Giant spin-isospin vibrations and the continuum spectra from the (p,n) reaction at forward angles

Izumoto, T.

doi:10.1016/0375-9474(83)90095-7

Cited by 34 publications

(25 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this system, the unpolarized cross section is given by 18) due to the relation [32] 19) and the observed polarization transfer coefficients…”

Section: General Formulas For Cross Section and Spin Observablesmentioning

confidence: 99%

“…For such a choice, the orthogonality between the hole and the particle wave functions is destroyed. We therefore utilize the orthogonality condition prescription [19] , details of which are explained in Ref. [38].…”

Section: Spreading Widthsmentioning

confidence: 99%

“…The calculation in the distorted wave impulse approximation (DWIA) for the spin-longitudinal and -transverse cross sections, ID q and ID p , in the continuum was first performed by Ichimura et al [18] for ( p, p ′ ). We utilized the response functions calculated by the continuum random phase approximation (continuum RPA) with orthogonality condition [19] including the ∆ degrees of freedom. We there employed the optimal factorization prescription [20][21][22] to deal with the Fermi motion of the struck nucleon, restricted the spin dependence of the nucleon-nucleon (N N ) t-matrix to the terms with (σ 0 ·q)(σ 1 ·q), and (σ 0 ×q) · (σ 1 ×q) and neglected the interference between the different spin-dependent terms of the N N t-matrix.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distorted wave impulse approximation analysis for spin observables in nucleon quasielastic scattering and enhancement of the spin longitudinal response

et al. 2001

View full text Add to dashboard Cite

We present a formalism of distorted wave impulse approximation (DWIA) for analyzing spin observables in nucleon inelastic and charge exchange reactions leading to the continuum. It utilizes response functions calculated by the continuum random phase approximation (RPA), which include the effective mass, the spreading widths and the ∆ degrees of freedom. The Fermi motion is treated by the optimal factorization, and the non-locality of the nucleon-nucleon t-matrix by an averaged reaction plane approximation. By using the formalism we calculated the spin-longitudinal and the spin-transverse cross sections, IDq and IDp, of 12 C, 40 Ca ( p, n) at 494 and 346 MeV. The calculation reasonably reproduced the observed IDq, which is consistent with the predicted enhancement of the spin-longitudinal response function RL. However, the observed IDp is much larger than the calculated one, which was consistent with neither the predicted quenching nor the spin-transverse response function RT obtained by the (e, e ′ ) scattering. The Landau-Migdal parameter g ′ N∆ for the N ∆ transition interaction and the effective mass at the nuclear center m * (r = 0) are treated as adjustable parameters. The present analysis indicates that the smaller g ′ N∆ (≈ 0.3) and m * (0) ≈ 0.7m are preferable. We also investigate the validity of the plane wave impulse approximation (PWIA) with the effective nucleon number approximation for the absorption, by means of which RL and RT have conventionally been extracted.

show abstract

“…In this system, the unpolarized cross section is given by 18) due to the relation [32] 19) and the observed polarization transfer coefficients…”

Section: General Formulas For Cross Section and Spin Observablesmentioning

confidence: 99%

Section: Spreading Widthsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distorted wave impulse approximation analysis for spin observables in nucleon quasielastic scattering and enhancement of the spin longitudinal response

et al. 2001

View full text Add to dashboard Cite

show abstract

“…However, their analysis used only the LM interaction for nucleons. Most later works with [11,12] used the universality ansatz g NN = g N = g . We re-investigate the GTGR spectrum using the π + ρ + g model interaction without the universality ansatz.…”

mentioning

confidence: 99%

Unified analysis of spin isospin responses of nuclei

2005

View full text Add to dashboard Cite

We investigate the Gamow-Teller (GT) response functions at a momentum transfer of q = 0 fm −1 and the pionic response functions for quasielastic scattering (QES) at q ≈ 1.7 fm −1 using the continuum random phase approximation with the π + ρ + g model interaction. The Landau-Migdal (LM) parameters, g NN and g N , are estimated by comparing the calculations with recent experimental data. The peak of the GT resonance and the pionic response functions below the QES peak constrain g NN , whereas the quenching of the GT total strength and the enhanced pionic strength around the QES peak provide information about g N . We obtained g NN = 0.6 ± 0.1 and g N = 0.35 ± 0.16 at q = 0 fm −1 and g NN = 0.7 ± 0.1 and g N = 0.3 ± 0.1 at q ≈ 1.7 fm −1 . These results indicate that the q dependence of the LM parameters is weak.

show abstract

“…fm 3 . In other, mostly later, treatments [ 103]; [ 104]; [ 105]; [ 106]; the particle-hole interaction was assumed to arise from one-pion plus one-rho exchange, plus a pair correlation function to account for effects of other exchanges. In all these studies it was concluded that the model gave a satisfactory account of the data using reasonable values of model parameters.…”

Section: Strength Distributionmentioning

confidence: 99%