Formation of α clusters in dilute neutron-rich matter
Authors/Creators
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Tanaka, Junki1
-
Yang, Zaihong2
- Typel, Stefan3
- Adachi, Satoshi4
- Bai, Shiwei5
- van Beek, Patrick6
- Fujikawa, Yuki7
- Han, Jiaxing5
- Heil, Sebastian6
- Huang, Siwei5
- Inoue, Azusa4
- Jiang, Ying5
- Knösel, Marco6
- Kobayashi, Nobuyuki4
- Kubota, Yuki8
- Liu, Wei5
- Lou, Jianling5
- Maeda, Yukie9
- Matsuda, Yohei10
- Miki, Kenjiro10
- Nakamura, Shoken4
- Ogata, Kazuyuki4
- Panin, Valerii8
- Scheit, Heiko6
- Schindler, Fabia6
- Schrock, Philipp11
- Symochko, Dmytro6
- Tamii, Atsushi4
- Uesaka, Tomohiro8
- Wagner, Vadim6
- Yoshida, Kazuki12
- Zenihiro, Juzo13
- Aumann, Thomas3
- 1. TU Darmstadt/GSI/Riken
- 2. Riken/RCNP
- 3. TU Darmstadt/GSI
- 4. RCNP
- 5. Peking University
- 6. TU Darmstadt
- 7. Kyoto University
- 8. Riken
- 9. Miyazaki University
- 10. Tohoku University
- 11. CNS
- 12. JAEA
- 13. Riken/Kyoto University
Description
The surface of neutron-rich heavy nuclei, with a neutron skin created by excess neutrons, provides an important terrestrial model system to study dilute neutron-rich matter. By employing quasi-free α-cluster-knockout reactions, we obtained direct experimental evidence for the formation of α clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between α-cluster formation and the neutron skin. This result, in turn, calls for a revision of the correlation between the neutron-skin thickness and the density dependence of the symmetry energy, which is essential for understanding neutron stars. Our result also provides a natural explanation for the origin of α particles in α decay.
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