Measurement and semi-phenomenological analysis of the 2H(α, pα)n reaction at 18 MeV

doi:10.1016/0375-9474(78)90209-9

Nuclear Physics A

Volume 299, Issue 1, 17 April 1978, Pages 77-91

https://doi.org/10.1016/0375-9474(78)90209-9 Get rights and content

Abstract

Kinematically complete measurements of the ²(α, pα)n reaction at 18 MeV lab energy have been performed at various pairs of angles θ_p and θ_α. The p-α quasi-free scattering peak cross sections show an angular dependence similar to that predicted in the plane wave impulse approximation. From the analysis in a modified impulse approximation, it is found that two correction terms reflecting the effects of the three-nucleon transfer reaction and ⁶Li resonances are necessary to reproduce the data, as was the case for the 15 MeV ²H(α, pα)n reaction.

References (18)

I. Koersner et al.
Nucl. Phys.
(1977)
K. Sagara et al.
Nucl. Phys.
(1976)
K. Prescher et al.
Nucl. Phys.
(1977)
T. Rausch et al.
Nucl. Phys.
(1974)
R.E. Warner et al.
Nucl. Phys.
(1968)
E. Hourany et al.
Nucl. Phys.
(1974)
H. Nakamura
Nucl. Phys.
(1973)
H. Nakamura
Nucl. Phys.
(1974)
H.D. Knox et al.
Phys. Lett.
(1975)

There are more references available in the full text version of this article.

Cited by (8)

The 4He(d, αp)n reaction at 12 and 17 MeV
1983, Nuclear Physics, Section A
The cross section and the analyzing powers A_y, A_xx and A_yy for the reaction ⁴He( $d$ , αp)n are studied with kinematically complete measurements at incident energies of 12 and 17 MeV. Spectral structures due to the final-state interactions and quasifree scattering are measured. A three-body model of the Faddeev type gives a satisfactory fit to the cross-section and A_y data, but it fails to fit adequately the tensor analyzing-power data. The tensor analyzing powers in the breakup process should be sensitive to the input two-body force, and that sensitivity seems to be somewhat greater near the three-body 1⁺ resonance.
Deuteron breakup by α-particles at 13,15 and 18 MeV
1982, Nuclear Physics, Section A
Kinematically complete measurements on the D(α, αp)n reaction have been made at three low energies for the incident α-particle and for a number of coplanar angular combinations at each energy. The experimental data, which thus cover a substantial phase space volume, provide material for a severe test of low-energy reaction theories. The data have been analysed in a three-body model, which relies on the numerical solution of the Faddeev equations in momentum space. Rank-one separable two-body potentials for the alpha-nucleon and nucleon-nucleon systems have served as the input information.
Agreement between calculated and measured cross sections ranges from excellent to rather poor. Due to the strong effect of the Coulomb correction, which at present is quite uncertain, the appearance of cases with excellent agreement may be fortuitous. The variation of on-shell properties of the two-body potentials produce small changes in the cross sections, implying that more refined models must be employed to achieve good agreement, for instance, the explicit inclusion of effects due to the Pauli principle. However, before firm conclusions in this respect can be drawn, much greater confidence has to be gained in how to treat the Coulomb interaction in few-body breakup reactions.
The reaction 2H(α,αp)n near threshold and excited states of 6Li
1980, Physics Letters B
The reaction ²H(α,αp)n has been studied in a kinematically complete experiment between E_α=9.22 and 11.3 MeV (3.07 to 3.77 MeV in the CM system). Data at the highest energies are dominated by αp and αn final-state interactions and at the same time indicate the relevance of the broad state (J^π=2⁺, T=0) centered at 4.7 MeV in ⁶Li ignored heretofore in theoretical calculations. Possible effects due to three-body forces are discussed.
Breakup of 15 MeV polarized deuterons on 4He
1978, Nuclear Physics, Section A
Differential cross sections and vector analyzing powers have been measured for the $^{4} He(d, P)^{4} He n$ reaction at E_d = 15 MeV for twelve angles between 15° and 85°. The most prominent feature of the cross sections as a function of proton energy is the maximum corresponding to the n-⁴He interaction in the ⁵He ground state. The vector analyzing power is for the most part negative, with a broad minimum in the vicinity of the peak in the cross section. An analysis of the data has been made using the modified impulse approximation. The theory succeeds fairly well in reproducing the cross-section data for angles up to 40°. For larger angles, the magnitude of the calculated cross section is too large for small ifE_p. The negative analyzing power is also predicted, but the agreement with the measured energy variation is in need of improvement at some angles.
The 2H(α, pα)n reaction at 7.5-7.9 MeV c.m. energies
1978, Nuclear Physics, Section A
The ²H(α, pα)n reaction at 7.5–7.9 MeV c.m. energies has been analyzed by the use of the modified impulse approximation. All the experimental data have been reproduced reasonably well by the same approach as for the 10 MeV case and the destructive interference of the n-p final state interaction has again been clearly observed as in the 6 MeV case. Some inferences for reaction mechanism are presented.
Deuteron breakup by 140 MeV alpha particles at quasifree scattering conditions
1982, Physical Review C

View all citing articles on Scopus

^☆: Research supported in part by Nishina Memorial Foundation.

View full text

Article preview

Nuclear Physics A

Abstract

References (18)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Cited by (8)

The <sup>4</sup>He(d, αp)n reaction at 12 and 17 MeV

Deuteron breakup by α-particles at 13,15 and 18 MeV

The reaction <sup>2</sup>H(α,αp)n near threshold and excited states of <sup>6</sup>Li

Breakup of 15 MeV polarized deuterons on <sup>4</sup>He

The <sup>2</sup>H(α, pα)n reaction at 7.5-7.9 MeV c.m. energies

Deuteron breakup by 140 MeV alpha particles at quasifree scattering conditions

Measurement and semi-phenomenological analysis of the 2H(α, pα)n reaction at 18 MeV☆

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Measurement and semi-phenomenological analysis of the ²H(α, pα)n reaction at 18 MeV☆