Phys.Rev.Lett. 129, 172701 (2022)

V.H.Phong, S.Nishimura, G.Lorusso, T.Davinson, A.Estrade, O.Hall, T.Kawano, J.Liu, F.Montes, N.Nishimura, R.Grzywacz, K.P.Rykaczewski, J.Agramunt, D.S.Ahn, A.Algora, J.M.Allmond, H.Baba, S.Bae, N.T.Brewer, C.G.Bruno, R.Caballero-Folch, F.Calvino, P.J.Coleman-Smith, G.Cortes, I.Dillmann, C.Domingo-Pardo, A.Fijalkowska, N.Fukuda, S.Go, C.J.Griffin, J.Ha, L.J.Harkness-Brennan, T.Isobe, D.Kahl, L.H.Khiem, G.G.Kiss, A.Korgul, S.Kubono, M.Labiche, I.Lazarus, J.Liang, Z.Liu, K.Matsui, K.Miernik, B.Moon, A.I.Morales, P.Morrall, N.Nepal, R.D.Page, M.Piersa-Silkowska, V.F.E.Pucknell, B.C.Rasco, B.Rubio, H.Sakurai, Y.Shimizu, D.W.Stracener, T.Sumikama, H.Suzuki, J.L.Tain, H.Takeda, A.Tarifeno-Saldivia, A.Tolosa-Delgado

β-Delayed One and Two Neutron Emission Probabilities Southeast of ¹³²Sn and the Odd-Even Systematics in r-Process Nuclide Abundances

NUCLEAR REACTIONS ⁹Be(²³⁸U, F)¹²¹Rh/¹²²Rh/¹²³Rh/¹²⁴Rh/¹²⁵Rh/¹²³Pd/¹²⁴Pd/¹²⁵Pd/¹²⁶Pd/¹²⁷Pd/¹²⁸Pd/¹²⁶Ag/¹²⁷Ag/¹²⁸Ag/¹²⁹Ag/¹³⁰Ag/¹³¹Ag/¹²⁹Cd/¹³⁰Cd/¹³¹Cd/¹³²Cd/¹³³Cd/¹³⁴Cd/¹³¹In/¹³²In/¹³³In/¹³⁴In/¹³⁵In/¹³⁶In/¹³⁴Sn/¹³⁵Sn/¹³⁶Sn/¹³⁷Sn/¹³⁸Sn/¹³⁹Sn/¹³⁸Sb/¹³⁹Sb/¹⁴⁰Sb/¹⁴¹Sb, E=345 MeV/nucleon; measured fission fragments using BigRIPS and ZeroDegree spectrometers at RIBF-RIKEN facility for separation of fragments by A/Q and Z through measurements of time-of-flight (TOF), magnetic rigidity (Bρ) and energy loss (ΔE); deduced A/Q versus Z particle identification plots.

RADIOACTIVITY ^129,130,131Ag, ^{130,131,132,133}Cd, ¹³⁴Cd, ^{131,132,133,134,135,136}In, ^{134,135,136,137,138,139}Sn(β^-), (β^-n), (β^-2n)[from ⁹Be(²³⁸U, F), E=345 MeV/nucleon]; measured implanted ions, neutrons, β, γ, (implants)β-, (implants)β(1n)- and (implants)β(2n)-correlations, T_1/2 of decays of ground states using BRIKEN neutron counter with 140 ³He-filled proportional counters, AIDA array of DSSSDs for implants and β decays, two Clover HPGe detectors for γ radiation, and two thick plastic scintillators; deduced T_1/2, %β^-n or P_n, %β^-2n or P_2n from simultaneous fits of β^-, β^-1n and β^-2n-decay curves. Comparison with previous experimental results, and with theoretical predictions from quasiparticle random-phase approximation (QRPA), based on finite range droplet model (FRDM) and the relativistic Hartree-Bogoliubov (RHB) plus proton-neutron QRPA (pnQRPA).

doi: 10.1103/PhysRevLett.129.172701