Proposed experiment to measure $\gamma$-rays in high resolution hadron beam experiments $O(p,p’)X$ and $O(^3He,t)X$ and the detection of $\gamma$-rays in $\nu-^{16}O$ reactions

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Aithousa Mitropoulos

Aithousa Mitropoulos

Megaron, Athens - Greece


Mr Takaaki Mori (Okayama University)


The $\gamma$-rays produced from excited nuclei in neutral-current (NC) neutrino-oxygen (even charged-current (CC) $\nu-O$) interactions have not been measured at $E_{\nu}=10-100$ MeV. They are very important, since they will add extra signals or become unexpected background in Supernova neutrino detection. Neutrinos at $E_{\nu}=20-100$ MeV are expected to excite $1^-$ , $1^+$ and $2^-$ (giant resonances) in NC reactions $O(\nu, \nu’)O^*$, which decay to $^{15}N^*+p$ and $^{15}O^*+n$; the $\gamma$-rays are produced from $^{15}N^*$ and $^{15}O^*$. But, no previous experiments have checked such expectations. We show a proposed experiment to measure the $\gamma$-ray spectrum produced in the hadron beam experiments $O(p,p’)X$ ($\Delta T$=0,1) and $O(^3He,t)X$ ($\Delta T$=1) at RCNP(Osaka). They will give the information on the Fermi and Gamov-Teller transition strength from the ground state to the excited states of the oxygen, associated with the $\gamma$-ray production. Such experiment will further develop an initial measurement of the $\gamma$-ray spectrum in $O(p,2p)N$ reaction at RCNP (K.Kobayashi et al., nucl-ex/0604006).

Primary author

Mr Takaaki Mori (Okayama University)


Prof. Atsushi Tamii (RCNP, Osaka University) Prof. Hiroshi Toki (RCNP, Osaka University) Mr Ko Ueno (ICRR, Univ of Tokyo) Dr Makoto Sakuda (Okayama University) Prof. Masayuki Nakahata (ICRR, Univ of Tokyo)

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