First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in ^{213}Tl and ^{215}Tl

Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in ^{213}Tl and 874(5) keV...

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Veröffentlicht in:Physical review letters 2024-08, Vol.133 (7), p.072501
Hauptverfasser: Yeung, T T, Morales, A I, Wu, J, Liu, M, Yuan, C, Nishimura, S, Phong, V H, Fukuda, N, Tain, J L, Davinson, T, Rykaczewski, K P, Yokoyama, R, Isobe, T, Niikura, M, Podolyák, Zs, Alcalá, G, Algora, A, Allmond, J M, Agramunt, J, Appleton, C, Baba, H, Caballero-Folch, R, Calvino, F, Carpenter, M P, Dillmann, I, Estrade, A, Gao, T, Griffin, C J, Grzywacz, R K, Hall, O, Hirayama, Y, Hue, B M, Ideguchi, E, Kiss, G G, Kokubun, K, Kondev, F G, Mizuno, R, Mukai, M, Nepal, N, Nurhafiza, M N, Ohta, S, Orrigo, S E A, Pallàs, M, Park, J, Rasco, B C, Rodríguez-García, D, Sakurai, H, Sexton, L, Shimizu, Y, Suzuki, H, Vitéz-Sveiczer, A, Takeda, H, Tarifeno-Saldivia, A, Tolosa-Delgado, A, Victoria, J A, Watanabe, Y X, Yap, J M
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container_issue 7
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container_title Physical review letters
container_volume 133
creator Yeung, T T
Morales, A I
Wu, J
Liu, M
Yuan, C
Nishimura, S
Phong, V H
Fukuda, N
Tain, J L
Davinson, T
Rykaczewski, K P
Yokoyama, R
Isobe, T
Niikura, M
Podolyák, Zs
Alcalá, G
Algora, A
Allmond, J M
Agramunt, J
Appleton, C
Baba, H
Caballero-Folch, R
Calvino, F
Carpenter, M P
Dillmann, I
Estrade, A
Gao, T
Griffin, C J
Grzywacz, R K
Hall, O
Hirayama, Y
Hue, B M
Ideguchi, E
Kiss, G G
Kokubun, K
Kondev, F G
Mizuno, R
Mukai, M
Nepal, N
Nurhafiza, M N
Ohta, S
Orrigo, S E A
Pallàs, M
Park, J
Rasco, B C
Rodríguez-García, D
Sakurai, H
Sexton, L
Shimizu, Y
Suzuki, H
Vitéz-Sveiczer, A
Takeda, H
Tarifeno-Saldivia, A
Tolosa-Delgado, A
Victoria, J A
Watanabe, Y X
Yap, J M
description Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in ^{213}Tl and 874(5) keV in ^{215}Tl. The measured half-lives of 1.34(5) ms in ^{213}Tl and 3.0(3) ms in ^{215}Tl suggest spins and parities 11/2^{-} with the single proton-hole configuration πh_{11/2} as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2^{+}, interpreted as arising from a single πs_{1/2} proton hole coupled to the 8^{+} seniority isomer in the ^{A+1}Pb cores. The lowering of the 11/2^{-} states is ascribed to an increase of the πh_{11/2} proton effective single-particle energy as the second νg_{9/2} orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh_{11/2} and νg_{9/2} orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic ^{208}Pb.
