Isospin and Spin-isospin Modes in Charge-exchange Reactions

M. N. Harakeh; H. Akimune; A. M. van den Berg; S. Brandenburg; M. Fujiwara; H. Laurent; A. Willis; R. G. T. Zegers

doi:10.1063/1.1301794

Isospin and Spin-isospin Modes in Charge-exchange Reactions

M. N. Harakeh
, H. Akimune
, A. M. van den Berg
, S. Brandenburg
, M. Fujiwara
, H. Laurent
, A. Willis
, R. G. T. Zegers

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The microscopic structure of the Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) in 208Bi has been investigated in the 208Pb(3He,tp)207Pb reaction at E(3He)=450 MeV and very forward scattering angles. The partial and total branching ratios and the escape widths for GTR and SDR decay to the residual neutron-hole states in 207Pb were deduced. These are found to be in good agreement with recent theoretical estimates. The (3He,tp) reaction on Pb at E(3He)=177 MeV was also studied in order to locate isovector monopole strength corresponding to 2ℏω transitions. Monopole strength at excitation energies above 25 MeV was discovered and compared to calculated strength due to the isovector giant monopole resonance and the spin-flip isovector monopole resonance. Calculations in a normal-mode framework show that all isovector monopole strength can be accounted for if the branching ratio for decay by proton emission is 20%.

Original language	English
Pages (from-to)	275-282
Number of pages	8
Journal	AIP Conference Proceedings
Volume	495
Issue number	1
DOIs	https://doi.org/10.1063/1.1301794
Publication status	Published - 1999

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Isospin and Spin-isospin Modes in Charge-exchange Reactions
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@article{629e6945020c4694a8c59cd6779200c4,

title = "Isospin and Spin-isospin Modes in Charge-exchange Reactions",

abstract = "The microscopic structure of the Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) in 208Bi has been investigated in the 208Pb(3He,tp)207Pb reaction at E(3He)=450 MeV and very forward scattering angles. The partial and total branching ratios and the escape widths for GTR and SDR decay to the residual neutron-hole states in 207Pb were deduced. These are found to be in good agreement with recent theoretical estimates. The (3He,tp) reaction on Pb at E(3He)=177 MeV was also studied in order to locate isovector monopole strength corresponding to 2ℏω transitions. Monopole strength at excitation energies above 25 MeV was discovered and compared to calculated strength due to the isovector giant monopole resonance and the spin-flip isovector monopole resonance. Calculations in a normal-mode framework show that all isovector monopole strength can be accounted for if the branching ratio for decay by proton emission is 20\%.",

author = "Harakeh, \{M. N.\} and H. Akimune and \{van den Berg\}, \{A. M.\} and S. Brandenburg and M. Fujiwara and H. Laurent and A. Willis and Zegers, \{R. G. T.\}",

year = "1999",

doi = "10.1063/1.1301794",

language = "English",

volume = "495",

pages = "275--282",

journal = "AIP Conference Proceedings",

issn = "0094-243x",

publisher = "AIP PRESS",

number = "1",

}

TY - JOUR

T1 - Isospin and Spin-isospin Modes in Charge-exchange Reactions

AU - Harakeh, M. N.

AU - Akimune, H.

AU - van den Berg, A. M.

AU - Brandenburg, S.

AU - Fujiwara, M.

AU - Laurent, H.

AU - Willis, A.

AU - Zegers, R. G. T.

PY - 1999

Y1 - 1999

N2 - The microscopic structure of the Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) in 208Bi has been investigated in the 208Pb(3He,tp)207Pb reaction at E(3He)=450 MeV and very forward scattering angles. The partial and total branching ratios and the escape widths for GTR and SDR decay to the residual neutron-hole states in 207Pb were deduced. These are found to be in good agreement with recent theoretical estimates. The (3He,tp) reaction on Pb at E(3He)=177 MeV was also studied in order to locate isovector monopole strength corresponding to 2ℏω transitions. Monopole strength at excitation energies above 25 MeV was discovered and compared to calculated strength due to the isovector giant monopole resonance and the spin-flip isovector monopole resonance. Calculations in a normal-mode framework show that all isovector monopole strength can be accounted for if the branching ratio for decay by proton emission is 20%.

AB - The microscopic structure of the Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) in 208Bi has been investigated in the 208Pb(3He,tp)207Pb reaction at E(3He)=450 MeV and very forward scattering angles. The partial and total branching ratios and the escape widths for GTR and SDR decay to the residual neutron-hole states in 207Pb were deduced. These are found to be in good agreement with recent theoretical estimates. The (3He,tp) reaction on Pb at E(3He)=177 MeV was also studied in order to locate isovector monopole strength corresponding to 2ℏω transitions. Monopole strength at excitation energies above 25 MeV was discovered and compared to calculated strength due to the isovector giant monopole resonance and the spin-flip isovector monopole resonance. Calculations in a normal-mode framework show that all isovector monopole strength can be accounted for if the branching ratio for decay by proton emission is 20%.

U2 - 10.1063/1.1301794

DO - 10.1063/1.1301794

M3 - Article

SN - 0094-243x

VL - 495

SP - 275

EP - 282

JO - AIP Conference Proceedings

JF - AIP Conference Proceedings

IS - 1

ER -

Isospin and Spin-isospin Modes in Charge-exchange Reactions

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