How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52

H. N. Liu; A. Obertelli; P. Doornenbal; C. A. Bertulani; G. Hagen; J. D. Holt; G. R. Jansen; T. D. Morris; A. Schwenk; R. Stroberg; N. Achouri; H. Baba; F. Browne; D. Calvet; F. Château; S. Chen; N. Chiga; A. Corsi; M. L. Cortés; A. Delbart; J. M. Gheller; A. Giganon; A. Gillibert; C. Hilaire; T. Isobe; T. Kobayashi; Y. Kubota; V. Lapoux; T. Motobayashi; I. Murray; H. Otsu; V. Panin; N. Paul; W. Rodriguez; H. Sakurai; M. Sasano; D. Steppenbeck; L. Stuhl; Y. L. Sun; Y. Togano; T. Uesaka; K. Wimmer; K. Yoneda; O. Aktas; T. Aumann; L. X. Chung; F. Flavigny; S. Franchoo; I. Gašparić; R. B. Gerst; J. Gibelin; K. I. Hahn; D. Kim; T. Koiwai; Y. Kondo; P. Koseoglou; J. Lee; C. Lehr; B. D. Linh; T. Lokotko; M. Maccormick; K. Moschner; T. Nakamura; S. Y. Park; D. Rossi; E. Sahin; D. Sohler; P. A. Söderström; S. Takeuchi; H. Törnqvist; V. Vaquero; V. Wagner; S. Wang; V. Werner; X. Xu; H. Yamada; D. Yan; Z. Yang; M. Yasuda; L. Zanetti

doi:10.1103/PhysRevLett.122.072502

How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52

H. N. Liu, A. Obertelli, P. Doornenbal, C. A. Bertulani, G. Hagen, J. D. Holt, G. R. Jansen, T. D. Morris, A. Schwenk, R. Stroberg, N. Achouri, H. Baba, F. Browne, D. Calvet, F. Château, S. Chen, N. Chiga, A. Corsi, M. L. Cortés, A. DelbartJ. M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe, T. Kobayashi, Y. Kubota, V. Lapoux, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas, T. Aumann, L. X. Chung, F. Flavigny, S. Franchoo, I. Gašparić, R. B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwai, Y. Kondo, P. Koseoglou, J. Lee, C. Lehr, B. D. Linh, T. Lokotko, M. Maccormick, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi, E. Sahin, D. Sohler, P. A. Söderström, S. Takeuchi, H. Törnqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti

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Abstract

The first γ-ray spectroscopy of Ar52, with the neutron number N=34, was measured using the K53(p,2p) one-proton removal reaction at ∼210 MeV/u at the RIBF facility. The 21+ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond Ca54, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 21+ systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in Ar52.

Original language	English
Article number	072502
Journal	Physical Review Letters
Volume	122
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.122.072502
State	Published - Feb 21 2019

Funding

We thank the RIKEN Nishina Center accelerator staff for their work in the primary beam delivery and the BigRIPS team for preparing the secondary beams. We thank Y. Utsuno for providing us the SDPF-MU calculated excitation energies for Ar isotopes and , and A. Poves for providing us the SDPF-U calculated excitation energies for Ar isotopes. The development of MINOS has been supported by the European Research Council through the ERC Grant No. MINOS-258567. H.\u2009N.\u2009L. thanks G. Schnabel and R. Taniuchi for valuable discussions about the significance level estimation and acknowledges the support from the Enhanced Eurotalents program (PCOFUND-GA-2013-600382) co-funded by CEA and the European Union. H.\u2009N.\u2009L., A.\u2009O. and A.\u2009S. acknowledge the support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project No. 279384907- SFB 1245. C.\u2009A.\u2009B. acknowledges support from the U.S. NSF Grant No. 1415656 and the U.S. DOE Grant No. DE-FG02-08ER41533. J.\u2009D.\u2009H. and R.\u2009S. acknowledge the support from NSERC and the National Research Council Canada. Y.\u2009L.\u2009S. acknowledges the support of Marie Sk\u0142odowska-Curie Individual Fellowship (H2020-MSCA-IF-2015-705023) from the European Union. I.\u2009G. has been supported by HIC for FAIR and Croatian Science Foundation. L.\u2009X.\u2009C. and B.\u2009D.\u2009L. have been supported by the Vietnam MOST through the Physics Development Program Grant No. \u0110T\u0110LCN.25/18. K.\u2009I.\u2009H., D.\u2009K. and S.\u2009Y.\u2009P. have been supported by the NRF grant funded by the Korea government (No. 2017R1A2B2012382 and 2018R1A5A1025563). This work was supported in part by JSPS KAKENHI Grant No. 16H02179, MEXT KAKENHI Grants No. 24105005 and No. 18H05404. This work was also supported by the Office of Nuclear Physics, U.S. Department of Energy, under Grants No. de-sc0018223 (NUCLEI SciDAC-4 collaboration) and the Field Work Proposal ERKBP72 at Oak Ridge National Laboratory (ORNL). Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This research used resources of the Oak Ridge Leadership Computing Facility located at ORNL, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725.

