Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy

B. Moon; W. Korten; K. Wimmer; P. Doornenbal; T.R. Rodríguez; N. Aoi; H. Baba; F. Browne; C. Campbell; S. Chen; H. Crawford; H. de Witte; C. Fransen; H. Hess; E. Ideguchi; S. Iwazaki; N. Kitamura; A. Kohda; T. Koiwai; B. Mauss; R. Mizuno; M. Niikura; T. Parry; P. Reiter; H. Sakurai; D. Suzuki; R. Taniuchi; S. Thiel; Y. Yamamoto

doi:10.1016/j.physletb.2024.139047

Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy

B. Moon, W. Korten, K. Wimmer, P. Doornenbal, T.R. Rodríguez, N. Aoi, H. Baba, F. Browne, C. Campbell, S. Chen, H. Crawford, H. de Witte, C. Fransen, H. Hess, E. Ideguchi, S. Iwazaki, N. Kitamura, A. Kohda, T. Koiwai, B. MaussR. Mizuno, M. Niikura, T. Parry, P. Reiter, H. Sakurai, D. Suzuki, R. Taniuchi, S. Thiel, Y. Yamamoto

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the E(21+) and R4/2=E(41+)/E(21+) values of 110Zr could be significantly improved. The low-lying 22+ states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards N=70. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.

Original language	English
Article number	139047
Number of pages	6
Journal	Physics Letters B
Volume	858
Early online date	10 Oct 2024
DOIs	https://doi.org/10.1016/j.physletb.2024.139047
Publication status	Published - Nov 2024

Bibliographical note

Keywords

Triaxial deformation
Harmonic-oscillator shell closure
Lifetime measurement
In-beam -ray spectroscopy

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Cite this

Moon, B., Korten, W., Wimmer, K., Doornenbal, P., Rodríguez, T. R., Aoi, N., Baba, H., Browne, F., Campbell, C., Chen, S., Crawford, H., de Witte, H., Fransen, C., Hess, H., Ideguchi, E., Iwazaki, S., Kitamura, N., Kohda, A., Koiwai, T., ... Yamamoto, Y. (2024). Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy. Physics Letters B, 858, Article 139047. https://doi.org/10.1016/j.physletb.2024.139047

@article{d5694b7bd0464e4aa62e8aa9538ce934,

title = "Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy",

abstract = "Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the E(21+) and R4/2=E(41+)/E(21+) values of 110Zr could be significantly improved. The low-lying 22+ states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards N=70. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.",

keywords = "Triaxial deformation, Harmonic-oscillator shell closure, Lifetime measurement, In-beam -ray spectroscopy",

author = "B. Moon and W. Korten and K. Wimmer and P. Doornenbal and T.R. Rodr{\'i}guez and N. Aoi and H. Baba and F. Browne and C. Campbell and S. Chen and H. Crawford and {de Witte}, H. and C. Fransen and H. Hess and E. Ideguchi and S. Iwazaki and N. Kitamura and A. Kohda and T. Koiwai and B. Mauss and R. Mizuno and M. Niikura and T. Parry and P. Reiter and H. Sakurai and D. Suzuki and R. Taniuchi and S. Thiel and Y. Yamamoto",

note = "{\textcopyright} 2024 The Author(s).",

year = "2024",

month = nov,

doi = "10.1016/j.physletb.2024.139047",

language = "English",

volume = "858",

journal = "Physics Letters B",

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Moon, B, Korten, W, Wimmer, K, Doornenbal, P, Rodríguez, TR, Aoi, N, Baba, H, Browne, F, Campbell, C, Chen, S, Crawford, H, de Witte, H, Fransen, C, Hess, H, Ideguchi, E, Iwazaki, S, Kitamura, N, Kohda, A, Koiwai, T, Mauss, B, Mizuno, R, Niikura, M, Parry, T, Reiter, P, Sakurai, H, Suzuki, D, Taniuchi, R, Thiel, S & Yamamoto, Y 2024, 'Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy', Physics Letters B, vol. 858, 139047. https://doi.org/10.1016/j.physletb.2024.139047

TY - JOUR

T1 - Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy

AU - Moon, B.

AU - Korten, W.

AU - Wimmer, K.

AU - Doornenbal, P.

AU - Rodríguez, T.R.

AU - Aoi, N.

AU - Baba, H.

AU - Browne, F.

AU - Campbell, C.

AU - Chen, S.

AU - Crawford, H.

AU - de Witte, H.

AU - Fransen, C.

AU - Hess, H.

AU - Ideguchi, E.

AU - Iwazaki, S.

AU - Kitamura, N.

AU - Kohda, A.

AU - Koiwai, T.

AU - Mauss, B.

AU - Mizuno, R.

AU - Niikura, M.

AU - Parry, T.

AU - Reiter, P.

AU - Sakurai, H.

AU - Suzuki, D.

AU - Taniuchi, R.

AU - Thiel, S.

AU - Yamamoto, Y.

PY - 2024/11

Y1 - 2024/11

N2 - Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the E(21+) and R4/2=E(41+)/E(21+) values of 110Zr could be significantly improved. The low-lying 22+ states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards N=70. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.

AB - Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the E(21+) and R4/2=E(41+)/E(21+) values of 110Zr could be significantly improved. The low-lying 22+ states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards N=70. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.

KW - Triaxial deformation

KW - Harmonic-oscillator shell closure

KW - Lifetime measurement

KW - In-beam -ray spectroscopy

U2 - 10.1016/j.physletb.2024.139047

DO - 10.1016/j.physletb.2024.139047

M3 - Article

SN - 0370-2693

VL - 858

JO - Physics Letters B

JF - Physics Letters B

M1 - 139047

ER -