New calculations of the parity nonconservation matrix element for theJπT0+

Abstract

A new calculation of the predominantly isoscalar PNC matrix element between the J π T 0 + 1, 0 − 1 (E x ≈ 8.7 MeV) states in 14 N has been carried out in a (0+1+2+3+4)hω model space with the Warburton-Brown interaction. The magnitude of the PNC matrix element of 0.22 to 0.34 eV obtained with the DDH PNC interaction is substantially suppressed compared with previous calculations in smaller model spaces but shows agreement with the preliminary Seattle experimental data. The calculated sign is opposite to that obtained

Parity mixing of the0+-0−I=1 doublet inZeps1, Adelberger2, Garcı́a3 et al. 1995Phys. Rev. C

“…Now that full 4' shellmodel calculations are becoming feasible, these nuclear structure questions can be fully addressed. A first attempt has recently been reported [49] with results for (H, g) that are in significantly better agreement with experiment. However, even these calculations do not reproduce important parity-conserving observables (such as El transition rates).…”

“…RecentlyHoroi et al[49], stimulated by our results, have presented a more elaborate analysis of parity mixing in the N doublet. In this paper, therefore, we merely outline some of the issues.Egects of unbound single pat-ticle a&ave functionsThe two-body matrix elements ofPNC operators are usually evaluated using harmonic-oscillator (HO) wave functions (see, for example, Ref.…”

“…Our calculations in N agree qualitatively with the simple estimate above, indicating that the PNC matrix element is reduced substantially ( 50'Fo) when more realistic WS wave functions are employed. Horoi et al [49] have recently found comparable efFects in their calculations.…”

“…28 Horoi et al [49] have investigated the efFect of the 3hoi components of the 0&, 1 state, and find that 3k' configurations comprise 15% of the intensity of the 0 wave '(0 + 1 + 2)bc' with bare Kuo 2k' interaction [51].…”

Reaction and proton-removal cross sections ofLi6,Be7Warner1, Cârstoiu2, Brown3 et al. 2006Phys. Rev. C412370View full textAdd to dashboardCite

“…Excitations up to 4hω have been included in this single particle model space for most of the cases. Inclusion of higher nhω excitations with this effective interaction was shown to better describe some experimental observables [33]. Spurious center-of-mass components of the projectile have been suppressed by the usual method [34] of adding a center-of-mass hamiltonian to the nuclear interaction.…”