Why is the three-nucleon force so odd? art. no. 044005

Citation
L. Canton et W. Schadow, Why is the three-nucleon force so odd? art. no. 044005, PHYS REV C, 6204(4), 2000, pp. 4005
Citations number
45
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C
ISSN journal
05562813 → ACNP
Volume
6204
Issue
4
Year of publication
2000
Database
ISI
SICI code
0556-2813(200010)6204:4<4005:WITTFS>2.0.ZU;2-8
Abstract
By considering a class of diagrams which has been overlooked also in the mo st recent literature on three-body forces, we extract a new contribution to the three-nucleon interaction which specifically acts on the tripler odd s tates of the two-nucleon subsystem. In the static approximation, this 3N-fo rce contribution is fixed by the underlying 2N interaction, so in principle there are no free parameters to adjust. The 2N amplitude however enters in the 3NF diagram in a form which cannot be directly accessed or constrained by NN phase-shift analysis. We conclude that this new 3N-force contributio n provides a mechanism which implies that the presence of the third nucleon modifies the p-wave (and possibly the f-wave) components of the 2N subsyst em in the triplet-isotriplet channels.