α-decay spectroscopy of the N=130 isotones 218Ra and 220Th: Mitigation of α-particle energy summing with implanted nuclei

被引：7

作者：

Parr, E. ^{[1
,2
,4
]}

Smith, J. F. ^{[1
,2
]}

Greenlees, P. T. ^{[3
]}

Auranen, K. ^{[3
]}

Butler, P. A. ^{[4
]}

Chapman, R. ^{[1
,2
]}

Cox, D. M. ^{[3
]}

Cullen, D. M. ^{[5
]}

Gaffney, L. P. ^{[1
,2
,4
]}

Grahn, T. ^{[3
]}

Gregor, E. T. ^{[1
,2
]}

Grocutt, L. ^{[1
,2
]}

Herzan, A. ^{[3
,8
]}

Herzberg, R-D ^{[4
]}

Hodge, D. ^{[5
]}

Jakobsson, U. ^{[3
]}

Julin, R. ^{[3
]}

Asztalos, S. ^{[3
]}

Keatings, J. ^{[1
,2
]}

Konki, J. ^{[3
,9
]}

Leino, M. ^{[3
]}

McKee, P. P. ^{[1
,2
]}

McPeake, C. ^{[4
]}

Mengoni, D. ^{[6
,7
]}

Mistry, A. K. ^{[4
]}

Mulholland, K. F. ^{[1
,2
]}

Singh, B. S. Nara ^{[1
,5
]}

O'Neill, G. G. ^{[4
]}

Pakarinen, J. ^{[3
]}

Papadakis, P. ^{[3
,10
]}

Partanen, J. ^{[3
]}

Peura, P. ^{[3
]}

Rahkila, P. ^{[3
]}

Ruotsalainen, P. ^{[3
]}

Sandzelius, M. ^{[3
]}

Saren, J. ^{[3
]}

Scheck, M. ^{[1
,2
]}

Scholey, C. ^{[3
]}

Siciliano, M. ^{[3
,11
]}

Smolen, M. ^{[1
,2
]}

Sorri, J. ^{[3
,12
]}

Spagnoletti, P. ^{[1
,2
]}

Spohr, K. M. ^{[1
,2
]}

Stolze, S. ^{[3
,13
]}

Taylor, M. J. ^{[5
,14
]}

Uusitalo, J. ^{[3
]}

机构：

[1] Univ West Scotland, Sch Comp Engn & Phys Sci, Paisley PA1 2BE, Renfrew, Scotland

[2] SUPA, Scottish Univ Phys Alliance, Glasgow G12 8QQ, Lanark, Scotland

[3] Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland

[4] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England

[5] Univ Manchester, Sch Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England

[6] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[7] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[8] Slovak Acad Sci, Inst Phys, SK-84511 Bratislava, Slovakia

[9] CERN, CH-1211 Geneva 23, Switzerland

[10] STFC Daresbury Lab, Nucl Phys Grp, Warrington WA4 4AD, Cheshire, England

[11] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[12] Univ Oulu, Sodankyla Geophys Observ, Sodankyla, Finland

[13] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[14] Univ Manchester, Sch Med Sci, Div Canc Sci, Manchester M13 9PL, Lancs, England

来源：

PHYSICAL REVIEW C | 2019年 / 100卷 / 04期

基金：

欧盟第七框架计划; 芬兰科学院;

关键词：

INTRINSIC REFLECTION ASYMMETRY; GAMMA-RAY SPECTROSCOPY; ISOTOPES; IDENTIFICATION; EMITTERS; THORIUM; PA-221; STATE;

D O I：

10.1103/PhysRevC.100.044323

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：

An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived alpha decays from nuclei implanted into a silicon detector. Using this technique, alpha-decay spectroscopy of the N = 130 isotones Ra-218 (Z = 88) and Th-220 (Z = 90) has been performed. The energies of the alpha particles emitted in the Ra-218 -> Rn-214 and Th-220 -> Ra-216 ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of Ra-218 and Th-220 have been measured to be 25.99(10) mu s and 10.4(4) mu s, respectively. The half-lives of the ground states of the alpha-decay daughters, Rn-214 and Ra-216, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the alpha decay of Ra-218 has been observed for the first time, populating the 695-keV 2(1)(+) state in Rn-214. The fine-structure a decay has an alpha-particle energy of 7715(40) keV and branching ratio b(alpha) = 0.123(11)%.

引用

页数：9