Identification of the crossing point at N=21 between normal and intruder configurations

Lica R.; Rotaru F.; Borge M. J. G.; Grevy S.; Negoita F.; Poves A.; Sorlin O.; Andreyev A. N.; Borcea R.; Costache C.; De Witte H.; Fraile L. M.; Greenlees P. T.; Huyse M.; Ionescu A.; Kisyov S.; Konki J.; Lazarus I.; Madurga M.; Marginean N.; Marginean R.; Mihai C.; Mihai R. E.; Negret A.; Page R. D.; Pakarinen J.; Pascu S.; Pucknell V.; Rahkila P.; Rapisarda E.; Serban A.; Sotty C. O.; Stan L.; Stanoiu M.; Tengblad O.; Turturica A.; Van Duppen P.; Wadsworth R.; Warr N.

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Identification of the crossing point at N=21 between normal and intruder configurations

机译：在正常和入侵配置之间识别n = 21的交叉点

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The beta(-) decay of Mg-34 was used to study the Al-34 nucleus through. spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two beta-decaying states in Al-34 having spin-parity assignments J(pi) = 4(-) dominated by the normal configuration pi(d(5/2))(-1)circle times nu(f(7/2)) and J(pi) = 1(+) by the intruder configuration pi(d(5/2))(-1) circle times nu(d(3/2))(-1) (f(7/2))(2). Their unknown ordering and relative energy have been the subject of debate for the placement of Al-34 inside or outside the N = 20 "island of inversion." We report here that the 1(+) intruder lies only 46.6 keV above the 4(-) ground state. In addition, a new half-life of T-1/2 = 44.9(4) ms, that is twice as long as the previously measured 20(10) ms, has been determined for Mg-34. Large-scale shell-model calculations with the recently developed SDPF-U-MIX interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the N = 20 island of inversion.

机译：利用Mg-34的β（-）衰变对Al-34核进行了深入研究。CERN同位素分离器在线设备的光谱学。之前的研究发现，Al-34中有两种β衰变状态，它们的自旋奇偶分配J（pi）=4（-）主要由正常组态pi（d（5/2））（-1）圈乘以nu（f（7/2））控制，而J（pi）=1（+）由入侵者组态pi（d（5/2））（-1）圈乘以nu（d（3/2））（-1）（f（7/2））（2）。对于Al-34在N=20“反转岛”内部或外部的位置，它们的未知顺序和相对能量一直是争论的主题我们在此报告，1（+）入侵者仅位于4（-）基态上方46.6keV。此外，Mg-34的新半衰期T-1/2=44.9（4）ms，是之前测量的20（10）ms的两倍。将最近开发的SDPF-U-MIX相互作用的大规模壳模型计算结果与新数据进行比较，并用于解释N=20反演岛边界处的作用机制。

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《Physical review, C》 |2017年第2期|共6页
作者
Lica R.; Rotaru F.; Borge M. J. G.; Grevy S.; Negoita F.; Poves A.; Sorlin O.; Andreyev A. N.; Borcea R.; Costache C.; De Witte H.; Fraile L. M.; Greenlees P. T.; Huyse M.; Ionescu A.; Kisyov S.; Konki J.; Lazarus I.; Madurga M.; Marginean N.; Marginean R.; Mihai C.; Mihai R. E.; Negret A.; Page R. D.; Pakarinen J.; Pascu S.; Pucknell V.; Rahkila P.; Rapisarda E.; Serban A.; Sotty C. O.; Stan L.; Stanoiu M.; Tengblad O.; Turturica A.; Van Duppen P.; Wadsworth R.; Warr N.;
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作者单位

CERN CH-1211 Geneva 23 Switzerland;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

CERN CH-1211 Geneva 23 Switzerland;

CNRS IN2P3 CEA DRF GANIL Bvd Henri Becquerel F-14076 Caen France;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Univ Autonoma Madrid Dept Fis Teor E-28049 Madrid Spain;

CNRS IN2P3 CEA DRF GANIL Bvd Henri Becquerel F-14076 Caen France;

Univ York Dept Phys York YO10 5DD N Yorkshire England;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Katholieke Univ Leuven Inst Kern &

Stralingsfys Celestijnenlaan 200D B-3001 Heverlee Belgium;

Univ Complutense Fac CC Fis Grp Fis Nucl CEI Moncloa E-28040 Madrid Spain;

Univ Jyvaskyla Dept Phys POB 35 FI-40014 Jyvaskyla Finland;

Katholieke Univ Leuven Inst Kern &

Stralingsfys Celestijnenlaan 200D B-3001 Heverlee Belgium;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Univ Jyvaskyla Dept Phys POB 35 FI-40014 Jyvaskyla Finland;

CERN CH-1211 Geneva 23 Switzerland;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Univ Liverpool Dept Phys Oliver Lodge Lab Liverpool L69 7ZE Merseyside England;

Univ Jyvaskyla Dept Phys POB 35 FI-40014 Jyvaskyla Finland;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

STFC Daresbury Warrington WA4 4AD Cheshire England;

Univ Jyvaskyla Dept Phys POB 35 FI-40014 Jyvaskyla Finland;

CERN CH-1211 Geneva 23 Switzerland;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

CSIC Inst Estruct Mat Serrano 113 Bis E-28006 Madrid Spain;

Horia Hulubei Natl Inst Phys &

Nucl Engn RO-077125 Bucharest Romania;

Katholieke Univ Leuven Inst Kern &

Stralingsfys Celestijnenlaan 200D B-3001 Heverlee Belgium;

Univ York Dept Phys York YO10 5DD N Yorkshire England;

Univ Cologne Inst Kernphys Zulpicher Str 77 D-50937 Cologne Germany;

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中图分类原子核物理学、高能物理学;
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Identification of the crossing point at N=21 between normal and intruder configurations

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