Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27

Loelius, C.; Kobayashi, N.; Iwasaki, H.; Bazin, D.; Belarge, J.; Bender, P. C.; Brown, B. A.; Elder, R.; Elman, B.; Gade, A.; Grinder, M.; Heil, S.; Hufnagel, A.; Longfellow, B.; Lunderberg, E.; Mathy, M.; Otsuka, T.; Petri, M.; Syndikus, I.; Tsunoda, N.; Weisshaar, D.; Whitmore, K.

doi:10.1103/PhysRevLett.121.262501

Title: Enhanced Electric Dipole Strength for the Weakly Bound States in ${}^{27}{Ne}$

Journal Article · Fri Dec 28 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.262501· OSTI ID:1490972

Loelius, C. ^[1]; Kobayashi, N. ^[2]; Iwasaki, H. ^[1]; Bazin, D. ^[1]; Belarge, J. ^[1]; Bender, P. C. ^[3]; Brown, B. A. ^[1]; Elder, R. ^[1]; Elman, B. ^[1]; Gade, A. ^[1]; Grinder, M. ^[1]; Heil, S. ^[4]; Hufnagel, A. ^[4]; Longfellow, B. ^[1]; Lunderberg, E. ^[1]; Mathy, M. ^[4]; Otsuka, T. ^[5]; Petri, M. ^[6]; Syndikus, I. ^[4]; Tsunoda, N. ^[7] more »

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.

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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

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Cited by: 6 works

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Enhanced $E 1$ transition between weakly-bound excited states in the nucleus ${}^{27}{Ne}$ Hamamoto, Ikuko Physical Review C, Vol. 100, Issue 1 https://doi.org/10.1103/physrevc.100.014324	journal	July 2019

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Title: Enhanced Electric Dipole Strength for the Weakly Bound States in ${}^{27}{Ne}$