Experimental Evidence of Core Modification in the Near Drip-Line Nucleus O-23

Kanungo, Rituparna; Chiba, Masami; Iwasa, Naohito; Nishimura, Shunji; Ozawa, Akira; Samanta, Chhanda; Suda, Toshimi; Suzuki, Takeshi; Yamaguchi, Takayuki; Zheng, Tao

doi:10.1103/PhysRevLett.88.142502

Experimental Evidence of Core Modification in the Near Drip-Line Nucleus O-23

Apr 8, 2002

4 pages

Published in:

Phys.Rev.Lett. 88 (2002) 142502

DOI:

10.1103/PhysRevLett.88.142502

View in:

Nuclear Science References

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Abstract: (APS)

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.