First identification of excited states in 78Zr and implications for isospin nonconserving forces in nuclei

G. L. Zimba; P. Ruotsalainen; D. G. Jenkins; W. Satuła; J. Uusitalo; R. Wadsworth; X. Pereira Lopez; K. Auranen; A. D. Briscoe; B. Cederwall; S. Chen; G. de Angelis; M. Doncel; A. Ertoprak; T. Grahn; P. T. Greenlees; A. Illana; H. Joukainen; R. Julin; H. Jutila; J. Keatings; J. Louko; M. Luoma; A.M. Plaza; J. Sarén; B. S. Nara Singh; J. Ojala; J. Pakarinen; P. Rahkila; J. Romero; A. Sood; A. Stott; C. Sullivan; H. Tann; A. Tolosa Delgado

doi:10.1103/PhysRevLett.134.022502

First identification of excited states in ⁷⁸Zr and implications for isospin nonconserving forces in nuclei

G. L. Zimba^*
, P. Ruotsalainen
, D. G. Jenkins
, W. Satuła
, J. Uusitalo
, R. Wadsworth
, X. Pereira Lopez
, K. Auranen
, A. D. Briscoe
, B. Cederwall
, S. Chen
, G. de Angelis
, M. Doncel
, A. Ertoprak
, T. Grahn
, P. T. Greenlees
, A. Illana
, H. Joukainen
, R. Julin
, H. Jutila

J. Keatings, J. Louko, M. Luoma, A.M. Plaza, J. Sarén, B. S. Nara Singh, J. Ojala, J. Pakarinen, P. Rahkila, J. Romero, A. Sood, A. Stott, C. Sullivan, H. Tann, A. Tolosa Delgado

^*Corresponding author for this work

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

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Abstract

At a fundamental level, the interactions between protons and protons, protons and neutrons, and neutrons and neutrons are not identical. Such isospin nonconserving interactions emerge when comparing the excitation energy of analog states in 𝑇=1 triplet nuclei. Here, we extend such an analysis to the 𝐴 =78, 𝑇 =1 triplet system—the heaviest system for which such complete data exists—and find strong disagreement with contemporary theory. This was achieved by pioneering the technique of recoil-𝛽−𝛽 tagging to identify excited states in ⁷⁸Zr . We also established a ⁷⁸Zr
half-life of 25⁺¹⁷ ₋₈ ms and extended the 𝑇 =1 band in ⁷⁸Y
to 𝐽^𝜋=(10⁺).

Original language	English
Article number	022502
Number of pages	8
Journal	Physical Review Letters
Volume	134
DOIs	https://doi.org/10.1103/PhysRevLett.134.022502
Publication status	Published - 14 Jan 2025

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2024 11 12 Zimba et al First acceptedAccepted author manuscript, 718 KB

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Zimba, G. L., Ruotsalainen, P., Jenkins, D. G., Satuła, W., Uusitalo, J., Wadsworth, R., Pereira Lopez, X., Auranen, K., Briscoe, A. D., Cederwall, B., Chen, S., de Angelis, G., Doncel, M., Ertoprak, A., Grahn, T., Greenlees, P. T., Illana, A., Joukainen, H., Julin, R., ... Tolosa Delgado, A. (2025). First identification of excited states in ⁷⁸Zr and implications for isospin nonconserving forces in nuclei. Physical Review Letters, 134, Article 022502. https://doi.org/10.1103/PhysRevLett.134.022502

@article{ddd4012a1521487f978c5b9ab2339596,

title = "First identification of excited states in 78Zr and implications for isospin nonconserving forces in nuclei",

abstract = "At a fundamental level, the interactions between protons and protons, protons and neutrons, and neutrons and neutrons are not identical. Such isospin nonconserving interactions emerge when comparing the excitation energy of analog states in 𝑇=1 triplet nuclei. Here, we extend such an analysis to the 𝐴 =78, 𝑇 =1 triplet system—the heaviest system for which such complete data exists—and find strong disagreement with contemporary theory. This was achieved by pioneering the technique of recoil-𝛽−𝛽 tagging to identify excited states in 78Zr . We also established a 78Zr half-life of 25+17 −8 ms and extended the 𝑇 =1 band in 78Y to 𝐽𝜋=(10+).",

author = "Zimba, \{G. L.\} and P. Ruotsalainen and Jenkins, \{D. G.\} and W. Satu{\l}a and J. Uusitalo and R. Wadsworth and \{Pereira Lopez\}, X. and K. Auranen and Briscoe, \{A. D.\} and B. Cederwall and S. Chen and \{de Angelis\}, G. and M. Doncel and A. Ertoprak and T. Grahn and Greenlees, \{P. T.\} and A. Illana and H. Joukainen and R. Julin and H. Jutila and J. Keatings and J. Louko and M. Luoma and A.M. Plaza and J. Sar{\'e}n and \{Nara Singh\}, \{B. S.\} and J. Ojala and J. Pakarinen and P. Rahkila and J. Romero and A. Sood and A. Stott and C. Sullivan and H. Tann and \{Tolosa Delgado\}, A.",

