Phys. Rev. Lett. 88, 142502 (2002) [4 pages]Experimental Evidence of Core Modification in the Near Drip-Line Nucleus 23OReceived 20 September 2001; published 22 March 2002 The longitudinal momentum (P‖) 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±34MeV/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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.142502
DOI:
10.1103/PhysRevLett.88.142502
PACS:
21.10.Dr, 27.30.+t
See AlsoReply: B. A. Brown, P. G. Hansen, and J. A. Tostevin, Comment on “Experimental Evidence of Core Modification in the Near Drip-Line Nucleus 23O”, Phys. Rev. Lett. 90, 159201 (2003). Reply: R. Kanungo, M. Chiba, N. Iwasa, S. Nishimura, A. Ozawa, C. Samanta, T. Suda, T. Suzuki, T. Yamaguchi, T. Zheng, and I. Tanihata, Kanungo et al. Reply, Phys. Rev. Lett. 90, 159202 (2003). |
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