Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes
We search for potential isovector signatures in the neutron-rich oxygen and calcium isotopes within the framework of a relativistic mean-field theory with an exact treatment of pairing correlations. To probe the isovector sector we calibrate a few relativistic density functionals using the same isos...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2015-09-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315005304 |
| _version_ | 1811270965565325312 |
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| author | Wei-Chia Chen J. Piekarewicz |
| author_facet | Wei-Chia Chen J. Piekarewicz |
| author_sort | Wei-Chia Chen |
| collection | DOAJ |
| description | We search for potential isovector signatures in the neutron-rich oxygen and calcium isotopes within the framework of a relativistic mean-field theory with an exact treatment of pairing correlations. To probe the isovector sector we calibrate a few relativistic density functionals using the same isoscalar constraints but with one differing isovector assumption. It is found that under certain conditions, the isotopic chain in oxygen can be made to terminate at the experimentally observed 24O isotope and in the case of the calcium isotopes at 60Ca. To produce such behavior, the resulting symmetry energy must be soft, with predicted values for the symmetry energy and its slope at saturation density being J=(30.92±0.47) MeV and L=(51.0±1.5) MeV, respectively. As a consequence, the neutron-skin thickness of 208Pb is rather small: Rskin208=(0.161±0.011) fm. This same model—labeled “FSUGarnet”—predicts R1.4=(13.0±0.1) km for the radius of a “canonical” 1.4M⊙ neutron star, yet is also able to support a two-solar-mass neutron star. |
| first_indexed | 2024-04-12T22:12:49Z |
| format | Article |
| id | doaj.art-3aa307ffaba141eb9d1af4b6bb2b68d9 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-04-12T22:12:49Z |
| publishDate | 2015-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-3aa307ffaba141eb9d1af4b6bb2b68d92022-12-22T03:14:40ZengElsevierPhysics Letters B0370-26931873-24452015-09-01748C28428810.1016/j.physletb.2015.07.020Searching for isovector signatures in the neutron-rich oxygen and calcium isotopesWei-Chia ChenJ. PiekarewiczWe search for potential isovector signatures in the neutron-rich oxygen and calcium isotopes within the framework of a relativistic mean-field theory with an exact treatment of pairing correlations. To probe the isovector sector we calibrate a few relativistic density functionals using the same isoscalar constraints but with one differing isovector assumption. It is found that under certain conditions, the isotopic chain in oxygen can be made to terminate at the experimentally observed 24O isotope and in the case of the calcium isotopes at 60Ca. To produce such behavior, the resulting symmetry energy must be soft, with predicted values for the symmetry energy and its slope at saturation density being J=(30.92±0.47) MeV and L=(51.0±1.5) MeV, respectively. As a consequence, the neutron-skin thickness of 208Pb is rather small: Rskin208=(0.161±0.011) fm. This same model—labeled “FSUGarnet”—predicts R1.4=(13.0±0.1) km for the radius of a “canonical” 1.4M⊙ neutron star, yet is also able to support a two-solar-mass neutron star.http://www.sciencedirect.com/science/article/pii/S0370269315005304 |
| spellingShingle | Wei-Chia Chen J. Piekarewicz Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes Physics Letters B |
| title | Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes |
| title_full | Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes |
| title_fullStr | Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes |
| title_full_unstemmed | Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes |
| title_short | Searching for isovector signatures in the neutron-rich oxygen and calcium isotopes |
| title_sort | searching for isovector signatures in the neutron rich oxygen and calcium isotopes |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315005304 |
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