Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session MM: Nuclear Structure A=30-60
2:00 PM–4:45 PM,
Saturday, October 27, 2018
Hilton
Room: Queen's 6
Chair: Adam Fritsch, Gonzaga University
Abstract ID: BAPS.2018.HAW.MM.6
Abstract: MM.00006 : Direct mass measurements of very neutron-rich calcium isotopes beyond N=34*
3:15 PM–3:30 PM
Presenter:
Shin'ichiro Michimasa
(Center for Nuclear Study, the University of Tokyo)
Authors:
Shin'ichiro Michimasa
(Center for Nuclear Study, the University of Tokyo)
Motoki Kobayashi
(Center for Nuclear Study, the University of Tokyo)
Yu Kiyokawa
(Center for Nuclear Study, the University of Tokyo)
Shinsuke Ota
(Center for Nuclear Study, the University of Tokyo)
D. S. Ahn
(RIKEN Nishina Center)
H. Baba
(RIKEN Nishina Center)
G. P. A. Berg
(University of Notre Dame)
M. Dozono
(Center for Nuclear Study, the University of Tokyo)
N. Fukuda
(RIKEN Nishina Center)
E. Ideguchi
(RCNP, Osaka Univ.)
S. Kawase
(Kyushu University)
T. Kubo
(Michigan State Univ)
Y. Kubota
(RIKEN Nishina Center)
C. S. Lee
(Center for Nuclear Study, the University of Tokyo)
D. Nishimura
(Tokyo City University)
H. Sakai
(RIKEN Nishina Center)
Y. Shimizu
(RIKEN Nishina Center)
A. Stolz
(Michigan State Univ)
H. Suzuki
(RIKEN Nishina Center)
M. Takaki
(Center for Nuclear Study, the University of Tokyo)
H. Takeda
(RIKEN Nishina Center)
S. Takeuchi
(Tokyo Institute of Technology)
T. Uesaka
(RIKEN Nishina Center)
R. Yokoyama
(University of Tennessee)
S. Shimoura
(Center for Nuclear Study, the University of Tokyo)
Nuclear mass is one of the fundamental quantities expressing its nuclear structure property, and systematic investigation of nuclear masses can illuminate unexpected phenomena such as emergency of new magic numbers and disappearance of conventional magic numbers. In order to obtain the conclusive evidence of the emergency of theoretically-proposed magic number N=34, we have performed an experiment to measure the atomic masses of very neutron-rich calcium isotopes beyond N=34 and have determined the atomic masses of 55-57Ca isotopes successfully for the first time. The experiment was done using the BigRIPS-SHARAQ system at RIKEN RIBF. The masses were determined by TOF-Bρ method in use of CVD diamond timing detectors, LP-MWDC tracking detectors and a PPAC detector. The determined masses made clear a magic nature of neutrons in 54Ca and the emergence of the new magic number 34 became evident in neutron-rich calcium isotopes. In this contribution, we will present details of the experiment and discuss the obtained results.
*This work is financially supported in part by JSPS KAKENHI Grant No. JP14J03376.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.MM.6
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