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Observation of the isovector giant monopole resonance via the 28Si(10Be,10B*[1.74 MeV]) reaction at 100 AMeV

Scott, M, Zegers, RGT, Almus, R, Austin, SM, Bazin, D, Brown, BA, Campbell, C, Gade, A, Bowry, M, Gales, S , Garg, U, Harakeh, MN, Kwan, E, Langer, C, Loelius, C, Lipschutz, S, Litvinova, E, Lunderberg, E, Morse, C, Noji, S, Perdikakis, G, Redpath, T, Robin, C, Sakai, H, Sasamoto, Y, Sasano, M, Sullivan, C, Tostevin, JA, Uesaka, T and Weisshaar, D (2017) Observation of the isovector giant monopole resonance via the 28Si(10Be,10B*[1.74 MeV]) reaction at 100 AMeV Physical Review Letters, 118 (17), 172501.

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Abstract

The (10Be,10B [1.74 MeV]) charge-exchange reaction at 100 AMeV is presented as a new probe for isolating the isovector (ΔT = 1) non-spin-transfer (ΔS = 0) response of nuclei, with 28Si being the rst nucleus studied. By using a secondary 10Be beam produced by fast fragmentation of 18O nuclei at the NSCL Coupled Cyclotron Facility, applying the dispersion-matching technique with the S800 magnetic spectrometer to determine the excitation energy in 28Al, and performing high- resolution -ray tracking with the Gamma-Ray Energy Tracking Array (GRETINA) to identify the 1022-keV ray associated with the decay from the 1.74-MeV T = 1 isobaric analog state in 10B, a ΔS = 0 excitation-energy spectrum in 28Al was extracted. Monopole and dipole contributions were determined through a multipole-decomposition analysis, and the isovector giant dipole (IVGDR) and monopole (IVGMR) resonances were identi ed. The results show that this probe is a powerful tool for studying the elusive IVGMR, which is of interest for performing stringent tests of modern density functional theories at high excitation energies and for constraining the bulk properties of nuclei and nuclear matter. The extracted distributions were compared with theoretical calculations based on the normal-modes formalism and the proton-neutron relativistic time-blocking approximation. Calculated cross sections based on these strengths underestimate the data by about a factor of two, which likely indicates de ciencies in the reaction calculations based on the distorted wave Born approximation.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Scott, MUNSPECIFIEDUNSPECIFIED
Zegers, RGTUNSPECIFIEDUNSPECIFIED
Almus, RUNSPECIFIEDUNSPECIFIED
Austin, SMUNSPECIFIEDUNSPECIFIED
Bazin, DUNSPECIFIEDUNSPECIFIED
Brown, BAUNSPECIFIEDUNSPECIFIED
Campbell, CUNSPECIFIEDUNSPECIFIED
Gade, AUNSPECIFIEDUNSPECIFIED
Bowry, MUNSPECIFIEDUNSPECIFIED
Gales, SUNSPECIFIEDUNSPECIFIED
Garg, UUNSPECIFIEDUNSPECIFIED
Harakeh, MNUNSPECIFIEDUNSPECIFIED
Kwan, EUNSPECIFIEDUNSPECIFIED
Langer, CUNSPECIFIEDUNSPECIFIED
Loelius, CUNSPECIFIEDUNSPECIFIED
Lipschutz, SUNSPECIFIEDUNSPECIFIED
Litvinova, EUNSPECIFIEDUNSPECIFIED
Lunderberg, EUNSPECIFIEDUNSPECIFIED
Morse, CUNSPECIFIEDUNSPECIFIED
Noji, SUNSPECIFIEDUNSPECIFIED
Perdikakis, GUNSPECIFIEDUNSPECIFIED
Redpath, TUNSPECIFIEDUNSPECIFIED
Robin, CUNSPECIFIEDUNSPECIFIED
Sakai, HUNSPECIFIEDUNSPECIFIED
Sasamoto, YUNSPECIFIEDUNSPECIFIED
Sasano, MUNSPECIFIEDUNSPECIFIED
Sullivan, CUNSPECIFIEDUNSPECIFIED
Tostevin, JAJ.Tostevin@surrey.ac.ukUNSPECIFIED
Uesaka, TUNSPECIFIEDUNSPECIFIED
Weisshaar, DUNSPECIFIEDUNSPECIFIED
Date : 28 April 2017
Identification Number : 10.1103/PhysRevLett.118.172501
Copyright Disclaimer : Copyright 2017 American Physical Society
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 07 Apr 2017 10:58
Last Modified : 31 Oct 2017 19:18
URI: http://epubs.surrey.ac.uk/id/eprint/813983

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