The Hoyle State of 12C Nucleus in the 14N(γ, np)3α Reaction

Authors

  • S.N. Afanasiev National Science Center Kharkiv Institute of Physics and Technology

DOI:

https://doi.org/10.15407/ujpe67.11.776

Keywords:

photonuclear reactions, 4, ground state of 8Be nucleus, Hoyle state of 12C nucleus

Abstract

The distributions over the excitation energies of the systems of two and three α-particles in the 14N(γ, np)3α reaction have been analyzed. In the 2α-particle distribution, a channel of the 8Be nucleus formation in the ground state is revealed and resolved. For the events corresponding to this channel, a distribution of events over the excitation energy of three α-particles is plotted. A maximum is found in the near-threshold 3α-particle region, which can correspond to the Hoyle state of 12C nucleus. Events corresponding to the partial channel of the 14N(γ, np)12C*(0+) reaction with the subsequent two-particle decay 12C* → α + 8Be(0+) are separated, and the energy and angular distributions of α-particles at each decay stage are analyzed. The channel of 12C nucleus formation in the Hoyle state in photonuclear reactions has not been identified earlier.

References

F.-K. Thielemann, F. Brachwitz, C. Freiburghaus et al. Element synthesis in stars. Progr. Part. Nucl. Phys. 46, 5 (2001).

https://doi.org/10.1016/S0146-6410(01)00103-X

M. Freer, H.O.U. Fynbo. The Hoyle state in 12C. Progr. Part. Nucl. Phys. 78, 1 (2014).

https://doi.org/10.1016/j.ppnp.2014.06.001

A.C. Dreyfuss, K.D. Launey, T. Dytrych et al. Hoyle state and rotational features in Carbon-12 within a no-core shellmodel framework. Phys. Lett. B 727, 511 (2013).

https://doi.org/10.1016/j.physletb.2013.10.048

H. Morinaga. Interpretation of some of the excited states of 4n self-conjugate nuclei. Phys. Rev. 101, 254 (1956).

https://doi.org/10.1103/PhysRev.101.254

M. Itoh, H. Akimune, M. Fujiwara et al. Candidate for the 2+ excited Hoyle state at Ex∼10 MeV in 12C. Phys. Rev. C 84, 054308 (2011).

R. Bijker, F. Iachello. The algebraic cluster model: threebody clusters. Ann. Phys. 298, 334 (2002).

https://doi.org/10.1006/aphy.2002.6255

D.J. Marin-Lambarri, R. Bijker, M. Freer et al. Evidence for triangular D3h symmetry in 12C. Phys. Rev. Lett. 113, 012502 (2014).

Y. Kanada-EnпїЅyo. The structure of ground and excited states of 12C. Progr. Theor. Phys. 117, 655 (2007).

https://doi.org/10.1143/PTP.117.655

M. Chernykh, H. Feldmeier, T. Neff. The structure of the Hoyle state in 12C. Phys. Rev. Lett. 98, 032501 (2007).

https://doi.org/10.1103/PhysRevLett.98.032501

Y. Funaki, H. Horiuchi, W. von Oertzen et al. Concepts of nuclear α-particle condensation. Phys. Rev. C 80, 064326 (2009).

https://doi.org/10.1103/PhysRevC.80.064326

E. Epelbaum, H. Krebs, T.A. Lahde et al. Viability of carbon-based life as a function of the light quark mass. Phys. Rev. Lett. 110, 112502 (2013).

https://doi.org/10.1103/PhysRevLett.110.112502

Ad.R. Raduta, B. Borderie, E. Geraci et al. Evidence for α-particle condensation in nuclei from the Hoyle state deexcitation. Phys. Lett. B 705, 65 (2011).

https://doi.org/10.1016/j.physletb.2011.10.008

D. Dell'Aquila, I. Lombardo, G. Verde et al. High-precision probe of the fully sequential decay width of the Hoyle state in 12C. Phys. Rev. Lett. 119, 132501 (2017).

https://doi.org/10.1103/PhysRevLett.119.132501

R. Smith, Tz. Kokalova, C. Wheldon et al. New measurement of the direct 3α decay from the 12C Hoyle state. Phys. Rev. Lett. 119, 132502 (2017).

T.K. Rana, S. Bhattacharya, C. Bhattacharya et al. New high precision study on the decay width of the Hoyle state in 12C. Phys. Lett. B 793, 130 (2019).

https://doi.org/10.1016/j.physletb.2019.04.028

J. Bishop, G.V. Rogachev, S. Ahn et al. Almost mediumfree measurement of the Hoyle state direct-decay component with a TPC. Phys. Rev. C 102, 041303(R) (2020).

https://doi.org/10.1103/PhysRevC.102.041303

Serhii N. Afanasiev. Study of 14N(γ, np)3α reaction for Eγ up to 150 MeV. East Eur. J. Phys. 1, 5 (2022).

https://doi.org/10.26565/2312-4334-2022-1-01

D.R. Tilley, J.H. Kelley, J.L. Godwin et al. Energy levels of light nuclei A = 8, 9, 10. Nucl. Phys. A 745, 155 (2004).

https://doi.org/10.1016/j.nuclphysa.2004.09.059

F. Ajzenberg-Selove. Energy levels of light nuclei A = 11-12. Nucl. Phys. A 506, 1 (1990).

https://doi.org/10.1016/0375-9474(90)90271-M

Published

2023-01-23

How to Cite

Afanasiev, S. (2023). The Hoyle State of 12C Nucleus in the 14N(γ, np)3α Reaction. Ukrainian Journal of Physics, 67(11), 776. https://doi.org/10.15407/ujpe67.11.776

Issue

Section

Fields and elementary particles