Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Pedersen, L. G.*; Sahin, E.*; Grgen, A.*; Bello Garrote, F. L.*; Orlandi, R.; 他61名*
Acta Physica Polonica B; Proceedings Supplement, 16(4), p.4-A14_1 - 4-A14_6, 2023/08
被引用回数:0 パーセンタイル:0.00(Physics, Multidisciplinary)Excited states in Cu were observed for the first time following the
decay of
Ni created by in-flight fission of
U. Based on the coincidences with the observed
-ray transitions, a level scheme comprising eight excited states was constructed, with tentative spin assignments for 5 of them. In addition to the
-decaying states, an isomeric state with a lifetime of 3.8(4) ms was also found to decay by internal conversion.
Pedersen, L. G.*; Sahin, E.*; Grgen, A.*; Bello Garrote, F. L.*; 角田 佑介*; 大塚 孝治*; 新倉 潤*; Orlandi, R.; 他59名*
Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04
被引用回数:3 パーセンタイル:45.98(Physics, Nuclear)Nuclei in the vicinity of Ni (
=28,
=50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in
Cu were observed for the first time following the
-decay of
Ni, which was produced by in-flight fission of
U. Using
-ray coincidences, a level scheme comprising eight excited states was built. Using the observed
feeding and the
-decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the
-decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic
Ni core was obtained.
Bello Garrote, F. L.*; Sahin, E.*; 角田 佑介*; 大塚 孝治*; Grgen, A.*; Orlandi, R.; 他61名*
Physical Review C, 102(3), p.034314_1 - 034314_13, 2020/09
被引用回数:4 パーセンタイル:37.19(Physics, Nuclear)Detailed spectroscopy of neutron-rich odd- Cu isotopes is of great importance for studying the shell evolution in the region of
Ni. Excited states in
Cu were populated in the
decay of
Ni isotopes, which were produced by the in-flight fission at RIBF, RIKEN. The
Ni isotopes were separated, identified, and implanted in a highly segmented Si detector array for the detection of the
-decay electrons, while the delayed
rays were detected by an array of HPGe cluster detectors. A level scheme of
Cu was built up to
4 MeV, from which the location of the two previously known low-lying isomeric states was clarified. The level structure below 2 MeV was interpreted based on the results of the shell-model calculations and the systematics of odd-
Cu isotopes, revealing the evolution of single-particle states in this region.
Vaquero, V.*; Jungclaus, A.*; Doornenbal, P.*; Wimmer, K.*; Gargano, A.*; Tostevin, J. A.*; Chen, S.*; Ncher, E.*; Sahin, E.*; 志賀 慶明*; et al.
Physical Review Letters, 118(20), p.202502_1 - 202502_5, 2017/05
被引用回数:23 パーセンタイル:76.21(Physics, Multidisciplinary)Excited states in Sn were populated following one-neutron knockout reaction from an unstable
Sn beam at the RIBF laboratory in RIKEN. In addition to the already known
rays, additional
strength was observed for the first time in the excitation-energy range 3.5-5.5 MeV. Since the neutron separation energy of
Sn is low, this observation provides direct evidence for the radioactive decay of neutron-unbound states in this nucleus. The ability of
decay to compete with neutron emission was attributed to a mismatch between the wave functions of the initial and final states in the neutron emission case. These findings suggest that in the region south-east of
Sn, nuclear structure effects play a significant role in the decay of unbound states, which are instead usually ignored in the evaluation of neutron-emission probabilities in astrophysical simulations.
Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; 角田 佑介*; Otsuka, T.*; 西村 俊二*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; et al.
Physics Letters B, 765, p.328 - 333, 2017/02
被引用回数:38 パーセンタイル:92.42(Astronomy & Astrophysics)The level schemes of neutron-rich isotopes Co and
Ni were populated in the
decay of
Fe and studied using
-delayed
-ray spectroscopy of the
decay, at the RIBF in RIKEN, Japan. The experimental results were compared to state-of-the-art shell-model calculations, and indicate a dominance of prolate deformation in the low-lying states, coexisting with spherical states. The
decay of the
isobars is shown to progress in accordance to a new type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps.
Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; 西村 俊二*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; Lorusso, G.*; Patel, Z.*; et al.
Physical Review C, 93(3), p.034328_1 - 034328_14, 2016/03
被引用回数:26 パーセンタイル:83.44(Physics, Nuclear)Low-lying excited states in Ni have been investigated at RIKEN by studying the
decay of
Co to
Ni.
Co was separated with BigRIPS, implanted into the WaS3ABi Silicon array, and the
ray measured using the EURICA
spectrometer. From the analysis, 60 new
-ray transitions and 21 new levels in
Ni were observed. The new experimental information is compared to shell-model calculations which include neutron excitation across the
shell. The calculations reproduce rather well the observed states, implying that a clear understanding of these low-lying excitations has been achieved.
Benzoni, G.*; Morales, A. I.*; Watanabe, H.*; 西村 俊二*; Coraggio, L.*; Itaco, N.*; Gargano, A.*; Browne, F.*; Daido, R.*; Doornenbal, P.*; et al.
Physics Letters B, 751, p.107 - 112, 2015/12
被引用回数:20 パーセンタイル:75.34(Astronomy & Astrophysics)The decays of
Mn have been measured at the RIBF facility at RIKEN using the EURICA
spectrometer combined with an active stopper consisting of a stack of Si detectors. Half-lives and
-delayed neutron emission probabilities have been extracted for these decays, together with first experimental information on excited states populated in
Fe. The data indicate a continuously increasing deformation for Fe isotopes up to A=70, and interpreted to be due to the interplay between quadrupole correlation of specific neutron orbitals and the monopole component of the proton-neutron interaction.