Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI

S. Iimura; M. Rosenbusch; A. Takamine; Y. Tsunoda; M. Wada; S. Chen; D. S. Hou; W. Xian; H. Ishiyama; S. Yan; P. Schury; H. Crawford; P. Doornenbal; Y. Hirayama; Y. Ito; S. Kimura; T. Koiwai; T. M. Kojima; H. Koura; J. Lee; J. Liu; S. Michimasa; H. Miyatake; J. Y. Moon; S. Naimi; S. Nishimura; T. Niwase; A. Odahara; T. Otsuka; S. Paschalis; M. Petri; N. Shimizu; T. Sonoda; D. Suzuki; Y. X. Watanabe; K. Wimmer; H. Wollnik

doi:10.1103/PhysRevLett.130.012501

Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI

S. Iimura, M. Rosenbusch, A. Takamine, Y. Tsunoda, M. Wada, S. Chen, D. S. Hou, W. Xian, H. Ishiyama, S. Yan, P. Schury, H. Crawford, P. Doornenbal, Y. Hirayama, Y. Ito, S. Kimura, T. Koiwai, T. M. Kojima, H. Koura, J. LeeJ. Liu, S. Michimasa, H. Miyatake, J. Y. Moon, S. Naimi, S. Nishimura, T. Niwase, A. Odahara, T. Otsuka, S. Paschalis, M. Petri, N. Shimizu, T. Sonoda, D. Suzuki, Y. X. Watanabe, K. Wimmer, H. Wollnik

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

Abstract

The atomic masses of Sc55, Ti56,58, and V56-59 have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and delivered to the novel designed gas cell and multireflection system, which has been recently commissioned downstream of the ZeroDegree spectrometer following the BigRIPS separator. For Ti56,58 and V56-59, the mass uncertainties have been reduced down to the order of 10 keV, shedding new light on the N=34 shell effect in Ti and V isotopes by the first high-precision mass measurements of the critical species Ti58 and V59. With the new precision achieved, we reveal the nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap above the occupied νp3/2 orbit is identified as a feature unique to Ca. We perform new Monte Carlo shell model calculations including the νd5/2 and νg9/2 orbits and compare the results with conventional shell model calculations, which exclude the νg9/2 and the νd5/2 orbits. The comparison indicates that the shell gap reduction in Ti is related to a partial occupation of the higher orbitals for the outer two valence neutrons at N=34.

Original language	English
Article number	012501
Number of pages	6
Journal	Physical Review Letters
Volume	130
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.130.012501
Publication status	Published - 5 Jan 2023

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PhysRevLett.130.012501
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Iimura, S., Rosenbusch, M., Takamine, A., Tsunoda, Y., Wada, M., Chen, S., Hou, D. S., Xian, W., Ishiyama, H., Yan, S., Schury, P., Crawford, H., Doornenbal, P., Hirayama, Y., Ito, Y., Kimura, S., Koiwai, T., Kojima, T. M., Koura, H., ... Wollnik, H. (2023). Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI. Physical Review Letters, 130(1), Article 012501. https://doi.org/10.1103/PhysRevLett.130.012501

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title = "Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI",

abstract = "The atomic masses of Sc55, Ti56,58, and V56-59 have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and delivered to the novel designed gas cell and multireflection system, which has been recently commissioned downstream of the ZeroDegree spectrometer following the BigRIPS separator. For Ti56,58 and V56-59, the mass uncertainties have been reduced down to the order of 10 keV, shedding new light on the N=34 shell effect in Ti and V isotopes by the first high-precision mass measurements of the critical species Ti58 and V59. With the new precision achieved, we reveal the nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap above the occupied νp3/2 orbit is identified as a feature unique to Ca. We perform new Monte Carlo shell model calculations including the νd5/2 and νg9/2 orbits and compare the results with conventional shell model calculations, which exclude the νg9/2 and the νd5/2 orbits. The comparison indicates that the shell gap reduction in Ti is related to a partial occupation of the higher orbitals for the outer two valence neutrons at N=34.",

author = "S. Iimura and M. Rosenbusch and A. Takamine and Y. Tsunoda and M. Wada and S. Chen and Hou, {D. S.} and W. Xian and H. Ishiyama and S. Yan and P. Schury and H. Crawford and P. Doornenbal and Y. Hirayama and Y. Ito and S. Kimura and T. Koiwai and Kojima, {T. M.} and H. Koura and J. Lee and J. Liu and S. Michimasa and H. Miyatake and Moon, {J. Y.} and S. Naimi and S. Nishimura and T. Niwase and A. Odahara and T. Otsuka and S. Paschalis and M. Petri and N. Shimizu and T. Sonoda and D. Suzuki and Watanabe, {Y. X.} and K. Wimmer and H. Wollnik",

