch Versneller Instituut, several multibody final states in deuteron-deuteron scattering were identified. For these measurements, a unique and advanced detection system, called the Big Instrument for Nuclear-polarization Analysis, was utilized. We demonstrate the feasibility of measuring vector and tensor polarization observables of the deuteron break-up reaction leading to a three-body final state. The polarization observables were determined with high precision in a nearly background-free experiment. The analysis procedure and some results are presented.
  • Developments in spin-polarized internal targets for storage rings have permitted measurements of 197 MeV polarized protons scattering from vector polarized deuterons. This work presents measurements of the polarization observables A{sub y}, iT{sub 11}, and C{sub y,y} in proton-deuteron elastic scattering. When compared to calculations with and without three-nucleon forces, the measurements provide further evidence that three-nucleon forces make a contribution to the observables. This work indicates that three-body forces derived from static nuclear properties appear to be crucial to the description of dynamical properties.