TY - JOUR

T1 - A study of 0° transverse polarization transfer in (p, n) reactions from 12C, 13C and 40Ca at 80 and 50 MeV

AU - Sakai, H.

AU - Okamura, H.

AU - Matsuoka, N.

AU - Shimizu, A.

AU - Suda, T.

AU - Ieiri, M.

AU - Shimizu, H. M.

N1 - Funding Information:
We thank M. Greenfield for helpful discussions and comments on the manuscript. We are grateful to Toru Suzuki for useful discussion and for providing the RPA results of dipole giant resonances in the 4°Ca nucleus. We thank K. Muto for providing us Cohen-Kurath wave functions. This work is supported financially in part by the Grant-in-Aid for Scientific Research No. 6342007 and for Special Project Research on Meson Science of the Ministry of Education, Science and Culture of Japan. This experiment was performed at RCNP under Program Numbers 19A06, 25A26 and 27A04.

PY - 1994/10/17

Y1 - 1994/10/17

N2 - Transverse-polarization-transfer coefficients DNN for the (p, n) reaction at θ = 0° have been measured on 12C, 13C and 40Ca targets at Ep = 80 MeV and the 12C and 13C targets at Ep = 50 MeV. As for the 12C and 13C(p, n) reactions, DNN for the transitions corresponding to the Gamow-Teller type and the Fermi and Gamow-Teller mixed type are compared to distorted-wave Born-approximation calculations. Observed DNN values are reproduced reasonably well by the calculations employing either the effective interactions M3Y or the M3Ym in which VTτ and Vστ are modified. A value for R2 = [σGT(0°)/σF(0°)][B(F)/B(GT)] is deduced by using only the DNN data from the 13C(p, n) reaction, and is roughly consistent with R = 1 55Ep, empirically determined from the cross-section data at 0°. As for the 40Ca(p, n) reaction, the observed value for the giant-dipole-resonance region is DNN = 0.23±0.05, indicating that the spinflip and non-spinflip resonances are unresolved. Utilizing information from higher-energy DNN data, the transition-strength ratio f of non-spinflip to spinflip and DNN(SF) pertinent to spinfli[ transitions have been deduced empirically for the giant-dipole-resonance region. Obtained f and DNN(SF) values are 1.4±0.4 and -0.25±0.10, respectively, and are roughly consistent with the RPA calculations.

AB - Transverse-polarization-transfer coefficients DNN for the (p, n) reaction at θ = 0° have been measured on 12C, 13C and 40Ca targets at Ep = 80 MeV and the 12C and 13C targets at Ep = 50 MeV. As for the 12C and 13C(p, n) reactions, DNN for the transitions corresponding to the Gamow-Teller type and the Fermi and Gamow-Teller mixed type are compared to distorted-wave Born-approximation calculations. Observed DNN values are reproduced reasonably well by the calculations employing either the effective interactions M3Y or the M3Ym in which VTτ and Vστ are modified. A value for R2 = [σGT(0°)/σF(0°)][B(F)/B(GT)] is deduced by using only the DNN data from the 13C(p, n) reaction, and is roughly consistent with R = 1 55Ep, empirically determined from the cross-section data at 0°. As for the 40Ca(p, n) reaction, the observed value for the giant-dipole-resonance region is DNN = 0.23±0.05, indicating that the spinflip and non-spinflip resonances are unresolved. Utilizing information from higher-energy DNN data, the transition-strength ratio f of non-spinflip to spinflip and DNN(SF) pertinent to spinfli[ transitions have been deduced empirically for the giant-dipole-resonance region. Obtained f and DNN(SF) values are 1.4±0.4 and -0.25±0.10, respectively, and are roughly consistent with the RPA calculations.

KW - Nuclear Reactions

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U2 - 10.1016/0375-9474(94)90792-7

DO - 10.1016/0375-9474(94)90792-7

M3 - Article

AN - SCOPUS:0039021766

VL - 579

SP - 45

EP - 61

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

IS - 1-2

ER -