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Liu, H. N., Obertelli, A., Doornenbal, P., Bertulani, C. A., Hagen, G., Holt, J. D., Jansen, G. R., Morris, T. D., Schwenk, A., Stroberg, R., Achouri, N., Baba, H., Browne, F., Calvet, D., Château, F., Chen, S., Chiga, N., Corsi, A., Cortés, M. L., ... Zanetti, L. (2019). How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52. Physical Review Letters, 122(7), Article 072502. https://doi.org/10.1103/PhysRevLett.122.072502

@article{a39251f974bf48738634558256c0292c,

title = "How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52",

abstract = "The first γ-ray spectroscopy of Ar52, with the neutron number N=34, was measured using the K53(p,2p) one-proton removal reaction at ∼210 MeV/u at the RIBF facility. The 21+ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond Ca54, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 21+ systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in Ar52.",

author = "Liu, {H. N.} and A. Obertelli and P. Doornenbal and Bertulani, {C. A.} and G. Hagen and Holt, {J. D.} and Jansen, {G. R.} and Morris, {T. D.} and A. Schwenk and R. Stroberg and N. Achouri and H. Baba and F. Browne and D. Calvet and F. Ch{\^a}teau and S. Chen and N. Chiga and A. Corsi and Cort{\'e}s, {M. L.} and A. Delbart and Gheller, {J. M.} and A. Giganon and A. Gillibert and C. Hilaire and T. Isobe and T. Kobayashi and Y. Kubota and V. Lapoux and T. Motobayashi and I. Murray and H. Otsu and V. Panin and N. Paul and W. Rodriguez and H. Sakurai and M. Sasano and D. Steppenbeck and L. Stuhl and Sun, {Y. L.} and Y. Togano and T. Uesaka and K. Wimmer and K. Yoneda and O. Aktas and T. Aumann and Chung, {L. X.} and F. Flavigny and S. Franchoo and I. Ga{\v s}pari{\'c} and Gerst, {R. B.} and J. Gibelin and Hahn, {K. I.} and D. Kim and T. Koiwai and Y. Kondo and P. Koseoglou and J. Lee and C. Lehr and Linh, {B. D.} and T. Lokotko and M. Maccormick and K. Moschner and T. Nakamura and Park, {S. Y.} and D. Rossi and E. Sahin and D. Sohler and S{\"o}derstr{\"o}m, {P. A.} and S. Takeuchi and H. T{\"o}rnqvist and V. Vaquero and V. Wagner and S. Wang and V. Werner and X. Xu and H. Yamada and D. Yan and Z. Yang and M. Yasuda and L. Zanetti",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",

year = "2019",

month = feb,

day = "21",

doi = "10.1103/PhysRevLett.122.072502",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "7",

