학술논문
Collectivity of neutron-rich Cr and Fe toward N=50
Document Type
article
Author
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.; Otsu H.; Péron C.; Peyaud A.; Pollacco E.C.; Roussé J.-Y.; Sakurai H.; Sasano M.; Shiga Y.; Takeuchi S.; Taniuchi R.; Uesaka T.; Wang H.; Yoneda K.; Browne F.; Chung L.X.; Dombradi Zs.; Franchoo S.; Giacoppo F.; Gottardo A.; Hadynska-Klek K.; Korkulu Z.; Koyama S.; Kubota Y.; Lee J.; Lettmann M.; Lozeva R.; Matsui K.; Miyazaki T.; Nishimura S.; Olivier L.; Ota S.; Patel Z.; Pietralla N.; Sahin E.; Shand C.; Söderström P.-A.; Stefan I.; Steppenbeck D.; Sumikama T.; Suzuki D.; Vajta Zs.; Wu J.; Xu Z.
Source
EPJ Web of Conferences, Vol 107, p 03007 (2016)
Subject
Language
English
ISSN
2100-014X
Abstract
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.