Speaker
Prof.
Toshiyuki Kubo
(FRIB/NSCL, Michigan State University)
Description
Particle-bound isotopes along the neutron dripline have been searched for fluorine (Z = 9) and neon (Z = 10) isotopes at the RIKEN RI Beam Factory (RIBF) by using projectile fragmentation of an intense 48Ca beam at 345 MeV/nucleon and the large-acceptance fragment separator BigRIPS. Observation of null counts for 32F, 33F and 35Ne, 36Ne isotopes and comparison with their expected production yields have showed that existence of particle-stable states of these isotopes is excluded with high confidence levels. It is thus found that the most neutron-rich isotopes 31F and 34Ne previously observed are the heaviest of these isotopes. The confirmed neutron driplines have thus been extended for the first time since nearly 20 years ago, in which the 24O isotope was confirmed to be on the dripline of oxygen (Z = 8) isotopes. The present determination of neutron driplines will provide keys to understand the nuclear stability at extremely neutron-rich conditions.
Primary author
Prof.
Toshiyuki Kubo
(FRIB/NSCL, Michigan State University)
Co-authors
Prof.
Brad M. Sherrill
(NSCL, Michigan State University)
Mr
Daichi Murai
(RIKEN Nishina Center)
Prof.
David Morrissey
(NSCL, Michigan State University)
Dr
DeukSoon Ahn
(RIKEN Nishina Center)
Prof.
Hans Geissel
(GSI)
Dr
Hideaki Otsu
(RIKEN Nishina Center)
Dr
Hiromi Sato
(RIKEN Nishina Center)
Dr
Hiroshi Suzuki
(RIKEN Nishina Center)
Dr
Hiroyuki Takeda
(RIKEN Nishina Center)
Dr
Kensuke Kusaka
(RIKEN Nishina Center)
Dr
Koichi Yoshida
(RIKEN Nishina Center)
Mr
Masao Otake
(RIKEN Nishina Center)
Mr
Naohito Inabe
(RIKEN Nishina Center)
Prof.
Naohito Iwasa
(Tohoku University)
Dr
Naoki Fukuda
(RIKEN Nishina Center)
Dr
Oleg B. Tarasov
(NSCL, Michigan State University)
Prof.
Takashi Nakamura
(Tokyo Institute of Technology)
Dr
Yohei Shimizu
(RIKEN Nishina Center)
Dr
Yoshiyuki Yanagisawa
(RIKEN Nishina Center)