Measurements of the reaction cross sections for Be and B isotopes at intermediate energies have not been systematically performed. Some of measurements showed that 11Be,14Be and 14B may be neutron halos. A new method ...Measurements of the reaction cross sections for Be and B isotopes at intermediate energies have not been systematically performed. Some of measurements showed that 11Be,14Be and 14B may be neutron halos. A new method for accurate measurement of nuclear reaction cross-section σR based on RIBLL was developed. The experimental setup at RIBLL is shown in Fig.1. The nuclear reaction cross-sections for 11.12.14Be展开更多
In 2014, the National Natural Science Foundation of China （NSFC） approved the Jinping Underground Nuclear Astrophysics laboratory （JUNA） project, which aims at direct cross-section measurements of four key stellar...In 2014, the National Natural Science Foundation of China （NSFC） approved the Jinping Underground Nuclear Astrophysics laboratory （JUNA） project, which aims at direct cross-section measurements of four key stellar nuclear reactions right down to the Gamow windows. In order to solve the observed fluorine overabundances in Asymptotic Giant Branch （AGB） stars, measuring the key 19F（p,a）16O reaction at effective burning energies （i.e., at Gamow window） is established as one of the scientific research sub-projects. The present paper describes this sub-project in details, including motivation, status, experimental setup, yield and background estimation, aboveground test, as well as other relevant reactions.展开更多
文摘Measurements of the reaction cross sections for Be and B isotopes at intermediate energies have not been systematically performed. Some of measurements showed that 11Be,14Be and 14B may be neutron halos. A new method for accurate measurement of nuclear reaction cross-section σR based on RIBLL was developed. The experimental setup at RIBLL is shown in Fig.1. The nuclear reaction cross-sections for 11.12.14Be
基金supported by the National Natural Science Foundation of China(Grant Nos.114905621149056011135005 and 11321064)
文摘In 2014, the National Natural Science Foundation of China （NSFC） approved the Jinping Underground Nuclear Astrophysics laboratory （JUNA） project, which aims at direct cross-section measurements of four key stellar nuclear reactions right down to the Gamow windows. In order to solve the observed fluorine overabundances in Asymptotic Giant Branch （AGB） stars, measuring the key 19F（p,a）16O reaction at effective burning energies （i.e., at Gamow window） is established as one of the scientific research sub-projects. The present paper describes this sub-project in details, including motivation, status, experimental setup, yield and background estimation, aboveground test, as well as other relevant reactions.
