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Anomalously hindered E2 strength B(E2;2+(1)-->0+) in 16C.

N Imai1, H J Ong, N Aoi

  • 1RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan. imai@rarfaxp.riken.go.jp

Physical Review Letters
|March 5, 2004
PubMed
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This summary is machine-generated.

Researchers measured the lifetime of radioactive 16C nuclei to study electric quadrupole transitions. The transition strength was found to be anomalously small, differing from predictions.

Area of Science:

  • Nuclear Physics
  • Atomic Physics

Background:

  • Electric quadrupole transitions are fundamental to understanding nuclear structure.
  • The 16C nucleus presents a unique case for studying nuclear properties due to its specific composition.

Purpose of the Study:

  • To precisely measure the lifetime of the first excited 2(+) state in the 16C nucleus.
  • To determine the electric quadrupole (E2) transition strength from the 2(+) state to the ground 0(+) state in 16C.
  • To compare the experimental findings with theoretical predictions and investigate discrepancies.

Main Methods:

  • Utilizing a recoil shadow method for lifetime measurement.
  • Employing inelastic scattering of radioactive 16C nuclei.
  • Analyzing the decay characteristics of excited nuclear states.

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Main Results:

  • The mean lifetime of the 16C first 2(+) state was measured to be 77±14(stat)±19(syst) picoseconds.
  • The derived B(E2;2+→0+) transition strength is 0.63e(2) fm(4), equivalent to 0.26 Weisskopf units.
  • This experimentally determined transition strength is significantly smaller than empirically predicted values.

Conclusions:

  • The electric quadrupole transition in 16C is anomalously weak.
  • The findings challenge existing theoretical models for predicting transition strengths in light nuclei.
  • Further theoretical and experimental investigations are warranted to explain the observed deviation.