Two-phonon character of the lowestJπ=1−state of

Nuclear structure studies with the inelastic neutron scattering reaction and gamma-ray detection

“…A systematic examination of reduced E1 transition rates in the N = 82 region has been used to illustrate the ambiguities in determining the degree of nuclear collectivity from E1 strengths [ 12 ]. Other notable recent research accomplishments include the first observation of the two-phonon cascade of transitions from the (2 + ⊗ 3 − ) 1 − state of an N = 82 nucleus [ 13 ], thus confirming the two-phonon nature of this excitation, and the first direct lifetime measurements of M1 scissors mode excitations in deformed nuclei [ 14 ].…”

Low-spin states in86Kr from the(n,n′)reaction

“…Since 86 Kr is stable, the (n, n ′ ) reaction can be used to investigate states in this nucleus. This reaction tends to be very non-selective and populates the majority of off-yrast low-spin and low-excitation-energy states [13][14][15]. Due to the non-selective mode of the reaction used here all previously known levels [6] with excitation energy up to 3.7 MeV were observed, the excitation energies of some levels were more accurately determined, and one level at 2917-keV excitation energy was added in the present work.…”

Search for the electric dipole excitations to the3s1/2⊗[21+⊗Bryssinck1, Govor2, Ponomarev3 et al. 2000Phys. Rev. C16120View full textAdd to dashboardCite

“…The most direct experimental proof for an underlying two-phonon structure can be obtained from a measurement of the decay pattern of the twophonon states to their one-phonon components. This has been achieved up to now only in very few cases: 142 Nd, 144 Nd and 144 Sm [9][10][11][12][13]. In each of these nuclei, an enhanced B(E2)…”