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day = "14",

doi = "10.1103/PhysRevLett.134.022502",

language = "English",

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Zimba, GL, Ruotsalainen, P, Jenkins, DG, Satuła, W, Uusitalo, J, Wadsworth, R, Pereira Lopez, X, Auranen, K, Briscoe, AD, Cederwall, B, Chen, S, de Angelis, G, Doncel, M, Ertoprak, A, Grahn, T, Greenlees, PT, Illana, A, Joukainen, H, Julin, R, Jutila, H, Keatings, J, Louko, J, Luoma, M, Plaza, AM, Sarén, J, Nara Singh, BS, Ojala, J, Pakarinen, J, Rahkila, P, Romero, J, Sood, A, Stott, A, Sullivan, C, Tann, H & Tolosa Delgado, A 2025, 'First identification of excited states in ⁷⁸Zr and implications for isospin nonconserving forces in nuclei', Physical Review Letters, vol. 134, 022502. https://doi.org/10.1103/PhysRevLett.134.022502

TY - JOUR

T1 - First identification of excited states in 78Zr and implications for isospin nonconserving forces in nuclei

AU - Zimba, G. L.

AU - Ruotsalainen, P.

AU - Jenkins, D. G.

AU - Satuła, W.

AU - Uusitalo, J.

AU - Wadsworth, R.

AU - Pereira Lopez, X.

AU - Auranen, K.

AU - Briscoe, A. D.

AU - Cederwall, B.

AU - Chen, S.

AU - de Angelis, G.

AU - Doncel, M.

AU - Ertoprak, A.

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Illana, A.

AU - Joukainen, H.

AU - Julin, R.

AU - Jutila, H.

AU - Keatings, J.

AU - Louko, J.

AU - Luoma, M.

AU - Plaza, A.M.

AU - Sarén, J.

AU - Nara Singh, B. S.

AU - Ojala, J.

AU - Pakarinen, J.

AU - Rahkila, P.

AU - Romero, J.

AU - Sood, A.

AU - Stott, A.

AU - Sullivan, C.

AU - Tann, H.

AU - Tolosa Delgado, A.

PY - 2025/1/14

Y1 - 2025/1/14

N2 - At a fundamental level, the interactions between protons and protons, protons and neutrons, and neutrons and neutrons are not identical. Such isospin nonconserving interactions emerge when comparing the excitation energy of analog states in 𝑇=1 triplet nuclei. Here, we extend such an analysis to the 𝐴 =78, 𝑇 =1 triplet system—the heaviest system for which such complete data exists—and find strong disagreement with contemporary theory. This was achieved by pioneering the technique of recoil-𝛽−𝛽 tagging to identify excited states in 78Zr . We also established a 78Zr half-life of 25+17 −8 ms and extended the 𝑇 =1 band in 78Y to 𝐽𝜋=(10+).

AB - At a fundamental level, the interactions between protons and protons, protons and neutrons, and neutrons and neutrons are not identical. Such isospin nonconserving interactions emerge when comparing the excitation energy of analog states in 𝑇=1 triplet nuclei. Here, we extend such an analysis to the 𝐴 =78, 𝑇 =1 triplet system—the heaviest system for which such complete data exists—and find strong disagreement with contemporary theory. This was achieved by pioneering the technique of recoil-𝛽−𝛽 tagging to identify excited states in 78Zr . We also established a 78Zr half-life of 25+17 −8 ms and extended the 𝑇 =1 band in 78Y to 𝐽𝜋=(10+).

U2 - 10.1103/PhysRevLett.134.022502

DO - 10.1103/PhysRevLett.134.022502

M3 - Article

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 022502

ER -

First identification of excited states in 78Zr and implications for isospin nonconserving forces in nuclei

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First identification of excited states in ⁷⁸Zr and implications for isospin nonconserving forces in nuclei