Triplet energy differences and the low lying structure of Ga 62

T. W. Henry; M. A. Bentley; R. M. Clark; P. J. Davies; V. M. Bader; T. Baugher; D. Bazin; C. W. Beausang; J. S. Berryman; A. M. Bruce; C. M. Campbell; H. L. Crawford; M. Cromaz; P. Fallon; A. Gade; J. Henderson; H. Iwasaki; D. G. Jenkins; I. Y. Lee; A. Lemasson; S. M. Lenzi; A. O. Macchiavelli; D. R. Napoli; A. J. Nichols; Stefanos Paschalis; Marina Petri; F. Recchia; J. Rissanen; E. C. Simpson; S. R. Stroberg; R. Wadsworth; D. Weisshaar; A. Wiens; C. Walz

doi:10.1103/PhysRevC.92.024315

Triplet energy differences and the low lying structure of Ga 62

T. W. Henry, M. A. Bentley, R. M. Clark, P. J. Davies, V. M. Bader, T. Baugher, D. Bazin, C. W. Beausang, J. S. Berryman, A. M. Bruce, C. M. Campbell, H. L. Crawford, M. Cromaz, P. Fallon, A. Gade, J. Henderson, H. Iwasaki, D. G. Jenkins, I. Y. Lee, A. LemassonS. M. Lenzi, A. O. Macchiavelli, D. R. Napoli, A. J. Nichols, Stefanos Paschalis, Marina Petri, F. Recchia, J. Rissanen, E. C. Simpson, S. R. Stroberg, R. Wadsworth, D. Weisshaar, A. Wiens, C. Walz

Physics

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Abstract

Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62. Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed. Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction. Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.

Original language	English
Article number	024315
Number of pages	6
Journal	Physical Review C
Volume	92
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.92.024315
Publication status	Published - 20 Aug 2015

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10.1103/PhysRevC.92.024315

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Henry, T. W., Bentley, M. A., Clark, R. M., Davies, P. J., Bader, V. M., Baugher, T., Bazin, D., Beausang, C. W., Berryman, J. S., Bruce, A. M., Campbell, C. M., Crawford, H. L., Cromaz, M., Fallon, P., Gade, A., Henderson, J., Iwasaki, H., Jenkins, D. G., Lee, I. Y., ... Walz, C. (2015). Triplet energy differences and the low lying structure of Ga 62. Physical Review C, 92(2), Article 024315. https://doi.org/10.1103/PhysRevC.92.024315

@article{23d8aca2fe314468b185d0c41d6d0fb3,

title = "Triplet energy differences and the low lying structure of Ga 62",

abstract = "Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62. Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed. Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction. Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.",

author = "Henry, {T. W.} and Bentley, {M. A.} and Clark, {R. M.} and Davies, {P. J.} and Bader, {V. M.} and T. Baugher and D. Bazin and Beausang, {C. W.} and Berryman, {J. S.} and Bruce, {A. M.} and Campbell, {C. M.} and Crawford, {H. L.} and M. Cromaz and P. Fallon and A. Gade and J. Henderson and H. Iwasaki and Jenkins, {D. G.} and Lee, {I. Y.} and A. Lemasson and Lenzi, {S. M.} and Macchiavelli, {A. O.} and Napoli, {D. R.} and Nichols, {A. J.} and Stefanos Paschalis and Marina Petri and F. Recchia and J. Rissanen and Simpson, {E. C.} and Stroberg, {S. R.} and R. Wadsworth and D. Weisshaar and A. Wiens and C. Walz",

year = "2015",

month = aug,

day = "20",

doi = "10.1103/PhysRevC.92.024315",

language = "English",

volume = "92",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

}

Henry, TW, Bentley, MA, Clark, RM, Davies, PJ, Bader, VM, Baugher, T, Bazin, D, Beausang, CW, Berryman, JS, Bruce, AM, Campbell, CM, Crawford, HL, Cromaz, M, Fallon, P, Gade, A, Henderson, J, Iwasaki, H, Jenkins, DG, Lee, IY, Lemasson, A, Lenzi, SM, Macchiavelli, AO, Napoli, DR, Nichols, AJ, Paschalis, S , Petri, M, Recchia, F, Rissanen, J, Simpson, EC, Stroberg, SR, Wadsworth, R, Weisshaar, D, Wiens, A & Walz, C 2015, 'Triplet energy differences and the low lying structure of Ga 62', Physical Review C, vol. 92, no. 2, 024315. https://doi.org/10.1103/PhysRevC.92.024315

TY - JOUR

T1 - Triplet energy differences and the low lying structure of Ga 62

AU - Henry, T. W.

AU - Bentley, M. A.

AU - Clark, R. M.

AU - Davies, P. J.

AU - Bader, V. M.

AU - Baugher, T.

AU - Bazin, D.

AU - Beausang, C. W.

AU - Berryman, J. S.

AU - Bruce, A. M.

AU - Campbell, C. M.

AU - Crawford, H. L.

AU - Cromaz, M.

AU - Fallon, P.

AU - Gade, A.

AU - Henderson, J.

AU - Iwasaki, H.

AU - Jenkins, D. G.

AU - Lee, I. Y.

AU - Lemasson, A.

AU - Lenzi, S. M.

AU - Macchiavelli, A. O.

AU - Napoli, D. R.

AU - Nichols, A. J.

AU - Paschalis, Stefanos

AU - Petri, Marina

AU - Recchia, F.

AU - Rissanen, J.

AU - Simpson, E. C.

AU - Stroberg, S. R.

AU - Wadsworth, R.

AU - Weisshaar, D.

AU - Wiens, A.

AU - Walz, C.

PY - 2015/8/20

Y1 - 2015/8/20

N2 - Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62. Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed. Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction. Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.

AB - Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T=1, Jπ=2+ states is examined. The A=62 isobar is identified as having a TED value that deviates significantly from an otherwise very consistent trend. This deviation can be attributed to the tentative assignments of the pertinent states in Ga62 and Ge62. Methods: An in-beam γ-ray spectroscopy experiment was performed to identify excited states in Ga62 using Gamma-Ray Energy Tracking In-Beam Nuclear Array with the S800 spectrometer at NSCL using a two-nucleon knockout approach. Cross-section calculations for the knockout process and shell-model calculations have been performed to interpret the population and decay properties observed. Results: Using the systematics as a guide, a candidate for the transition from the T=1, 2+ state is identified. However, previous work has identified similar states with different Jπ assignments. Cross-section calculations indicate that the relevant T=1, 2+ state should be one of the states directly populated in this reaction. Conclusions: As spins and parities were not measurable, it is concluded that an unambiguous identification of the first T=1, 2+ state is required to reconcile our understanding of TED systematics.

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U2 - 10.1103/PhysRevC.92.024315

DO - 10.1103/PhysRevC.92.024315

M3 - Article

AN - SCOPUS:84940843727

SN - 0556-2813

VL - 92

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 024315

ER -

Triplet energy differences and the low lying structure of Ga 62

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Triplet energy differences and the low lying structure of Ga 62

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