학술논문
New Measurement of the Hoyle State Radiative Transition Width
Document Type
Working Paper
Author
Rana, T. K.; Pandit, Deepak; Manna, S.; Kundu, S.; Banerjee, K.; Sen, A.; Pandey, R.; Mukherjee, G.; Ghosh, T. K.; Nayak, S. S.; Shil, R.; Karmakar, P.; Atreya, K.; Rani, K.; Paul, D.; Santra, Rajkumar; Sultana, A.; Basu, S.; Pal, S.; Sadhukhan, S.; Mondal, Debasish; Mukhopadhyay, S.; Bhattacharya, Srijit; Pal, Surajit; Pant, Pankaj; Roy, Pratap; Ali, Sk M.; Mondal, S.; De, A.; Dey, Balaram; Datta, R.; Bhattacharya, S.; Bhattacharya, C.
Source
Subject
Language
Abstract
The radiative decay of the Hoyle state is the doorway to the production of heavier elements in stellar environment. Here we report, an exclusive measurement of electric quadruple (E$_2$) transitions of the Hoyle state to the ground state of $^{12}$C through the $^{12}$C(p, p$^\prime$$\gamma$$\gamma$)$^{12}$C reaction. Triple coincidence measurement yields a value of radiative branching ratio $\Gamma_{rad}$/$\Gamma$ = 4.01 (30) $\times$ 10$^{-4}$. The result has been corroborated by an independent experiment based on the complete kinematical measurement $via.$ $^{12}$C(p, p$^\prime$)$^{12}$C reaction ($\Gamma_{rad}$/$\Gamma$ = 4.04 (30) $\times$ 10$^{-4}$). Using our results together with the currently adopted values of $\Gamma_{\pi}$(E$_0$)/$\Gamma$ and $\Gamma_{\pi}$($E_0$), the radiative width of the Hoyle state is found to be 3.75 (40) $\times$ 10$^{-3}$ eV. We emphasize here that our result is not in agreement with 34 $\%$ increase in the radiative decay width of the Hoyle state measured recently but consistent with the currently adopted value.
Comment: 7 pages, 5 figures Submitted to Phys. Rev. Lett
Comment: 7 pages, 5 figures Submitted to Phys. Rev. Lett