A model-independent technique was used to determine the γ-ray strength function (γSF) of Fe56 down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p,p′) reaction at 16 MeV. No difference was observed in the energy dependence of the γSF built on 2+ and 4+ final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. The polarization results show a small bias towards magnetic character in the region of the enhancement.

Examination of the low-energy enhancement of the gamma-ray strength function of Fe-56 / M.D. Jones, A.O. Macchiavelli, M. Wiedeking, L.A. Bernstein, H.L. Crawford, C.M. Campbell, R.M. Clark, M. Cromaz, P. Fallon, I.Y. Lee, M. Salathe, A. Wiens, A.D. Ayangeakaa, D.L. Bleuel, S. Bottoni, M.P. Carpenter, H.M. Davids, J. Elson, A. Görgen, M. Guttormsen, R.V.F. Janssens, J.E. Kinnison, L. Kirsch, A.C. Larsen, T. Lauritsen, W. Reviol, D.G. Sarantites, S. Siem, A.V. Voinov, S. Zhu. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 97:2(2018), pp. 024327.1-024327.6. [10.1103/PhysRevC.97.024327]

Examination of the low-energy enhancement of the gamma-ray strength function of Fe-56

S. Bottoni;
2018

Abstract

A model-independent technique was used to determine the γ-ray strength function (γSF) of Fe56 down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p,p′) reaction at 16 MeV. No difference was observed in the energy dependence of the γSF built on 2+ and 4+ final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. The polarization results show a small bias towards magnetic character in the region of the enhancement.
Stellar nucleosynthesis; R-process; nuclei; astrophysics; detector; array
Settore FIS/04 - Fisica Nucleare e Subnucleare
Article (author)
File in questo prodotto:
File Dimensione Formato  
PhysRevC.97.024327-accepted.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 468.38 kB
Formato Adobe PDF
468.38 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento 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/2434/565554
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 20
social impact