Three-body photodisintegration of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

VVe calculated the two-and three-body enhancement factors x2 and x3 of the dipole sum rule of the triton, arising, respectively, from the two-and three-body interactions. %e performed consistent calculations taking the same interactions for the triton wave function and for the sum rule. The magnitudes of x2 and x3 are of the order of 0.80-0.86 and 0.03-0.04, respectively. The calculated integrated cross section and the bremsstrahlung-weighted cross section are linearly correlated to the calculated triton binding energy.After much effort in few-nucleon physics, the importance of the three-body force effect has been well recognized not only for the triton binding energy [1-4],but also for low-energy physical quantities, such as the asymptotic normalization constant [5] and the charge radius [4] of the triton, through linear relationships between these quantities and the binding energy. In addition to the static three-body force effect, the importance of the threebody exchange mechanisms in the He(y, p) H reaction [6] has been pointed out together with the three-body final-state interaction [7]. With this background, we intend to study the three-body current effect in the present paper. For this purpose, we have chosen the triton dipole photoabsorption, because its energy-integrated cross section is free from the final-state interaction. We calculate the integrated cross section (crp) of the triton electric dipole photoabsorption, i.e. , ThomasReiche-Kuhn (TRK) sum rule [8], H =EC+ V+8'. (2) Denoting the nucleon mass by M, and defining the dipole operator D, bywhere H is the total Hamiltonian, expressed as a sum of the kinetic-energy operator K and the two-and threenucleon interactions V and 8'. TABLE I. The results of the triton sum rules. The first column shows the interactions used for calculating the wave functions and the sum rules. TM 700 (800) means the pion cutoff mass is taken to be 700 (800) MeV for the TM three-body force. %ave function Channel BE (MeV) oo (mbMeV)

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“…The experimental value is 2.76+ 0.12 mb in Ref. [19],which almost agrees with our result, and 1.753+ 0.176 mb in Ref. [18].…”

supporting

confidence: 94%

Three-body force effect in triton dipole sum rules

et al. 1991

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“…A serious discrepancy can be seen between different sets of data above 15 MeV while our result agrees with the measurements of Refs. [36,37] and the most recent data of Ref. [40] which favor smaller total cross section above 15 MeV.…”

supporting

confidence: 56%

Measurement of the Doubly-Polarized $\vec{{^3}He}(\vecγ,n)pp$ Reaction at 16.5 MeV and Its Implications for the GDH Sum Rule

Laskaris,

Yan,

Mueller

et al. 2015

Preprint

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We report new measurements of the doubly-polarized photodisintegration of 3 He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three-body channel to the Gerasimov-Drell-Hearn (GDH) integrand were extracted and compared with the state-of-the-art three-body calculations. The calculations, which include the Coulomb interaction and are in good agreement with the results of previous measurements at 12.8 and 14.7 MeV, can no longer describe the cross section results at 16.5 MeV. The GDH integrand was found to be about one standard deviation larger than the maximum value predicted by the theories.

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“…The solid and dashed lines are the calculations by Deltuva et al [22] and Golak et al [23], respectively. The data are from Faul et al [27] and Berman et al [28]. The solid and dashed lines are the calculations by Deltuva et al [22] and Golak et al [23], respectively.…”

mentioning

confidence: 99%