observation of isoscalar and isovector dipole excitations in neutron-rich 20o
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ID: 194777
2017
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Abstract
The isospin characters of low-energy dipole excitations in neutron-rich unstable nucleus 20O were investigated, for the first time in unstable nuclei. Two spectra obtained from a dominant isovector probe (O20+Au) and a dominant isoscalar probe (O20+α) were compared and analyzed by the distorted-wave Born approximation to extract independently the isovector and isoscalar dipole strengths. Two known 1− states with large isovector dipole strengths at energies of 5.36(5) MeV (11−) and 6.84(7) MeV (12−) were also excited by the isoscalar probe. These two states were found to have different isoscalar dipole strengths, 2.70(32)% (11−) and 0.67(12)% (12−), respectively, in exhaustion of the isoscalar dipole-energy-weighted sum rule. The difference in isoscalar strength indicated that they have different underlying structures.
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nakatsuka2017physicsobservation
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| Authors | ;N. Nakatsuka;H. Baba;T. Aumann;R. Avigo;S.R. Banerjee;A. Bracco;C. Caesar;F. Camera;S. Ceruti;S. Chen;V. Derya;P. Doornenbal;A. Giaz;A. Horvat;K. Ieki;T. Inakura;N. Imai;T. Kawabata;N. Kobayashi;Y. Kondo;S. Koyama;M. Kurata-Nishimura;S. Masuoka;M. Matsushita;S. Michimasa;B. Million;T. Motobayashi;T. Murakami;T. Nakamura;T. Ohnishi;H.J. Ong;S. Ota;H. Otsu;T. Ozaki;A. Saito;H. Sakurai;H. Scheit;F. Schindler;P. Schrock;Y. Shiga;M. Shikata;S. Shimoura;D. Steppenbeck;T. Sumikama;I. Syndikus;H. Takeda;S. Takeuchi;A. Tamii;R. Taniuchi;Y. Togano;J. Tscheuschner;J. Tsubota;H. Wang;O. Wieland;K. Wimmer;Y. Yamaguchi;K. Yoneda;J. Zenihiro |
| Journal | ACS chemical biology |
| Year | 2017 |
| DOI |
10.1016/j.physletb.2017.03.017
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| URL | |
| Keywords | Keywords not found |
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