@article{oai:sucra.repo.nii.ac.jp:00013233,
 author = {Rituparna, Kanungo and Chiba, Masami and Iwasa, Naohito and Nishimura, Shunji and Ozawa, Akira and Chhanda, Samanta and Suda, Toshimi and Suzuki, Takeshi and 山口, 貴之 and Tao, Zheng and Tanihata, Isao},
 issue = {14},
 journal = {PHYSICAL REVIEW LETTERS},
 month = {},
 note = {http://link.aps.org/abstract/PRL/v88/e142502 | http://link.aps.org/abstract/PRL/v88/e142502, The longitudinal momentum (PII) distributions of one- and two-neutron removal fragments ( 21,22O) of 23O from the reaction with a C target at 72 A MeV have been measured for the first time using a new direct time-of-flight method with nearly full acceptance for the breakup fragments. The unexpectedly narrow width of 21O ( 115±34 MeV/c in FWHM) is consistent with two neutrons occupying the 2s1/2 orbital in 23O. This indicates modification of core ( 22O) structure for neutron halolike sd shell nuclei near the drip line. This also suggests the lowering of the s orbital providing a justification for the N  =  16 magic number., Copyright notice(c)2002 American Physical Society. All rights reserved. 
Publisher's version: http://link.aps.org/abstract/PRL/v88/e142502, text, application/pdf},
 pages = {142502-1--142502-4},
 title = {Experimental Evidence of Core Modification in the Near Drip-Line Nucleus O-23},
 volume = {88},
 year = {2002},
 yomi = {ヤマグチ, タカユキ}
}