We have found that the excited energy from the ground state with 1f7=2 configuration to the first excited state with 2p3=2 configuration in 37S is obviously lower compared with that in nearby N=21 isotones 35Si, 39Ar and 41Ca (see Fig. 1, The insert indicates the relevant single-particle orbits of proton and neutron). This interesting phenomenon may result from the collapse of N=28 closure, which gives the sufficient valence space for collective deformation which can been revealed from the B(E2) value. Therefore, to obtain the B(E2), we perform the experiments for measuring the lifetime of the first excited state in 37S.
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