Nuclear Data Sheets for A = 156

Measurement of the energy, multiplicity and angular correlation of γ-rays from the thermal neutron capture reaction Gd(n, γ) using JPARC-ANNRI

“…The two histograms are normalized by the total number of events. We can see some prominent peaks at 181, 1187, 5903 and 6750 keV in the data, which agree with the values given in the Nuclear Data Sheets [13] within the present calibration error (20 keV). We do not observe these peaks in the MC.…”

“…We incorporated the GEANT4 MC simulation into the detector, and compared the data with the results of the MC simulation. We observed some prominent peaks at 181, 1187, 5903 and 6750 keV in our data and found that these peaks agree with those in Nuclear Data Sheets [13] within the present calibration error (20 keV), but we did not see such prominent peaks in the MC. On the other hand, we see strong peaks at 3576, 3740, 3840, 3920, 4016, 4117 and 4360 keV in the Geant4 simulation, but we did not see them in our data.…”

“…This shows the clear correlation between 6750 and 1187 keV, which come from the 7937-keV 2 − resonance of 158 Gd. According to the ENDF data sheet [13], the 1187-keV 2 + state decays to the 0 + ground state, either directly (45%) or through the 79-keV 2 + state (54%), as shown in Fig.7(b). In the latter case, we only see the 1108-keV peak (1187 -79 = 1108), since 79 keV is below the threshold.…”

Two-nucleon transfer reactions as a test of quantum phase transitions in nuclei

“…In order to test the features of the phase transitional behavior of two-nucleon transfer intensities, we have analyzed experiments in Gd, Sm and Nd [15][16][17][18][19][20][21][22][23][24]. To this end, we have first diagonalized the Hamiltonian, Eq.…”

E2 decay strength of the M1 scissors mode of Gd156Beck1, Beller2, Pietralla3 et al. 2017Phys. Rev. Lett.281210View full textAdd to dashboardCite

“…Instead, in the present work they are locally determined from an Fvector E2 transition discussed above and from the transition strength of 189(3) W.u. [33] for the F -scalar E2 transition from the 2 + 1 state to the ground state of the very same nucleus, 156 Gd. The corresponding reduction of (e π − e ν ) 2 by about one order of magnitude with respect to previous estimates [32], and a correspondingly small E2 excitation strength from the ground state, explains why the 2 + sc state has remained largely undetected in the past.…”