note = "{\textcopyright} 2023 American Physical Society. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details",

year = "2023",

month = jan,

day = "5",

doi = "10.1103/PhysRevLett.130.012501",

language = "English",

volume = "130",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "1",

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Iimura, S, Rosenbusch, M, Takamine, A, Tsunoda, Y, Wada, M, Chen, S, Hou, DS, Xian, W, Ishiyama, H, Yan, S, Schury, P, Crawford, H, Doornenbal, P, Hirayama, Y, Ito, Y, Kimura, S, Koiwai, T, Kojima, TM, Koura, H, Lee, J, Liu, J, Michimasa, S, Miyatake, H, Moon, JY, Naimi, S, Nishimura, S, Niwase, T, Odahara, A, Otsuka, T, Paschalis, S , Petri, M, Shimizu, N, Sonoda, T, Suzuki, D, Watanabe, YX, Wimmer, K & Wollnik, H 2023, 'Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI', Physical Review Letters, vol. 130, no. 1, 012501. https://doi.org/10.1103/PhysRevLett.130.012501

TY - JOUR

T1 - Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI

AU - Iimura, S.

AU - Rosenbusch, M.

AU - Takamine, A.

AU - Tsunoda, Y.

AU - Wada, M.

AU - Chen, S.

AU - Hou, D. S.

AU - Xian, W.

AU - Ishiyama, H.

AU - Yan, S.

AU - Schury, P.

AU - Crawford, H.

AU - Doornenbal, P.

AU - Hirayama, Y.

AU - Ito, Y.

AU - Kimura, S.

AU - Koiwai, T.

AU - Kojima, T. M.

AU - Koura, H.

AU - Lee, J.

AU - Liu, J.

AU - Michimasa, S.

AU - Miyatake, H.

AU - Moon, J. Y.

AU - Naimi, S.

AU - Nishimura, S.

AU - Niwase, T.

AU - Odahara, A.

AU - Otsuka, T.

AU - Paschalis, S.

AU - Petri, M.

AU - Shimizu, N.

AU - Sonoda, T.

AU - Suzuki, D.

AU - Watanabe, Y. X.

AU - Wimmer, K.

AU - Wollnik, H.

PY - 2023/1/5

Y1 - 2023/1/5

N2 - The atomic masses of Sc55, Ti56,58, and V56-59 have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and delivered to the novel designed gas cell and multireflection system, which has been recently commissioned downstream of the ZeroDegree spectrometer following the BigRIPS separator. For Ti56,58 and V56-59, the mass uncertainties have been reduced down to the order of 10 keV, shedding new light on the N=34 shell effect in Ti and V isotopes by the first high-precision mass measurements of the critical species Ti58 and V59. With the new precision achieved, we reveal the nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap above the occupied νp3/2 orbit is identified as a feature unique to Ca. We perform new Monte Carlo shell model calculations including the νd5/2 and νg9/2 orbits and compare the results with conventional shell model calculations, which exclude the νg9/2 and the νd5/2 orbits. The comparison indicates that the shell gap reduction in Ti is related to a partial occupation of the higher orbitals for the outer two valence neutrons at N=34.

AB - The atomic masses of Sc55, Ti56,58, and V56-59 have been determined using the high-precision multireflection time-of-flight technique. The radioisotopes have been produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) and delivered to the novel designed gas cell and multireflection system, which has been recently commissioned downstream of the ZeroDegree spectrometer following the BigRIPS separator. For Ti56,58 and V56-59, the mass uncertainties have been reduced down to the order of 10 keV, shedding new light on the N=34 shell effect in Ti and V isotopes by the first high-precision mass measurements of the critical species Ti58 and V59. With the new precision achieved, we reveal the nonexistence of the N=34 empirical two-neutron shell gaps for Ti and V, and the enhanced energy gap above the occupied νp3/2 orbit is identified as a feature unique to Ca. We perform new Monte Carlo shell model calculations including the νd5/2 and νg9/2 orbits and compare the results with conventional shell model calculations, which exclude the νg9/2 and the νd5/2 orbits. The comparison indicates that the shell gap reduction in Ti is related to a partial occupation of the higher orbitals for the outer two valence neutrons at N=34.

UR - http://www.scopus.com/inward/record.url?scp=85146112568&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.130.012501

DO - 10.1103/PhysRevLett.130.012501

M3 - Article

C2 - 36669221

AN - SCOPUS:85146112568

SN - 0031-9007

VL - 130

JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

M1 - 012501

ER -

Study of the N=32 and N=34 Shell Gap for Ti and v by the First High-Precision Multireflection Time-of-Flight Mass Measurements at BigRIPS-SLOWRI

Abstract

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