}

Liu, HN, Obertelli, A, Doornenbal, P, Bertulani, CA, Hagen, G, Holt, JD, Jansen, GR , Morris, TD, Schwenk, A, Stroberg, R, Achouri, N, Baba, H, Browne, F, Calvet, D, Château, F, Chen, S, Chiga, N, Corsi, A, Cortés, ML, Delbart, A, Gheller, JM, Giganon, A, Gillibert, A, Hilaire, C, Isobe, T, Kobayashi, T, Kubota, Y, Lapoux, V, Motobayashi, T, Murray, I, Otsu, H, Panin, V, Paul, N, Rodriguez, W, Sakurai, H, Sasano, M, Steppenbeck, D, Stuhl, L, Sun, YL, Togano, Y, Uesaka, T, Wimmer, K, Yoneda, K, Aktas, O, Aumann, T, Chung, LX, Flavigny, F, Franchoo, S, Gašparić, I, Gerst, RB, Gibelin, J, Hahn, KI, Kim, D, Koiwai, T, Kondo, Y, Koseoglou, P, Lee, J, Lehr, C, Linh, BD, Lokotko, T, Maccormick, M, Moschner, K, Nakamura, T, Park, SY, Rossi, D, Sahin, E, Sohler, D, Söderström, PA, Takeuchi, S, Törnqvist, H, Vaquero, V, Wagner, V, Wang, S, Werner, V, Xu, X, Yamada, H, Yan, D, Yang, Z, Yasuda, M & Zanetti, L 2019, 'How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52', Physical Review Letters, vol. 122, no. 7, 072502. https://doi.org/10.1103/PhysRevLett.122.072502

TY - JOUR

T1 - How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52

AU - Liu, H. N.

AU - Obertelli, A.

AU - Doornenbal, P.

AU - Bertulani, C. A.

AU - Hagen, G.

AU - Holt, J. D.

AU - Jansen, G. R.

AU - Morris, T. D.

AU - Schwenk, A.

AU - Stroberg, R.

AU - Achouri, N.

AU - Baba, H.

AU - Browne, F.

AU - Calvet, D.

AU - Château, F.

AU - Chen, S.

AU - Chiga, N.

AU - Corsi, A.

AU - Cortés, M. L.

AU - Delbart, A.

AU - Gheller, J. M.

AU - Giganon, A.

AU - Gillibert, A.

AU - Hilaire, C.

AU - Isobe, T.

AU - Kobayashi, T.

AU - Kubota, Y.

AU - Lapoux, V.

AU - Motobayashi, T.

AU - Murray, I.

AU - Otsu, H.

AU - Panin, V.

AU - Paul, N.

AU - Rodriguez, W.

AU - Sakurai, H.

AU - Sasano, M.

AU - Steppenbeck, D.

AU - Stuhl, L.

AU - Sun, Y. L.

AU - Togano, Y.

AU - Uesaka, T.

AU - Wimmer, K.

AU - Yoneda, K.

AU - Aktas, O.

AU - Aumann, T.

AU - Chung, L. X.

AU - Flavigny, F.

AU - Franchoo, S.

AU - Gašparić, I.

AU - Gerst, R. B.

AU - Gibelin, J.

AU - Hahn, K. I.

AU - Kim, D.

AU - Koiwai, T.

AU - Kondo, Y.

AU - Koseoglou, P.

AU - Lee, J.

AU - Lehr, C.

AU - Linh, B. D.

AU - Lokotko, T.

AU - Maccormick, M.

AU - Moschner, K.

AU - Nakamura, T.

AU - Park, S. Y.

AU - Rossi, D.

AU - Sahin, E.

AU - Sohler, D.

AU - Söderström, P. A.

AU - Takeuchi, S.

AU - Törnqvist, H.

AU - Vaquero, V.

AU - Wagner, V.

AU - Wang, S.

AU - Werner, V.

AU - Xu, X.

AU - Yamada, H.

AU - Yan, D.

AU - Yang, Z.

AU - Yasuda, M.

AU - Zanetti, L.

PY - 2019/2/21

Y1 - 2019/2/21

N2 - The first γ-ray spectroscopy of Ar52, with the neutron number N=34, was measured using the K53(p,2p) one-proton removal reaction at ∼210 MeV/u at the RIBF facility. The 21+ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond Ca54, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 21+ systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in Ar52.

AB - The first γ-ray spectroscopy of Ar52, with the neutron number N=34, was measured using the K53(p,2p) one-proton removal reaction at ∼210 MeV/u at the RIBF facility. The 21+ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond Ca54, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 21+ systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in Ar52.

UR - http://www.scopus.com/inward/record.url?scp=85062034151&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.122.072502

DO - 10.1103/PhysRevLett.122.072502

M3 - Article

C2 - 30848641

AN - SCOPUS:85062034151

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 072502

ER -

How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar 52

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