Investigation of the isoscalar response of 24Mg to 6Li scattering

Zamora, J. C.; Sullivan, C.; Zegers, R. T.; Aoi, N.; Batail, L.; Bazin, D.; Carpenter, M.; Carroll, J. J.; Fang, Y. D.; Fujita, H.; Garg, U.; Gey, G.; Guess, C. J.; Harakeh, M. N.; Hoang, T. H.; Hudson, E.; Ichige, N.; Ideguchi, E.; Inoue, A.; Isaak, J.; Iwamoto, C.; Kacir, C.; Kobayashi, N.; Koike, T.; Kumar Raju, M.; Lipschutz, S.; Liu, M.; von Neumann-Cosel, P.; Noji, S.; Ong, H. J.; Péru, S.; Pereira, J.; Schmitt, J.; Tamii, A.; Titus, R.; Werner, V.; Yamamoto, Y.; Zhou, X.; Zhu, S.

doi:10.1103/physrevc.104.014607

Title: Investigation of the isoscalar response of ²⁴Mg to ⁶Li scattering

Journal Article · Wed Jul 07 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.104.014607· OSTI ID:1819262

^[1]; Sullivan, C. ^[2]; Zegers, R. T. ^[2]; Aoi, N. ^[3]; Batail, L. ^[4]; Bazin, D. ^[2]; Carpenter, M. ^[5]; Carroll, J. J. ^[6]; Fang, Y. D. ^[3]; Fujita, H. ^[3]; Garg, U. ^[7]; Gey, G. ^[3]; Guess, C. J. ^[8]; Harakeh, M. N. ^[9]; Hoang, T. H. ^[3]; Hudson, E. ^[8]; Ichige, N. ^[10]; Ideguchi, E. ^[3]; Inoue, A. ^[3]; Isaak, J. ^[11] more »

Univ. of Sao Paulo (Brazil)
Michigan State Univ., East Lansing, MI (United States)
Osaka Univ. (Japan)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Argonne National Lab. (ANL), Argonne, IL (United States)
US Dept. of Homeland Security (DHS), Aberdeen Proving Ground, MD (United States). DEVCOM Chemical Biological Center
Univ. of Notre Dame, IN (United States)
Swarthmore College, Swarthmore, PA (United States)
Osaka Univ. (Japan); University of Groningen (The Netherlands)
Tohoku Univ., Sendai (Japan)
Osaka Univ. (Japan); Darmstadt Univ. of Technology (Germany)
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
Chinese Academy of Sciences (CAS), Beijing (China)
Darmstadt Univ. of Technology (Germany)
Chinese Academy of Sciences (CAS), Lanzhou (China)

²⁴Mg is a strongly deformed nucleus in the ground state. Deformation effects can be observed in the structure of the isoscalar giant monopole and quadrupole resonances. ²⁴Mg is also a nucleus that is well known to present different types of cluster-oscillation modes. Both giant resonances and cluster states are strongly populated by isoscalar transitions. To extract the E0, E1, and E2 transition strengths via ⁶Li scattering. The ⁶Li probe is a powerful tool for investigating the isoscalar nuclear response with a very favorable ratio of resonance-to-continuum background. Double-differential cross sections of ⁶Li inelastic scattering, at the beam energy of 100 MeV/u, were measured in the excitation-energy range 10 – 40 MeV and scattering angles 0 - 3°. A multipole-decomposition analysis was performed for extracting the isoscalar E0 , E1, and E2 strength distributions. Results: The extracted multipole strengths were compared with predictions from consistent quasiparticle random phase approximation calculations. The theoretical predictions are in fair agreement with the experimental data. The E0 strength was also compared with results from antisymmetrized molecular dynamics calculations found in the literature. A few peaks in the experimental data might be associated with clustering in ²⁴Mg. Ground-state deformation effects were observed in the isoscalar giant monopole resonance (ISGMR) and isoscalar giant quadrupole resonance (ISGQR) distributions. The ISGMR strength is split in two peaks around 19 and 28 MeV. The ISGQR exhibits a pronounced peak at 20 MeV with a broadening at the low-energy region, similar to predictions from microscopic calculations. Signatures of excitation of cluster states were observed in the E0 response. Further studies including particle-decay measurements will be required to confirm the nature of the observed peaks.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Sao Paulo Research Foundation (FAPESP); German Research Foundation (DFG); National Science Foundation (NSF); German Federal Ministry of Education and Research (BMBF)

Grant/Contract Number:: AC02-06CH11357; PHY-1430152; PHY-1565546; PHY-1713857; PHY-2011890; AC02-06CH113567; 05P19RDFN1; 279384907

OSTI ID:: 1819262

Journal Information:: Physical Review C, Vol. 104, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigation of the isoscalar response of ²⁴Mg to ⁶Li scattering