Confirmation of Giant Pairing Vibration evidence in $$^{\mathrm {12,13}}$$ 12 , 13 C( $$^{\mathrm {18}}$$ 18 O, $$^{\mathrm {16}}$$ 16 O) $$^{\mathrm {14,15}}$$ 14 , 15 C reactions at 275 MeV
European Physical Journal A(2021)
摘要
The Giant Pairing Vibration (GPV) is a correlated two-nucleon excitation mode in atomic nuclei predicted long time ago. It is expected to be excited in two-nucleon transfer reactions, similarly to the pairing vibrations feeding the ground states of even-even nuclei near shell-closure. Recent experiments have provided evidence for this mode in
$$^{\mathrm {14}}$$
C and
$$^{\mathrm {15}}$$
C nuclei populated via
$$^{\mathrm {12}}$$
C,
$$^{\mathrm {13}}$$
C(
$$^{\mathrm {18}}$$
O,
$$^{\mathrm {16}}$$
O)
$$^{\mathrm {14}}$$
C,
$$^{\mathrm {15}}$$
C two-neutron transfer reactions at 84 MeV beam energy. In the present paper, new data show the persistence of the same structures in the energy spectra of
$$^{\mathrm {14}}$$
C and
$$^{\mathrm {15}}$$
C populated by the same reactions at a higher bombarding energy of 275 MeV. The extracted centroid, width, spin-parity and transition probability fully agree with the previous observation thus giving a robust confirmation that the GPV mode is populated in such transfer reactions.
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