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001-es BibID:	BIBFORM072744
035-os BibID:	(WoS)000424089400007 (Scopus)85042130747
Első szerző:	Betan, R. Id (fizikus)
Cím:	Shadow poles in coupled-channel problems calculated with the Berggren basis / Id Betan, R. M., Kruppa, A. T., Vertse, T.
Dátum:	2018
ISSN:	2469-9985 2469-9993
Megjegyzések:	In coupled-channel models the poles of the scattering S-matrix are located on different Riemannsheets. Physical observables are affected mainly by poles closest to the physical region but sometimes shadowpoles have considerable effect, too. The purpose of this paper is to show that in coupled-channel problems all poles of the S-matrix canbe located by an expansion in terms of a properly constructed complex-energy basis. The Berggren basis is used for expanding the coupled-channel solutions. The locations of the poles of the S-matrix for the Cox potential, constructed for coupled channelproblems, were numerically calculated and compared with the exact ones. In a nuclear physics application theJ = 3/2+ resonant poles of 5He were calculated in a phenomenological two channel model. The properties ofboth the normal and shadow resonances agree with previous findings. We have shown that, with an appropriately chosen Berggren basis, all poles of the S-matrixincluding the shadow poles can be determined. We have found that the shadow pole of 5He migrates betweenRiemann sheets if the coupling strength is varied.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Physical Review C. - 97 : 2 (2018), p. 1-10. -
További szerzők:	Kruppa András Tibor (1955-) (fizikus) Vertse Tamás (1942-) (fizikus)
Pályázati támogatás:	OTKA-112962 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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