Decay properties of the level 3$^-_1$ in $^{96}$Mo

E.T. Gregor , N.N. Arsenyev , M. Scheck , T.M. Shneidman , M. Thürauf , C. Bernards , A. Blanc (1) , R. Chapman , F. Drouet (2) , A.A. Dzhioev , G. de France (3) , M. Jentschel (1) , J. Jolie , J.M. Keatings , Th Kröll , U. Köster (1) , R. Leguillon (4) , K.R. Mashtakov , P. Mutti (1) , D. O'Donnell , C.M. Petrache (4) , G.S. Simpson (2) , J. Sinclair , J.F. Smith , T. Soldner (1) , P. Spagnoletti , A.V. Sushkov , W. Urban (1) , A. Vancraeyenest (1) , J.R. Vanhoy , V. Werner , K.O. Zell , M. Zielińska (5)

1 ILL - Institut Laue-Langevin
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 GANIL - Grand Accélérateur National d'Ions Lourds
4 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

The first excited level of 96Mo was investigated in a high-statistics experiment using the 95Mo(n, γγ) cold neutron capture reaction. The measurements used the high cold neutron flux from the research reactor at Institut Laue-Langevin and employed the highly-efficient EXILL array to detect γ-ray coincidences. The recorded statistics allow identification of decay branches with only a small relative intensity including the E3 decay. With the knowledge of the newly measured branching ratio and the known transition probability, the lifetime of the level was determined and, subsequently, the strength of the other decay branches of the octupole phonon were calculated. The extracted electromagnetic decay strengths are compared to the systematics of the stable even–even molybdenum isotopes and values calculated in a Skyrme-force based quasiparticle random phase approximation and in a cluster approach. Additionally, the decay branch to the low-lying quadrupole isovector level was observed.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

E.T. Gregor, N.N. Arsenyev, M. Scheck, T.M. Shneidman, M. Thürauf, et al.. Decay properties of the level 3$^-_1$ in $^{96}$Mo. J.Phys.G, 2019, 46 (7), pp.075101. ⟨10.1088/1361-6471/ab0b5e⟩. ⟨hal-02153630⟩