Enhanced Electric Dipole Strength for the Weakly Bound States in
- Michigan State Univ., East Lansing, MI (United States)
- Michigan State Univ., East Lansing, MI (United States); Osaka Univ., Osaka (Japan)
- Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
- Technische Univ. Darmstadt, Darmstadt (Germany)
- Michigan State Univ., East Lansing, MI (United States); Univ. of Tokyo, Tokyo (Japan); RIKEN Nishina Center, Saitama (Japan)
- Technische Univ. Darmstadt, Darmstadt (Germany); Univ. of York, York (United Kingdom)
- Univ. of Tokyo, Tokyo (Japan)
In this paper, an enhanced low-energy electric dipole (E1) strength is identified for the weakly bound excited states of the neutron-rich isotope 27Ne. The Doppler-shift lifetime measurements employing a combination of the γ-ray tracking array GRETINA, the plunger device, and the S800 spectrograph determine the lower limit of 0.030 e2 fm2 or 0.052 W.u. for the 1/2+ → 3/2– E1 transition in 27Ne, representing one of the strongest E1 strengths observed among the bound discrete states in this mass region. This value is at least 30 times larger than that measured for the 3/2– decay to the 3/2+gs ground state. A comparison of the present results to large-scale shell-model calculations points to an important role of core excitations and deformation in the observed E1 enhancement, suggesting a novel example of the electric dipole modes manifested in weakly bound deformed systems.
- Research Organization:
- Univ. of California, Berkeley, CA (United States); Michigan State Univ., East Lansing, MI (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- NA0003180; NA0000979; SC0014537
- OSTI ID:
- 1490972
- Alternate ID(s):
- OSTI ID: 1489082; OSTI ID: 1524942
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 26; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Enhanced transition between weakly-bound excited states in the nucleus
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journal | July 2019 |
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