Gamow--Teller Excitations Studied by Weak and Strong Interactions

Fujita, Yoshihiro; Rubio, B.; Adachi, Toshimi; Blank, Β.; Fujita, H.; Gelletly, W.; Molina, F.; Orrigo, S. E. A.

doi:10.5506/aphyspolb.46.657

Cited by 5 publications

(18 citation statements)

References 20 publications

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“…A quenching factor q F =0.74 to the GamowTeller (GT) operator is employed to calculate the β -decay strength distribution. The modern GXPF1J interaction has recently been used to reproduce various experimental GamowTeller (GT) strengths in the region close to A = 52 [39]. The calculated results are shown in the right part of Fig.…”

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confidence: 81%

“…2. The J π assignments for the levels in 52 Co are inferred from the analogous states in the mirror nucleus 52 Mn [39]. By using the IMME, the mass excess of 52 Ni is predicted to be ME( 52 Ni) = −22699 (22) keV and the Q EC value of 52 Ni is thus deduced to be 11662(23) keV.…”

mentioning

confidence: 99%

“…Hence, it is reasonable to assign the former as from the IAS in 52 Co with ME = −31426(10) keV, and the latter as from a 1 + state with ME = −31561(14) keV, which could be the analog 1 + state to the one identified in the mirror nucleus 52 Mn [38,39].…”

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confidence: 99%

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Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
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7
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Masses of 52g,52m Co were measured for the first time with an accuracy of ∼ 10 keV, an unprecedented precision reached for short-lived nuclei in the isochronous mass spectrometry. Combining our results with the previous β -γ measurements of 52 Ni, the T = 2, J π = 0 + isobaric analog state (IAS) in 52 Co was newly assigned, questioning the conventional identification of IASs from the β -delayed proton emissions. Using our energy of the IAS in 52 Co, the masses of the T = 2 multiplet fit well into the Isobaric Multiplet Mass Equation.We find that the IAS in 52 Co decays predominantly via γ transitions while the proton emission is negligibly small. According to our large-scale shell model calculations, this phenomenon has been interpreted to be due to very low isospin mixing in the IAS.PACS numbers: 21.10. Dr, 27.40.+z, 29.20.db The concept of isospin was introduced by Heisenberg [1] and developed by Wigner [2] to describe the charge independence of nuclear forces. This concept is being widely used in particle and nuclear physics [3, 4]. Within the isospin formalism, a nucleus composed of Z protons and N neutrons has a fixed isospin projection of T z = (N − Z)/2, while all states in the nucleus can have different total isospins T ≥ |T z |. In other words, states of a given T can occur in a set of isobaric nuclei with T z = T, T − 1, ..., −T . These states with the same T and J π are called the isobaric analog states (IAS). The states with T = |T z | are the ground states of the corresponding nuclei and the ones with T > |T z | are excited states, except for some oddodd N = Z nuclei [5,6]. A set of IASs with fixed A and T are believed to have very similar structure and properties and to be energetically degenerated in the framework of isospin symmetry. This energy degeneracy is mainly altered due to the Coulomb interaction, the proton-neutron mass difference, and the charge-dependent forces of nuclear origin [7]. In an isobaric multiplet, the masses of the IASs of a given T can be described in first order approximation by the famous quadratic * Corresponding author.

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confidence: 81%

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confidence: 99%

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Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
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7
0
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“…2. The J π assignments for the levels in 52 Co are inferred from the analogous states in the mirror nucleus 52 Mn [39]. By using the IMME, the mass excess of 52 Ni is predicted to be ME( 52 Ni) = −22699(22) keV and the Q EC value of 52 Ni is thus deduced to be 11662(23) keV.…”

Section: β -Decay Properties Of 52 Nimentioning

confidence: 99%

“…The absolute intensity of 42(10)% for the 2407-keV γ transition measured in 52 Co is much stronger than the 13.7(2)% 1352(10)-keV proton emission [26]. Hence, it is reasonable to assign the former as from the IAS in 52 Co with ME = −31426(10) keV, and the latter as from a 1 + state with ME = −31561(14) keV, which could be the analog 1 + state to the one identified in the mirror nucleus 52 Mn [38,39].…”

Section: Pos(inpc2016)025mentioning

confidence: 99%

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Zhang¹

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Mass excesses of 52 Co and its (2 + ) isomer are measured to be −34361(8) keV and −33974(10) keV using isochronous mass spectrometry at CSRe. Referring to the β -delayed γ emissions of 52 Ni, we identified a new excited state in 52 Co and assigned it as the T = 2, J π = 0 + isobaric analog state (IAS) of 52 Ni. This state is 135(17) keV less bound than that suggested previously based on the β -delayed protons of 52 Ni. We find that the mass of this IAS together with those of the IAS ′ s in 52 Fe, 52 Mn, and 52 Cr fit well into the Isobaric Multiplet Mass Equation.An interesting finding from this measurement is that the IAS in 52 Co decays dominantly via γ transitions while proton emission is almost negligible. This phenomenon could be due to very low isospin mixing according to the large-scale shell model calculations.

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Isochronous mass measurements of Tz=−1fp -shell nuclei from projectile fragmentation of Ni58

Zhang¹,

Zhang²,

Wang³

et al. 2018

Phys. Rev. C

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Gamow--Teller Excitations Studied by Weak and Strong Interactions

Cited by 5 publications

References 20 publications

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
0
7
0
View full text Add to dashboard Cite

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
0
7
0
View full text Add to dashboard Cite

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Isochronous mass measurements of Tz=−1fp -shell nuclei from projectile fragmentation of Ni58

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Gamow--Teller Excitations Studied by Weak and Strong Interactions

Cited by 5 publications

References 20 publications

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in Xu1, Zhang2, Peng3 et al. 2016Phys. Rev. Lett.38070View full textAdd to dashboardCite

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in Xu1, Zhang2, Peng3 et al. 2016Phys. Rev. Lett.38070View full textAdd to dashboardCite

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Isochronous mass measurements of Tz=−1fp -shell nuclei from projectile fragmentation of Ni58

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Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
0
7
0
View full text Add to dashboard Cite

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
38
0
7
0
View full text Add to dashboard Cite