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[sup 2]H([ital d],[gamma])[sup 4]He polarization observables at 20, 30, and 50 MeV

Journal Article · · Physical Review, C (Nuclear Physics); (United States)
;  [1]; ;  [2];  [3]
  1. Triangle Universities Nuclear Laboratory and Duke University, Durham, North Carolina 27706 (United States)
  2. National Institute of Science and Technology, Gaithersburg, Maryland 20899 (United States)
  3. Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
+ Show Author Affiliations

Tensor and vector analyzing powers for the [sup 2]H([ital d],[gamma])[sup 4]He reaction have been obtained as a function of angle at [ital E][sub [ital d]](lab)=20, 30, and 50 MeV. Differential cross sections were extracted at 30 and 50 MeV. Data for [ital A][sub [ital y][ital y]]([theta]) and [ital A][sub [ital y]]([theta]) were obtained at all three energies, while [ital T][sub 20]([theta]) was also measured at [ital E][sub [ital d]](lab)=50 MeV. A direct capture calculation was performed and compared to the data. This calculation assumes point deuterons and that the reaction proceeds primarily via $[ital E]2$ radiation in this region. A value of 4% for the [ital D] state probability arising from two-deuteron relative motion in the [sup 4]He wave function was extracted by fitting the predictions of this model to the data. This calculation indicates that [ital g]-wave capture is significant at the energies of the present experiment, a result which is supported by a transition-matrix element analysis of the data. The results of a microscopic 7-channel resonating group model (MCRGM) calculation are also compared to the data. This model takes all amplitudes having incoming angular momenta [ital l][le]2 into account as well as the couplings to the [ital n]-[sup 3]He and [ital p]-[ital T] channels. This microscopic calculation, which has produced reasonable agreement with the previous low energy data, predicts a value of 2.2% for the two-deuteron component of the [ital D] state in [sup 4]He. There is qualitative agreement with the present data.

DOE Contract Number:
FG05-91ER40619
OSTI ID:
6049663
Journal Information:
Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:5; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English

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Related Subjects

663440* -- D-
T-
& He-induced Reactions & Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
CALCULATION METHODS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEUTERIUM TARGET
DEUTERON REACTIONS
DIFFERENTIAL CROSS SECTIONS
E2-TRANSITIONS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
GAMMA RADIATION
HELIUM 4
HELIUM ISOTOPES
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
POLARIZATION
RADIATIONS
RESONATING-GROUP METHOD
STABLE ISOTOPES
TARGETS
VARIATIONAL METHODS