Evidence for meson-exchange currents in the radiative thermal neutron capture by deuterium nuclei

Konijnenberg, Mark; Abrahams, K.; Kopeckỳ, J.; Stecher‐Rasmussen, F.; Wervelman, R.; Koch, J.H.

doi:10.1016/0370-2693(88)91652-8

Cited by 27 publications

(16 citation statements)

References 7 publications

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“…We compare our prediction for the photon polarization parameter with the theoretical and the experimental results of Ref. [1,7,8] in this table. The magnetic M 1 -transition gives the dominant contribution for our calculation.…”

Section: Resultsmentioning

confidence: 88%

“…The results for the thermal energy cross section and photon polarization parameter are presented in table I and II, along with the experimental data [1,13]. Table I compares Recently in a model dependent two-body current calculation, the total cross section for nd → 3 Hγ is obtained as σ T = 0.523 mb [8].…”

Section: Resultsmentioning

confidence: 99%

“…The study of the three-body nuclear physics involving nucleon-deuteron photodisintegration of 3 He and 3 H as well as the time reversed nucleon radiative capture by deuteron has been investigated in theoretical and experimental works over the past decays. The photon polarization in the reaction neutron-deuteron capture reaction has been measured with polarized thermal neutrons by Konijnenberg et al [1]. In addition the search for three-nucleon force effects in the electromagnetically induced process, come more and more into the focus in the recent years.…”

Section: Introductionmentioning

confidence: 99%

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Neutron-deuteron system and the photon polarization parameter at thermal neutron energies

Sadeghi¹

2007

Phys. Rev. C

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Effective Field Theory(EFT) is, the unique, model independent and systematic low-energy version of QCD for processes involving momenta below the pion mass. A low-energy photo-nuclear observable in three-body systems, photon polarization parameter at thermal neutron energies is calculated by using pionless EFT up to next-to-next to leading order(N 2 LO). In order to make a comparative study of this model, we compared our results for photon polarization parameter with the realistic Argonne v 18 two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions. Three-body currents give small but significant contributions to some of the observables in the neutron-deuteron radiative capture cross section at thermal neutron energies. In this formalism the three-nucleon forces are needed up to N 2 LO for cut-off independent results. Our result converges order by order in low energy expansion and also cut-off independent at this order.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron-deuteron system and the photon polarization parameter at thermal neutron energies

Sadeghi¹

2007

Phys. Rev. C

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“…Both these models are adjusted to reproduce experimental triton binding energy of BE( 3 H) = 8.482 MeV. 0.8574 332.6 ± 0.7 [38] 0.508 ± 0.015 [39] −0.420 ± 0.030 [40] The solution is drawn in solid line in the figure. The above curve fitting procedure turns out to be quite robust.…”

Section: B Magnetic Moments and Thermal Neutron Capturementioning

confidence: 99%

Up toNLO3heavy-baryon chiral perturbation theory calculation for theM1properties

2009

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M1 properties, comprising magnetic moments and radiative capture of thermal neutron observables, are studied in two-and three-nucleon systems. We use meson exchange current derived up to N 3 LO using heavy baryon chiral perturbation theoryà la Weinberg. Calculations have been performed for several qualitatively different realistic nuclear Hamiltonians, which permits us to analyze model dependence of our results. Our results are found to be strongly correlated with the effective range parameters such as binding energies and the scattering lengths. Taking into account such correlations, the results are in good agreement with the experimental data with small model dependence. YOUNG-HO SONG, RIMANTAS LAZAUSKAS, AND TAE-SUN PARK PHYSICAL REVIEW C 79, 064002 (2009) F JM (r) = j J (qr)Y JM (r), (20) F M JL (r) = j L (qr)Y M J L1 (r), where j L (qr) is the spherical Bessel function; Y JM and Y M J L1are spherical and vector-spherical harmonics, respectively; r is a vector describing the particle (nucleon or meson), which interacts with EM field. Then the electric and magnetic multipoles read064002-4 UP TO N 3 LO HEAVY-BARYON CHIRAL . . . PHYSICAL REVIEW C 79, 064002 (2009) E JM = i J + 1 2J + 1 1/2 F M J J −1 (r) − J 2J + 1 1/2 F M J J +1 (r) · j c + qF M J J (r) · j µ .

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“…The types of systematic effects for this experiment are generally very similar to those for p(n, γ )d. However, some of the possible systematic effects for this experiment are larger relative to the parity violating signal due to the need to use a thin target of D 2 . In addition, the circular polarization of the M1 gamma ray is much larger, around 42 % [ 9 ], than in p(n, γ )d, around 0.3 %, and this can also lead to larger systematic effects. Therefore, the measurement of parity violation in d(n, γ )t is actually more difficult than in p(n, γ )d despite the expected order-of-magnitude larger size of the effect.…”

Section: Neutron Depolarization In Deuteriummentioning

confidence: 99%

A gamma polarimeter for neutron polarization measurement in a liquid deuterium target for parity violation in polarized neutron capture on deuterium

Komives¹,

Sint²,

Bowers³

et al. 2005

J. Res. Natl. Inst. Stand. Technol.

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A measurement of the parity-violating gamma asymmetry in n-D capture would yield information on N-N parity violation independent of the n-p system. Since cold neutrons will depolarize in a liquid deuterium target in which the scattering cross section is much larger than the absorption cross section, it will be necessary to quantify the loss of polarization before capture. One way to do this is to use the large circular polarization of the gamma from n-D capture and analyze the circular polarization of the gamma in a gamma polarimeter. We describe the design of this polarimeter.

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Evidence for meson-exchange currents in the radiative thermal neutron capture by deuterium nuclei

Cited by 27 publications

References 7 publications

Neutron-deuteron system and the photon polarization parameter at thermal neutron energies

Neutron-deuteron system and the photon polarization parameter at thermal neutron energies

Up toNLO3heavy-baryon chiral perturbation theory calculation for theM1properties

A gamma polarimeter for neutron polarization measurement in a liquid deuterium target for parity violation in polarized neutron capture on deuterium

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