Coulomb polarizability of the deuteron and the [ital E]1 capture mechanism in the [sup 4]He([ital d],[gamma])[sup 6]Li reaction

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.286· OSTI ID:6942582

Jang, S ^[1]

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1. Institut des Sciences Nucleaires, 38026 Grenoble CEDEX (France)

The [sup 4]He ([ital d],[gamma])[sup 6]Li reaction, which proceeds through the overwhelming [ital E]2 transition, but with a small admixture of the [ital E]1 transition, is a possible mechanism for the [sup 6]Li nucleosynthesis in the Big Bang. The [ital E]1 radiation is, however, strongly suppressed in the radiative deuteron capture reaction in self-conjugate nuclei. Usually, the observed small, but not negligible, [ital E]1 radiation has been attributed to the spin-dependent electric dipole operator. In this study it is shown how the Coulomb polarization of the deuteron [sup 4]He([ital d],[gamma])[sup 6]Li reaction. Expressly we investigate the [ital E]1 capture process which proceeds with a small change of the deuteron internal structure in the entrance channel state. The structural change of the deuteron is engendered by the Coulomb field in the system of target and deuteron and such a deviant deuteron state is surveyed by calculating the expectation value of the relative coordinate between the proton and neutron in the deuteron. We then show how the electrically polarized deuteron state releases the usual [ital E]1 selection rule, and subsequently we calculate the relative intensity of the [ital E]1 versus [ital E]2 radiation in the [sup 4]He([ital d],[gamma])[sup 6]Li reaction.

• OSTI ID: 6942582
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663440* -- D-
T-
& He-induced Reactions & Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
CAPTURE
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COULOMB EXCITATION
DEUTERON REACTIONS
DEUTERONS
E1-TRANSITIONS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
GAMMA RADIATION
HELIUM 4 TARGET
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM 6
LITHIUM ISOTOPES
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEOSYNTHESIS
ODD-ODD NUCLEI
PHYSICAL PROPERTIES
POLARIZABILITY
RADIATIONS
STABLE ISOTOPES
SYNTHESIS
TARGETS