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Article: Large Isospin Asymmetry in 22Si/22O Mirror Gamow-Teller Transitions Reveals the Halo Structure of 22Al

TitleLarge Isospin Asymmetry in 22Si/22O Mirror Gamow-Teller Transitions Reveals the Halo Structure of 22Al
Authors
Issue Date2020
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/
Citation
Physical Review Letters, 2020, v. 125 n. 19, p. article no. 192503 How to Cite?
Abstractbeta-delayed one-proton emissions of Si-22, the lightest nucleus with an isospin projection T-z = -3, are studied with a silicon array surrounded by high-purity germanium detectors. Properties of beta-decay branches and the reduced transition probabilities for the transitions to the low-lying states of Al-22 are determined. Compared to the mirror beta decay of O-22, the largest value of mirror asymmetry in low-lying states by far, with delta = 209(96), is found in the transition to the first 1(+) excited state. Shell-model calculation with isospin-nonconserving forces, including the T = 1, J = 2, 3 interaction related to the s(1/2) orbit that introduces explicitly the isospin-symmetry breaking force and describes the loosely bound nature of the wave functions of the s(1/2) orbit, can reproduce the observed data well and consistently explain the observation that a large delta value occurs for the first but not for the second 1(+) excited state of Al-22. Our results, while supporting the proton-halo structure in Al-22, might provide another means to identify halo nuclei.
DescriptionRIBLL Collaboration
Persistent Identifierhttp://hdl.handle.net/10722/294130
ISSN
2019 Impact Factor: 8.385
2015 SCImago Journal Rankings: 3.731
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLee, J-
dc.contributor.authorXu, XX-
dc.contributor.authorKaneko, K-
dc.contributor.authorSun, Y-
dc.contributor.authorLin, CJ-
dc.contributor.authorSun, LJ-
dc.contributor.authorLIANG, PF-
dc.contributor.authorLi, ZH-
dc.contributor.authorLi, J-
dc.contributor.authorWu, HY-
dc.contributor.authorFang, DQ-
dc.contributor.authorWang, JS-
dc.contributor.authorYang, YY-
dc.contributor.authorYuan, CX-
dc.contributor.authorLam, YH-
dc.contributor.authorWang, YT-
dc.contributor.authorWang, K-
dc.contributor.authorWang, JG-
dc.contributor.authorMa, JB-
dc.contributor.authorLiu, JJ-
dc.contributor.authorLi, PJ-
dc.contributor.authorZhao, QQ-
dc.contributor.authorYang, L-
dc.contributor.authorMa, NR-
dc.contributor.authorWang, DX-
dc.contributor.authorZhong, FP-
dc.contributor.authorZhong, SH-
dc.contributor.authorYang, F-
dc.contributor.authorJia, HM-
dc.contributor.authorWen, PW-
dc.contributor.authorPan, M-
dc.contributor.authorZang, HL-
dc.contributor.authorWang, X-
dc.contributor.authorWu, CG-
dc.contributor.authorLuo, DW-
dc.contributor.authorWang, HW-
dc.contributor.authorLi, C-
dc.contributor.authorShi, CZ-
dc.contributor.authorNie, MW-
dc.contributor.authorLi, XF-
dc.contributor.authorLi, H-
dc.contributor.authorMa, P-
dc.contributor.authorHu, Q-
dc.contributor.authorShi, GZ-
dc.contributor.authorJin, SL-
dc.contributor.authorHuang, MR-
dc.contributor.authorBai, Z-
dc.contributor.authorZhou, YJ-
dc.contributor.authorMa, WH-
dc.contributor.authorDuan, FF-
dc.contributor.authorJin, SY-
dc.contributor.authorGao, QR-
dc.contributor.authorZhou, XH-
dc.contributor.authorHu, ZG-
dc.contributor.authorWang, M-
dc.contributor.authorLiu, ML-
dc.contributor.authorChen, RF-
dc.contributor.authorMa, XW-
dc.date.accessioned2020-11-23T08:26:45Z-
dc.date.available2020-11-23T08:26:45Z-
dc.date.issued2020-
dc.identifier.citationPhysical Review Letters, 2020, v. 125 n. 19, p. article no. 192503-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/294130-
dc.descriptionRIBLL Collaboration-
dc.description.abstractbeta-delayed one-proton emissions of Si-22, the lightest nucleus with an isospin projection T-z = -3, are studied with a silicon array surrounded by high-purity germanium detectors. Properties of beta-decay branches and the reduced transition probabilities for the transitions to the low-lying states of Al-22 are determined. Compared to the mirror beta decay of O-22, the largest value of mirror asymmetry in low-lying states by far, with delta = 209(96), is found in the transition to the first 1(+) excited state. Shell-model calculation with isospin-nonconserving forces, including the T = 1, J = 2, 3 interaction related to the s(1/2) orbit that introduces explicitly the isospin-symmetry breaking force and describes the loosely bound nature of the wave functions of the s(1/2) orbit, can reproduce the observed data well and consistently explain the observation that a large delta value occurs for the first but not for the second 1(+) excited state of Al-22. Our results, while supporting the proton-halo structure in Al-22, might provide another means to identify halo nuclei.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCopyright [2020] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.125.192503].-
dc.titleLarge Isospin Asymmetry in 22Si/22O Mirror Gamow-Teller Transitions Reveals the Halo Structure of 22Al-
dc.typeArticle-
dc.identifier.emailLee, J: jleehc@hku.hk-
dc.identifier.emailLi, PJ: lipj1110@HKUCC-COM.hku.hk-
dc.identifier.authorityLee, J=rp01902-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.125.192503-
dc.identifier.pmid33216609-
dc.identifier.hkuros320211-
dc.identifier.volume125-
dc.identifier.issue19-
dc.identifier.spagearticle no. 192503-
dc.identifier.epagearticle no. 192503-
dc.identifier.isiWOS:000585709000004-
dc.publisher.placeUnited States-

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