Searching for 0+ states in 50Cr: Implications for the superallowed β decay of 50Mn

被引：8

作者：

Leach, K. G. ^{[1
,2
]}

Garrett, P. E. ^{[3
]}

Ball, G. C. ^{[2
]}

Bender, P. C. ^{[2
,4
]}

Bildstein, V. ^{[3
]}

Brown, B. A. ^{[4
,5
]}

Burbadge, C. ^{[3
]}

Faestermann, T. ^{[6
]}

Hadinia, B. ^{[3
]}

Holt, J. D. ^{[2
]}

Laffoley, A. T. ^{[3
,9
]}

Jamieson, D. S. ^{[3
,10
]}

Jigmeddorj, B. ^{[3
]}

Radich, A. J. ^{[3
]}

Rand, E. T. ^{[3
,11
]}

Stroberg, S. R. ^{[2
]}

Svensson, C. E. ^{[3
]}

Towner, I. S. ^{[7
]}

Wirth, H. -F. ^{[8
]}

机构：

[1] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA

[2] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[3] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

[4] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[5] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[6] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[7] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[8] Univ Munich, Fak Phys, D-85748 Garching, Germany

[9] CEA DSM CNRS IN2P3, GANIL, Blvd Henri Becquerel, F-14076 Caen, France

[10] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[11] AECL Chalk River Labs, 286 Plant Rd Stn 508A, Chalk River, ON K0J 1J0, Canada

来源：

PHYSICAL REVIEW C | 2016年 / 94卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

ISOSPIN-MIXING CORRECTIONS; NUCLEAR SPECTROSCOPY;

D O I：

10.1103/PhysRevC.94.011304

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A Cr-52(p, t)Cr-50 two-neutron pickup reaction was performed using the Q3D magnetic spectrograph at the Maier-Leibnitz-Laboratorium in Garching, Germany. Excited states in Cr-50 were observed up to an excitation energy of 5.3 MeV. Despite significantly increased sensitivity and resolution over previous work, no evidence of the previously assigned first excited 0(+) state was found. As a result, the 0(2)(+) state is reassigned at an excitation energy of E-x = 3895.0(5) keV in Cr-50. This reassignment directly impacts direct searches for a nonanalog Fermi beta(+) decay branch in Mn-50. These results also show better systematic agreement with the theoretical predictions for the 0(+) state spectrum in Cr-50 using the same formalism as the isospin-symmetry-breaking correction calculations for superallowed nuclei. The experimental data are also compared to ab-initio shell-model predictions using the IM-SRG formalism based on NN and 3N forces from chiral-EFT in the pf-shell for the first time.

引用

页数：7

共 26 条

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