@article{47e886e75ade4e9b9c1375ad91e46d83,
title = "RPA calculations of isovector spin-flip excitations",
abstract = "The Gamow-Teller strength, M1 strength and the strength of the σt+ operator are evaluated in the TDA and RPA for 60Ni, 90Zr and 208Pb. The one particle-one hole space is complete and includes the continuum, enabling us to evaluate the escape width of the resonances. The influence of the RPA correlations on the strength in the three modes is discussed in detail.",
author = "N. Auerbach and L. Zamick and A. Klein",
note = "Funding Information: The recent (p, n) measurements of the Gamow-Teller strength \textbackslash{}[1\textbackslash{}]a nd the (p, p') \textbackslash{}[2,3\textbackslash{}] or (e, e') measurements \textbackslash{}[4\textbackslash{}] of the M1 strength seem to indicate that a substantial amount of the isovector spin-flip strength is missing from the low-energy region. More precisely, the total strength contained in the main peaks excited in these processes is smaller than the strength expected from the simple shell-model description of Gamow-Teller or M1 states (or resonances). It was suggested \textbackslash{}[5\textbackslash{}]t hat the nucleon particle-hole (p-h) states mix with the A-particle-nucleon hole configurations (A--h) and as a result much of the strength is removed to higher energies at around 300 MeV excitation energy. In the present work however we will not deal with this aspect of coupling to the A but rather we will concentrate on a complete RPA (and for comparison also TDA) simultaneous description of the three types of modes that can be reached by the \textasciitilde{}i °(i)t(i), \textasciitilde{}i °ff)tO') and the Ni °(i)tO') operators. There are marked differences in the three cases and we will discuss these in detail. Our main aim is to study the influence of the RPA correlations and of the high 1 p- lh configurations on the distribution of strength Supported by the National Science Foundation and the U.S.-Israel Binational Science Foundation.",
year = "1982",
month = dec,
day = "9",
doi = "10.1016/0370-2693(82)90179-4",
language = "English (US)",
volume = "118",
pages = "256--260",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier B.V.",
number = "4-6",
}