Gamow-Teller strength of {sup 90}Nb in the continuum studied via multipole decomposition analysis of the {sup 90}Zr(p,n) reaction at 295 MeV

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.2909· OSTI ID:548775

Wakasa, T; Sakai, H; Okamura, H; Otsu, H; Fujita, S; Ishida, S; Sakamoto, N; Uesaka, T; Satou, Y ^[1]; Greenfield, M B ^[2]; Hatanaka, K ^[3]

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1. Department of Physics, University of Tokyo, Bunkyo, Tokyo 113 (Japan)
2. International Christian University, Mitaka, Tokyo 181 (Japan)
3. Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567 (Japan)

The double differential cross sections at {theta}{sub lab} between 0.0{degree} and 12.3{degree} and the polarization transfer D{sub NN} at 0{degree} for the {sup 90}Zr(p,n) reaction are measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied to the cross sections to extract L=0, L=1, L=2, and L=3 contributions. The Gamow-Teller (GT) strength B(GT) in the continuum deduced from the L=0 cross section is compared both with the perturbative calculation by Bertsch and Hamamoto and with the second-order random phase approximation calculation by Drozdz {ital et al.} The sum of B(GT) values up to 50 MeV excitation becomes S{sub {beta}{sup {minus}}}=28.0{plus_minus}1.6 after subtracting the contribution of the isovector spin-monopole strength. This S{sub {beta}{sup {minus}}} value of 28.0{plus_minus}1.6 corresponds to about (93 {plus_minus} 5){percent} of the minimum value of the sum rule 3(N{minus}Z)=30. The usefulness of the polarization transfer observable in the distorted wave impulse approximation is presented. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 548775
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 55; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DECOMPOSITION
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
GAMOW-TELLER RULES
IMPULSE APPROXIMATION
MONOPOLES
MULTIPOLES
NEUTRONS
NIOBIUM 90
POLARIZATION
PROTON REACTIONS
RANDOM PHASE APPROXIMATION
SPIN
SUM RULES
ZIRCONIUM 90 TARGET