Angular distribution of tensor polarizations in 2H(α, 5eg.s)p from the sequential decay reaction 2H(α,p)5Heg.s(α)n

Prescher, K.; Bretfeld, W.; Burgmer, W.; Eichner, H.; Helten, H.J.; Klein, H.; Kretzer, H.; Stehle, H.; Wohlfarth, W.W.

doi:10.1016/0375-9474(77)90013-6

Nuclear Physics A

1977

DOI: 10.1016/0375-9474(77)90013-6

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Angular distribution of tensor polarizations in 2H(α, 5eg.s)p from the sequential decay reaction 2H(α,p)5Heg.s(α)n

K. Prescher

W. Bretfeld

W. Burgmer

et al.

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Cited by 12 publications

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“…An arrangement of one detector on one side of the beam and up to six detectors on the other side, centered circularly around the 5 He recoil axis and inside the decay cone of this recoil nucleus, allowed the measurement of four simultaneous a-p coincidences. 7 The condition of observing the sequential decay of [ 5 He(g.s.)] pol , the energy loss of the a particles in the target exit foils, and separation of competing reactions led to a choice of angles 0 3 (lab) = 52°, ^3(lab) =0°, 0rt(lab) = 32.2°, <^(lab) = 180°.…”

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Kinematically Complete Measurement of Cross Sections and Vector Analyzing Powers ofHe4(dpol

Oswald¹,

Burgmer

Gola

et al. 1981

Phys. Rev. Lett.

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Differential cross sections and vector analyzing powers have been measured for the breakup reaction 4 He(df po i, poi)n at E d =18 MeV in a kinematically complete coincidence experiment. The analysis in the framework of the Faddeev theory yields satisfactory agreement between theory and experiment even for the polarization observables. PACS numbers: 24.70.+ S, 25.10.+ S, 25.40.JtThe d-a system is one of the few systems that can be treated as a three-body system in the framework of the Faddeev theory. Three-body calculations of the d-a elastic scattering cross sections have been done successfully by Shanley, 1 Charnomordic, Fayard, and Lamot, 2 and Koike, 3 who also applied his theory to the deuteron breakup induced by a particles. 4 Quite recently, this theory has been applied with good success to a kinematically incomplete polarization experiment at 2£ d = 15 MeV. 5 Since the agreement between theory and experiment is good for these experiments, a kinematically complete polarization experiment seems to be of appreciable interest as a test of refined three-body calculations, as it is expected to provide information on the two-body interaction and the reaction mechanism in a more sensitive way.In this Letter we report on the first coincidencetype experiment with vector-polarized deuterons of the dp! + a -p + a +n reaction. The use of a vector-polarized deuteron beam allows a determination of the differential cross sections do/ dSd£2 3 d£l 4 and of analyzing powers A(S, 0 3 ,

(3) + a(4) +w(5), the polarization of the intermediate state 5 He(g.s.) produced in the first step of the reaction can be determined by measuring an angular correlation between particles 3 and 46.7 ^n nonco pianar geometry. When a polarized beam is used certain polarization transfer coefficients of the first reaction step can be obtained and compared to a theoretical model of this reaction leading to particle unstable states. Results of this aspect of the present experiment will not be discussed here but are presented elsewhere. 8 The experimental setup consisted of an Ortec 2800 scattering chamber with a 4 He gas target cell. An arrangement of one detector on one side of the beam and up to six detectors on the other side, centered circularly around the 5 He recoil axis and inside the decay cone of this recoil nucleus, allowed the measurement of four simultaneous a-p coincidences. 7 The condition of observing the sequential decay of [ 5 He(g.s.)] pol , the energy loss of the a particles in the target exit foils, and separation of competing reactions led to a choice of angles 0 3 (lab) = 52°, ^3(lab) =0°, 0rt(lab) = 32.2°, <^(lab) = 180°. The beam from the polarized ion source LASCO 9 was accelerated by the Super-FN-Tandem Van de Graa...

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confidence: 99%

Kinematically Complete Measurement of Cross Sections and Vector Analyzing Powers ofHe4(dpol

Oswald¹,

Burgmer

Gola

et al. 1981

Phys. Rev. Lett.

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Kinematically complete angular correlation experiments with position insensitive large area detectors

Wick

1982

Nuclear Instruments and Methods in Physics Research

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The tensor polarization of 5Li in the reaction α + d → α + p + n

et al. 1979

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Angular distribution of tensor polarizations in 2H(α, 5eg.s)p from the sequential decay reaction 2H(α,p)5Heg.s(α)n

Cited by 12 publications

References 24 publications

Kinematically Complete Measurement of Cross Sections and Vector Analyzing Powers ofHe4(dpol

Kinematically Complete Measurement of Cross Sections and Vector Analyzing Powers ofHe4(dpol

Kinematically complete angular correlation experiments with position insensitive large area detectors

The tensor polarization of 5Li in the reaction α + d → α + p + n

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