TY - JOUR
T1 - Extension of the N=40 Island of Inversion towards N=50
T2 - Spectroscopy of Cr 66, Fe 70,72
AU - SEASTAR collaboration
AU - Santamaria, C.
AU - Louchart, C.
AU - Obertelli, A.
AU - Werner, V.
AU - Doornenbal, P.
AU - Nowacki, F.
AU - Authelet, G.
AU - Baba, H.
AU - Calvet, D.
AU - Château, F.
AU - Corsi, A.
AU - Delbart, A.
AU - Gheller, J. M.
AU - Gillibert, A.
AU - Isobe, T.
AU - Lapoux, V.
AU - Matsushita, M.
AU - Momiyama, S.
AU - Motobayashi, T.
AU - Niikura, M.
AU - Otsu, H.
AU - Péron, C.
AU - Peyaud, A.
AU - Pollacco, E. C.
AU - Roussé, J. Y.
AU - Sakurai, H.
AU - Sasano, M.
AU - Shiga, Y.
AU - Takeuchi, S.
AU - Taniuchi, R.
AU - Uesaka, T.
AU - Wang, H.
AU - Yoneda, K.
AU - Browne, F.
AU - Chung, L. X.
AU - Dombradi, Zs
AU - Franchoo, S.
AU - Giacoppo, F.
AU - Gottardo, A.
AU - Hadynska-Klek, K.
AU - Korkulu, Z.
AU - Koyama, S.
AU - Kubota, Y.
AU - Lee, J.
AU - Lettmann, M.
AU - Lozeva, R.
AU - Matsui, K.
AU - Miyazaki, T.
AU - Nishimura, S.
AU - Olivier, L.
PY - 2015/11/3
Y1 - 2015/11/3
N2 - We report on the measurement of the first 2+ and 4+ states of Cr66 and Fe70,72 via in-beam γ-ray spectroscopy. The nuclei of interest were produced by (p,2p) reactions at incident energies of 260 MeV/nucleon. The experiment was performed at the Radioactive Isotope Beam Factory, RIKEN, using the DALI 2γ-ray detector array and the novel MINOS device, a thick liquid hydrogen target combined with a vertex tracker. A low-energy plateau of 21+ and 41+ energies as a function of the neutron number was observed for N≥38 and N≥40 for even-even Cr and Fe isotopes, respectively. State-of-the-art shell model calculations with a modified Lenzi-Nowacki-Poves-Sieja (LNPS) interaction in the pfg9/2d5/2 valence space reproduce the observations. Interpretation within the shell model shows an extension of the island of inversion at N=40 for more neutron-rich isotopes towards N=50.
AB - We report on the measurement of the first 2+ and 4+ states of Cr66 and Fe70,72 via in-beam γ-ray spectroscopy. The nuclei of interest were produced by (p,2p) reactions at incident energies of 260 MeV/nucleon. The experiment was performed at the Radioactive Isotope Beam Factory, RIKEN, using the DALI 2γ-ray detector array and the novel MINOS device, a thick liquid hydrogen target combined with a vertex tracker. A low-energy plateau of 21+ and 41+ energies as a function of the neutron number was observed for N≥38 and N≥40 for even-even Cr and Fe isotopes, respectively. State-of-the-art shell model calculations with a modified Lenzi-Nowacki-Poves-Sieja (LNPS) interaction in the pfg9/2d5/2 valence space reproduce the observations. Interpretation within the shell model shows an extension of the island of inversion at N=40 for more neutron-rich isotopes towards N=50.
UR - http://www.scopus.com/inward/record.url?scp=84946866400&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.115.192501
DO - 10.1103/PhysRevLett.115.192501
M3 - Article
AN - SCOPUS:84946866400
SN - 0031-9007
VL - 115
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 192501
ER -