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$^{57}$Zn $\beta$-delayed proton emission establishes the $^{56}$Ni $rp$-process waiting point bypass

dc.contributor.authorSAXENA, M.
dc.contributor.authorONG, W.-J
dc.contributor.authorMEISEL, Z.
dc.contributor.authorHOFF, D.E.M.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorSMIRNOVA, N.
dc.contributor.authorBENDER, P.C.
dc.contributor.authorBURCHER, S.P.
dc.contributor.authorCARPENTER, M.P.
dc.contributor.authorCARROLL, J.J.
dc.contributor.authorCHESTER, A.
dc.contributor.authorCHIARA, C.J.
dc.contributor.authorCONAWAY, R.
dc.contributor.authorCOPP, P.A.
dc.contributor.authorCRIDER, B.P.
dc.contributor.authorDERKIN, J.
dc.contributor.authorESTRADÉ, A.
dc.contributor.authorHAMAD, G.
dc.contributor.authorHARKE, J.T.
dc.contributor.authorJAIN, R.
dc.contributor.authorJAYATISSA, H.
dc.contributor.authorLIDDICK, S.N.
dc.contributor.authorLONGFELLOW, B.
dc.contributor.authorMOGANNAM, M.
dc.contributor.authorMONTES, F.
dc.contributor.authorNEPAL, N.
dc.contributor.authorOGUNBEKU, T.H.
dc.contributor.authorRICHARD, A.L.
dc.contributor.authorSCHATZ, H.
dc.contributor.authorSOLTESZ, D.
dc.contributor.authorSUBEDI, S.K.
dc.contributor.authorSULTANA, I.
dc.contributor.authorTAMASHIRO, A.S.
dc.contributor.authorTRIPATHI, V.
dc.contributor.authorXIAO, Y.
dc.contributor.authorZINK, R.
dc.date.accessioned2023-11-20T16:51:15Z
dc.date.available2023-11-20T16:51:15Z
dc.date.issued2022
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/185084
dc.description.abstractEn•In our letter, we address the dominant uncertainty regarding the extent of the rp-process flow bypass around <math altimg="si1.svg"><mmultiscripts><mrow><mi mathvariant="normal">Ni</mi></mrow><mprescripts/><none/><mrow><mn>56</mn></mrow></mmultiscripts></math> waiting point for astrophysical conditions relevant to Type-1 X-ray bursts.•We removed the final significant uncertainty, the beta-delayed proton branching ratio for <math altimg="si13.svg"><mmultiscripts><mrow><mi mathvariant="normal">Zn</mi></mrow><mprescripts/><none/><mrow><mn>57</mn></mrow></mmultiscripts></math>, definitively determining that there is a <math altimg="si1.svg"><mmultiscripts><mrow><mi mathvariant="normal">Ni</mi></mrow><mprescripts/><none/><mrow><mn>56</mn></mrow></mmultiscripts></math> bypass.•In addition, we also identified the second case of the exotic <math altimg="si3.svg"><mi>β</mi><mo linebreak="goodbreak" linebreakstyle="after">−</mo><mi>γ</mi><mo linebreak="goodbreak" linebreakstyle="after">−</mo><mi>p</mi></math> decay mode in the fp-shell. We measured the <math altimg="si13.svg"><mmultiscripts><mrow><mi mathvariant="normal">Zn</mi></mrow><mprescripts/><none/><mrow><mn>57</mn></mrow></mmultiscripts></math>β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a <math altimg="si13.svg"><mmultiscripts><mrow><mi mathvariant="normal">Zn</mi></mrow><mprescripts/><none/><mrow><mn>57</mn></mrow></mmultiscripts></math> half-life of <math altimg="si4.svg"><mn>43.6</mn><mo>±</mo><mn>0.2</mn></math> ms, βp branching ratio of <math altimg="si5.svg"><mo stretchy="false">(</mo><mn>84.7</mn><mo>±</mo><mn>1.4</mn><mo stretchy="false">)</mo><mtext>%</mtext></math>, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the <math altimg="si13.svg"><mmultiscripts><mrow><mi mathvariant="normal">Zn</mi></mrow><mprescripts/><none/><mrow><mn>57</mn></mrow></mmultiscripts></math> mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point <math altimg="si1.svg"><mmultiscripts><mrow><mi mathvariant="normal">Ni</mi></mrow><mprescripts/><none/><mrow><mn>56</mn></mrow></mmultiscripts></math> for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the <math altimg="si1.svg"><mmultiscripts><mrow><mi mathvariant="normal">Ni</mi></mrow><mprescripts/><none/><mrow><mn>56</mn></mrow></mmultiscripts></math> bypass, with 14-17% of the rp-process flow taking this route.
dc.language.isoen
dc.subject.enType-1 X-ray bursts
dc.subject.enWaiting-point
dc.subject.en-decay measurement of proton rich isotope
dc.subject.enType-1 X-ray bursts
dc.title.en$^{57}$Zn $\beta$-delayed proton emission establishes the $^{56}$Ni $rp$-process waiting point bypass
dc.typeArticle de revue
dc.identifier.doi10.1016/j.physletb.2022.137059
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.subject.halPhysique [physics]/Physique Nucléaire Théorique [nucl-th]
dc.identifier.arxiv2204.01621
bordeaux.journalPhys.Lett.B
bordeaux.page137059
bordeaux.volume829
bordeaux.hal.laboratoriesCentre d'Études Nucléaires de Bordeaux Gradignan (CENBG)*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-03644556
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03644556v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Phys.Lett.B&amp;rft.date=2022&amp;rft.volume=829&amp;rft.spage=137059&amp;rft.epage=137059&amp;rft.au=SAXENA,%20M.&amp;ONG,%20W.-J&amp;MEISEL,%20Z.&amp;HOFF,%20D.E.M.&amp;SMIRNOVA,%20N.&amp;rft.genre=article


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