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A recent Letter by Kanungo et al. [1] presents measurements of inclusive oneand two-neutron removal reactions of 23O at a beam energy of 72 MeV=nucleon. The longitudinal momentum (pk) distributions of the residues were analyzed in a model which couples a nucleon to inert core states. The conclusion was that the ‘‘first clear evidence’’ was obtained of a structure change in the 22O core. In this Comment we point out that a well-developed framework exists [2,3] for analysis of such data. For the neutron-rich oxygen isotopes this approach is in good agreement with the measurements and moreover with the normal expectations of the p-sd shell structure. Difficulties in the paper by Kanungo et al. arise on two fronts: (i) one cannot describe one-neutron removal reactions without recourse to the many-body nature of 23O, and (ii) partial cross sections to individual final states, obtained for other nuclei from ray coincidences, were not measured. Still, inclusive measurements can provide a stimulating first survey [4]. Energy levels and spectroscopic factors for states in the daughter nucleus 22O up to the neutron threshold of 6.85(6) MeV obtained with the universal sd (USD) interaction [5,6] in the sd model space are given in Table I. With USD 23O has a 1=2 ground state with a first excited 5=2 state at 2.7 MeV [6], close to the neutron threshold of 2.74(12) MeV. Since it is known in this mass region that the 0d5=2, 1s1=2, and 0d3=2 shells are regularly spaced with pronounced submagic numbers at 14 and 16 [7], a nearquantitative understanding of the results can be reached by elementary means. We may approximate 23O as the configuration 0d 6 5=2 1s1=2. Taking the ‘ 0, two single-particle cross sections ‘ from Table I as 64 and 23 mb, we estimate 1n 0 6 2 202 mb, which agrees with the datum [1] of 233(37) mb. This configuration also suggests that the 0d5=2 hole and 1s1=2 particle will couple to 2 and 3 final states with spectroscopic factors of 2.5 and 3.5. The cross section for removing one d-shell neutron from 22O has been measured [4] at 51 MeV=nucleon to be 122 mb, likewise in good agreement with the elementary estimate 6 2 125 mb. The

physical review letters

Comment on “Experimental Evidence of Core Modification in the Near Drip-Line Nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>23</mml:mn></mml:mmultiscripts></mml:math>”

Comment on “Experimental Evidence of Core Modification in the Near Drip-Line NucleusO23”