Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

I. Cox; Z. Y. Xu; R. Grzywacz; W. J. Ong; B. C. Rasco; N. Kitamura; D. Hoskins; S. Neupane; T. J. Ruland; J. M. Allmond; T. T. King; R. S. Lubna; K. P. Rykaczewski; H. Schatz; B. M. Sherrill; O. B. Tarasov; A. D. Ayangeakaa; H. C. Berg; D. L. Bleuel; G. Cerizza; J. Christie; A. Chester; J. Davis; C. Dembski; A. A. Doetsch; J. G. Duarte; A. Estrade; A. Fijałkowska; T. J. Gray; E. C. Good; K. Haak; S. Hanai; J. T. Harke; C. Harris; K. Hermansen; D. E.M. Hoff; R. Jain; M. Karny; K. Kolos; A. Laminack; S. N. Liddick; B. Longfellow; S. Lyons; M. Madurga; M. J. Mogannam; A. Nowicki; T. H. Ogunbeku; G. Owens-Fryar; M. M. Rajabali; A. L. Richard; E. K. Ronning; G. E. Rose; K. Siegl; M. Singh; A. Spyrou; A. Sweet; A. Tsantiri; W. B. Walters; R. Yokoyama

doi:10.1103/PhysRevLett.132.152503

Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

I. Cox, Z. Y. Xu, R. Grzywacz, W. J. Ong, B. C. Rasco, N. Kitamura, D. Hoskins, S. Neupane, T. J. Ruland, J. M. Allmond, T. T. King, R. S. Lubna, K. P. Rykaczewski, H. Schatz, B. M. Sherrill, O. B. Tarasov, A. D. Ayangeakaa, H. C. Berg, D. L. Bleuel, G. CerizzaJ. Christie, A. Chester, J. Davis, C. Dembski, A. A. Doetsch, J. G. Duarte, A. Estrade, A. Fijałkowska, T. J. Gray, E. C. Good, K. Haak, S. Hanai, J. T. Harke, C. Harris, K. Hermansen, D. E.M. Hoff, R. Jain, M. Karny, K. Kolos, A. Laminack, S. N. Liddick, B. Longfellow, S. Lyons, M. Madurga, M. J. Mogannam, A. Nowicki, T. H. Ogunbeku, G. Owens-Fryar, M. M. Rajabali, A. L. Richard, E. K. Ronning, G. E. Rose, K. Siegl, M. Singh, A. Spyrou, A. Sweet, A. Tsantiri, W. B. Walters, R. Yokoyama

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Abstract

The first complete measurement of the β-decay strength distribution of Cl281745 was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in Ar271845. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.

Original language	English
Article number	152503
Journal	Physical Review Letters
Volume	132
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.132.152503
State	Published - Apr 12 2024

Funding

We would like to thank the entire operations team at FRIB for reliable beam delivery during the experiment, and for all the work leading up to the experiment. Calculations for this work were performed using the kshell code . This material is based upon work supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contracts No. DE-AC52-07NA27344 (LLNL), No. DE-AC05-00OR22725 (ORNL), No. DE-FG02-96ER40983 (UTK), No. DE-SC0016988 (TTU), No. DE-SC0020451 (MSU), Award No. DE-SC0020451 (FRIB), and used resources of the Facility for Rare Isotope Beams (FRIB) Operations, which is a DOE Office of Science User Facility under Award No. DE-SC0023633. This work was also sponsored by the Stewardship Science Academic Alliances program through DOE Awards No. DE-NA0003899 (UTK) and No. DOE-DE-NA0003906 (MSU), NSF Major Research Instrumentation Program Grant No. 1919735 (UTK), and the US National Science Foundation under Grants No. PHY-1714153 (CMU), No. PHY-20-12040 (B.\u2009M.\u2009S., O.\u2009B.\u2009T.), and No. PHY-2209429 (H.\u2009S.). This material is based upon work supported by the Department of Energy National Nuclear Security Administration through the Nuclear Science and Security Consortium under Grant No. DE-NA0003996 and U.S. Department of Energy, National Nuclear Security Administration under Award No. DE-NA0003180 (MSU). S.\u2009L. and J.\u2009D. were supported by the Laboratory Directed Research and Development Program at Pacific Northwest National Laboratory operated by Battelle for the U.S. Department of Energy.

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10.1103/PhysRevLett.132.152503

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Cox, I., Xu, Z. Y., Grzywacz, R., Ong, W. J., Rasco, B. C., Kitamura, N., Hoskins, D., Neupane, S., Ruland, T. J., Allmond, J. M., King, T. T., Lubna, R. S., Rykaczewski, K. P., Schatz, H., Sherrill, B. M., Tarasov, O. B., Ayangeakaa, A. D., Berg, H. C., Bleuel, D. L., ... Yokoyama, R. (2024). Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator. Physical Review Letters, 132(15), Article 152503. https://doi.org/10.1103/PhysRevLett.132.152503

