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Tytuł:
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Collectivity of neutron-rich Cr and Fe toward N=50.
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Autorzy:
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Werner, V.
Santamaria, C.
Louchart, C.
Obertelli, A.
Doornenbal, P.
Nowacki, F.
Authelet, G.
Baba, H.
Calvet, D.
Château, F.
Corsi, A.
Delbart, A.
Gheller, J. -M.
Gillibert, A.
Isobe, T.
Lapoux, V.
Matsushita, M.
Momiyama, S.
Motobayashi, T.
Niikura, M.
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Temat:
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PROTON spectra
LIQUID hydrogen
PROTON measurements
NUCLEAR reactions
NUCLEAR physics
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Źródło:
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EPJ Web of Conferences; 2016, Vol. 107, p03007-p.1-03007-p.6, 6p
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Within the SEASTAR project at RIKEN-RIBF, 66Cr and 70,72Fe have been produced via protonknockout reactions, and their first excited 2+ and 4+ states have been discovered. The combination of the liquid-hydrogen target and TPC system MINOS has been used in combination with the DALI2 detector array for the first time. A 345 MeV/u 238U beam with a mean intensity of about 12 pnA impinged on a Be target. Fission fragments were separated and identified using the BigRIPS spectrograph, and reaction products were analyzed using the ZeroDegree spectrograph. A plateau of excitation energies, with a small change in the systematic trends past N = 44, reveals an extension of the N = 40 region of collectivity toward N = 50. Hence, the isotopes of interest are located within the N = 40 island of inversion. An interpretation of the observed trends is offered through large scale shell model calculations. [ABSTRACT FROM AUTHOR]
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