☆ 4.8 Article

Hindered Proton Collectivity in 2816S12: Possible Magic Number at Z=16

PHYSICAL REVIEW LETTERS (2012)

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PHYSICAL REVIEW LETTERS
Volume 108, Issue 21, Pages -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.222501

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Physics, Multidisciplinary

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  1. RIKEN
  2. Helmholtz Alliance EMMI
  3. Research Center for Measurement in Advanced Science at Rikkyo University
  4. National Research Foundation of Korea [R32-2012-000-10155-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  5. Grants-in-Aid for Scientific Research [24105004, 22340053, 24740154, 22340072, 10J09675] Funding Source: KAKEN

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The reduced transition probability B(E2; 0(gs)(+) -> 2(1)(+)) for S-28 was obtained experimentally using Coulomb excitation at 53 MeV/nucleon. The resultant B(E2) value 181(31) e(2)fm(4) is smaller than the expectation based on empirical B(E2) systematics. The double ratio vertical bar M-n/M-p vertical bar/(N/Z) of the 0(gs)(+) -> 2(1)(+) transition in S-28 was determined to be 1.9(2) by evaluating the M-n value from the known B(E2) value of the mirror nucleus Mg-28, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z = 16 in the vertical bar T-z vertical bar = 2 nucleus S-28.

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