@article{8a4ce83e2c064c53867ed7cde3502c60,

title = "Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator",

abstract = "The first complete measurement of the β-decay strength distribution of Cl281745 was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in Ar271845. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.",

author = "I. Cox and Xu, {Z. Y.} and R. Grzywacz and Ong, {W. J.} and Rasco, {B. C.} and N. Kitamura and D. Hoskins and S. Neupane and Ruland, {T. J.} and Allmond, {J. M.} and King, {T. T.} and Lubna, {R. S.} and Rykaczewski, {K. P.} and H. Schatz and Sherrill, {B. M.} and Tarasov, {O. B.} and Ayangeakaa, {A. D.} and Berg, {H. C.} and Bleuel, {D. L.} and G. Cerizza and J. Christie and A. Chester and J. Davis and C. Dembski and Doetsch, {A. A.} and Duarte, {J. G.} and A. Estrade and A. Fija{\l}kowska and Gray, {T. J.} and Good, {E. C.} and K. Haak and S. Hanai and Harke, {J. T.} and C. Harris and K. Hermansen and Hoff, {D. E.M.} and R. Jain and M. Karny and K. Kolos and A. Laminack and Liddick, {S. N.} and B. Longfellow and S. Lyons and M. Madurga and Mogannam, {M. J.} and A. Nowicki and Ogunbeku, {T. H.} and G. Owens-Fryar and Rajabali, {M. M.} and Richard, {A. L.} and Ronning, {E. K.} and Rose, {G. E.} and K. Siegl and M. Singh and A. Spyrou and A. Sweet and A. Tsantiri and Walters, {W. B.} and R. Yokoyama",

note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society. ",

year = "2024",

month = apr,

day = "12",

doi = "10.1103/PhysRevLett.132.152503",

language = "English",

volume = "132",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "15",

}

Cox, I, Xu, ZY, Grzywacz, R, Ong, WJ, Rasco, BC, Kitamura, N, Hoskins, D, Neupane, S, Ruland, TJ , Allmond, JM , King, TT, Lubna, RS, Rykaczewski, KP, Schatz, H, Sherrill, BM, Tarasov, OB, Ayangeakaa, AD, Berg, HC, Bleuel, DL, Cerizza, G, Christie, J, Chester, A, Davis, J, Dembski, C, Doetsch, AA, Duarte, JG, Estrade, A, Fijałkowska, A, Gray, TJ, Good, EC, Haak, K, Hanai, S, Harke, JT, Harris, C, Hermansen, K, Hoff, DEM, Jain, R, Karny, M, Kolos, K, Laminack, A, Liddick, SN, Longfellow, B, Lyons, S, Madurga, M, Mogannam, MJ, Nowicki, A, Ogunbeku, TH, Owens-Fryar, G, Rajabali, MM, Richard, AL, Ronning, EK, Rose, GE, Siegl, K, Singh, M, Spyrou, A, Sweet, A, Tsantiri, A, Walters, WB & Yokoyama, R 2024, 'Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator', Physical Review Letters, vol. 132, no. 15, 152503. https://doi.org/10.1103/PhysRevLett.132.152503

TY - JOUR

T1 - Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

AU - Cox, I.

AU - Xu, Z. Y.

AU - Grzywacz, R.

AU - Ong, W. J.

AU - Rasco, B. C.

AU - Kitamura, N.

AU - Hoskins, D.

AU - Neupane, S.

AU - Ruland, T. J.

AU - Allmond, J. M.

AU - King, T. T.

AU - Lubna, R. S.

AU - Rykaczewski, K. P.

AU - Schatz, H.

AU - Sherrill, B. M.

AU - Tarasov, O. B.

AU - Ayangeakaa, A. D.

AU - Berg, H. C.

AU - Bleuel, D. L.

AU - Cerizza, G.

AU - Christie, J.

AU - Chester, A.

AU - Davis, J.

AU - Dembski, C.

AU - Doetsch, A. A.

AU - Duarte, J. G.

AU - Estrade, A.

AU - Fijałkowska, A.

AU - Gray, T. J.

AU - Good, E. C.

AU - Haak, K.

AU - Hanai, S.

AU - Harke, J. T.

AU - Harris, C.

AU - Hermansen, K.

AU - Hoff, D. E.M.

AU - Jain, R.

AU - Karny, M.

AU - Kolos, K.

AU - Laminack, A.

AU - Liddick, S. N.

AU - Longfellow, B.

AU - Lyons, S.

AU - Madurga, M.

AU - Mogannam, M. J.

AU - Nowicki, A.

AU - Ogunbeku, T. H.

AU - Owens-Fryar, G.

AU - Rajabali, M. M.

AU - Richard, A. L.

AU - Ronning, E. K.

AU - Rose, G. E.

AU - Siegl, K.

AU - Singh, M.

AU - Spyrou, A.

AU - Sweet, A.

AU - Tsantiri, A.

AU - Walters, W. B.

AU - Yokoyama, R.

PY - 2024/4/12

Y1 - 2024/4/12

N2 - The first complete measurement of the β-decay strength distribution of Cl281745 was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in Ar271845. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.

AB - The first complete measurement of the β-decay strength distribution of Cl281745 was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in Ar271845. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.

UR - http://www.scopus.com/inward/record.url?scp=85190477323&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.132.152503

DO - 10.1103/PhysRevLett.132.152503

M3 - Article

C2 - 38682970

AN - SCOPUS:85190477323

SN - 0031-9007

VL - 132

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 152503

ER -

Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

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