doi_str_mv 10.1103/PhysRevLett.133.072501
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New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in ^{213}Tl and 874(5) keV in ^{215}Tl. The measured half-lives of 1.34(5) ms in ^{213}Tl and 3.0(3) ms in ^{215}Tl suggest spins and parities 11/2^{-} with the single proton-hole configuration πh_{11/2} as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2^{+}, interpreted as arising from a single πs_{1/2} proton hole coupled to the 8^{+} seniority isomer in the ^{A+1}Pb cores. The lowering of the 11/2^{-} states is ascribed to an increase of the πh_{11/2} proton effective single-particle energy as the second νg_{9/2} orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh_{11/2} and νg_{9/2} orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N&gt;126 nuclear region below doubly magic ^{208}Pb.</description><issn>1079-7114</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNpNkE9Lw0AQxRdRrFa_Qtmjl9T9l00jeJDaaqGtoj0bkuyUrmyycTeJFvHmBzdqBU8zb-bHe8MgNKBkSCnh5_ebrX-Adg51PaScD0nEQkL30BElURxElIr9f30PHXv_TAihTI4OUY_HjPIwlEfoc6qdr_HkrTLWpbW2JbZrvLClrayB4NrpFkr8uAFj8KS1pvlB0sy2gOsN4OVlZ7nbj431jYMLvIRXvNDGaA-5LRWeeVuA81iX-Om9S_5YGZx2828RduIEHaxT4-F0V_toNZ2sxrfB_O5mNr6aB1UoZQBEZmnKBGcshDiMeKyEFJDRXBBQghMBKhsJGcmcRlyqSGZ5xwku1ypWnPE-Ovu1rZx9acDXSaF93l2elmAbn3ASxyMimOQdOtihTVaASiqni9Rtk7_H8S9qOnH0</recordid><startdate>20240816</startdate><enddate>20240816</enddate><creator>Yeung, T T</creator><creator>Morales, A I</creator><creator>Wu, J</creator><creator>Liu, M</creator><creator>Yuan, C</creator><creator>Nishimura, 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M</au><au>Agramunt, J</au><au>Appleton, C</au><au>Baba, H</au><au>Caballero-Folch, R</au><au>Calvino, F</au><au>Carpenter, M P</au><au>Dillmann, I</au><au>Estrade, A</au><au>Gao, T</au><au>Griffin, C J</au><au>Grzywacz, R K</au><au>Hall, O</au><au>Hirayama, Y</au><au>Hue, B M</au><au>Ideguchi, E</au><au>Kiss, G G</au><au>Kokubun, K</au><au>Kondev, F G</au><au>Mizuno, R</au><au>Mukai, M</au><au>Nepal, N</au><au>Nurhafiza, M N</au><au>Ohta, S</au><au>Orrigo, S E A</au><au>Pallàs, M</au><au>Park, J</au><au>Rasco, B C</au><au>Rodríguez-García, D</au><au>Sakurai, H</au><au>Sexton, L</au><au>Shimizu, Y</au><au>Suzuki, H</au><au>Vitéz-Sveiczer, A</au><au>Takeda, H</au><au>Tarifeno-Saldivia, A</au><au>Tolosa-Delgado, A</au><au>Victoria, J A</au><au>Watanabe, Y X</au><au>Yap, J M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in ^{213}Tl and ^{215}Tl</atitle><jtitle>Physical review letters</jtitle><addtitle>Phys Rev Lett</addtitle><date>2024-08-16</date><risdate>2024</risdate><volume>133</volume><issue>7</issue><spage>072501</spage><pages>072501-</pages><issn>1079-7114</issn><eissn>1079-7114</eissn><abstract>Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in ^{213}Tl and 874(5) keV in ^{215}Tl. The measured half-lives of 1.34(5) ms in ^{213}Tl and 3.0(3) ms in ^{215}Tl suggest spins and parities 11/2^{-} with the single proton-hole configuration πh_{11/2} as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2^{+}, interpreted as arising from a single πs_{1/2} proton hole coupled to the 8^{+} seniority isomer in the ^{A+1}Pb cores. The lowering of the 11/2^{-} states is ascribed to an increase of the πh_{11/2} proton effective single-particle energy as the second νg_{9/2} orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh_{11/2} and νg_{9/2} orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N&gt;126 nuclear region below doubly magic ^{208}Pb.</abstract><cop>United States</cop><pmid>39213556</pmid><doi>10.1103/PhysRevLett.133.072501</doi></addata></record>
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title First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in ^{213}Tl and ^{215}Tl
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