The isoscalar monopole response has been measured in the unstable nucleus Ni-68 using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 +/- 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 +/- 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L = 0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei.

Measurement of the Isoscalar Monopole Response in the Neutron-Rich Nucleus Ni-68 / M. Vandebrouck, J. Gibelin, E. Khan, N.L. Achouri, H. Baba, D. Beaumel, Y. Blumenfeld, M. Caamano, L. Caceres, G. Colo, F. Delaunay, B. Fernandez Dominguez, U. Garg, G.F. Grinyer, M.N. Harakeh, N. Kalantar Nayestanaki, N. Keeley, W. Mittig, J. Pancin, R. Raabe, T. Roger, P. Roussel Chomaz, H. Savajols, O. Sorlin, C. Stodel, D. Suzuki, J.C. Thomas. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:3(2014), pp. 032504.1-032504.5. [10.1103/PhysRevLett.113.032504]

Measurement of the Isoscalar Monopole Response in the Neutron-Rich Nucleus Ni-68

G. Colo;
2014

Abstract

The isoscalar monopole response has been measured in the unstable nucleus Ni-68 using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 +/- 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 +/- 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L = 0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei.
Settore FIS/04 - Fisica Nucleare e Subnucleare
2014
Article (author)
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.113.032504.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 332.71 kB
Formato Adobe PDF
332.71 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/362373
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 41
  • ???jsp.display-item.citation.isi??? 40
social impact