Abstract
The quantitative contributions of various direct three alpha decay mechanisms in the decay of the famous Hoyle state, the 02 + resonant excited state of 12 C at excitation energy of 7.65 MeV, has been estimated using 60 MeV α inelastic scattering on 12 C target in complete kinematical measurement. Simultaneous optimisation of three different distributions (the relative energy of 8 Be like pairs, the root mean square energy deviation and the radial projection of symmetric Dalitz plot) derived from the experimental data with those generated from the Monte Carlo simulated event sets, have been done to arrive at a consistent estimation of the contributions of various direct decay modes.
Highlights
The Hoyle state, second 02+ resonant excited state of 12C at an excitation energy of 7.654 MeV, plays an important role to understand a variety of problems of nuclear astrophysics such as elemental abundance as well as the stellar nucleosynthesis process as a whole [1,2]
The triple alpha reaction rate calculation assumed implicitly that the decay mechanism of Hoyle state in 12C is exclusively through sequential two-step process, i.e. through the intermediate ground state of 8Be nucleus [3]. The structure of this state has unusual in nature, as from nuclear structure point of view, there are many unanswered questions regarding the configuration of this state; from the cluster model, it has a linear chain like structure of three alpha particles [4] and at the same time from inelastic scattering it was found that this state has an abnormally larger radius compare to the ground state of 12C [5] and found possesses a gas like structure i.e., loosely bound 3α [6, 7]
Two double sided Si-strip detectors (DSSD) (each consists of 16 strips per side in mutually orthogonal directions) of 500 μm thickness have been used in forward direction to detect 3α decay from 12C* and one telescope consisting of a 50μm ΔE single-sided silicon strip detector (SSSD) (16 strips, each of dimension 50mm ×3mm) and 500μm as E (DSSD) in backward direction to detect the inelastically scattered alpha particle
Summary
The Hoyle state, second 02+ resonant excited state of 12C at an excitation energy of 7.654 MeV, plays an important role to understand a variety of problems of nuclear astrophysics such as elemental abundance as well as the stellar nucleosynthesis process as a whole [1,2]. The structure of this state has unusual in nature, as from nuclear structure point of view, there are many unanswered questions regarding the configuration of this state; from the cluster model, it has a linear chain like structure of three alpha particles [4] and at the same time from inelastic scattering it was found that this state has an abnormally larger radius compare to the ground state of 12C [5] and found possesses a gas like structure i.e., loosely bound 3α [6, 7] All these unusual properties of this state may change the decay mode of 12C, from which reaction rates for carbon as well as other heavy elements have been calculated [8]. We report a complete kinematical measurement of inelastic scattering of α on 12C at 60 MeV to study the various decay channels of Hoyle state with relatively higher in statistic compare to the previous measurement
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
