Two-proton emission in the decay of 31Ar

被引：31

作者：

Axelsson, L ^{[1
]}

Aysto, J

Bergmann, UC

Borge, MJG

Fraile, LM

Fynbo, HOU

Honkanen, A

Hornshoj, P

Jokinen, A

Jonson, B

Martel, I

Mukha, I

Nilsson, T

Nyman, G

Petersen, B

Riisager, K

Smedberg, MH

Tengblad, O

机构：

[1] Chalmers Tekn Hogskola, Inst Fys, S-41296 Gothenburg, Sweden

[2] Univ Jyvaskyla, Dept Phys, FIN-40351 Jyvaskyla, Finland

[3] CERN, Div PPE, CH-1211 Geneva, Switzerland

[4] Aarhus Univ, Inst Fys Astron, DK-8000 Aarhus C, Denmark

[5] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

[6] IV Kurchatov Atom Energy Inst, Moscow 123182, Russia

来源：

NUCLEAR PHYSICS A | 1998年 / 628卷 / 03期

关键词：

radioactivity Ar-31(beta(+)p) [from Ca(p; 3pxn); reaction; measured beta-delayed E-p; pp-coin; Ar-31 deduced beta 2p-decay channels; CaO target; surface barrier Si detectors; on-line mass separation;

D O I：

10.1016/S0375-9474(97)00623-4

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：

Several beta-delayed two-proton branches were observed in the decay of Ar-31, the most intense ones proceeding through the isobaric analogue state (IAS) in Cl-31. The mechanism of the two-proton emission is studied via the energy and angular distributions of the two protons, Simultaneous emission of the two protons fits the present data well, sequential decays might also describe them. Independent of the decay mechanism, a spin of 5/2 for the IAS is suggested, An improved limit on the direct two-proton emission fi om the ground state of Ar-31 is presented, (C) 1998 Elsevier Science B.V.

引用

页码：345 / 362

页数：18

共 40 条

[1] ISOBARIC MASS EQUATION FOR A = 1-45 AND SYSTEMATICS OF COULOMB DISPLACEMENT ENERGIES [J].

ANTONY, MS ;

BRITZ, J ;

BUEB, JB ;

PAPE, A .

ATOMIC DATA AND NUCLEAR DATA TABLES, 1985, 33 (03) :447-478

[2] ISOBARIC MASS SYSTEMATICS FOR A-LESS-THAN-OR-EQUAL-TO-60 [J].

ANTONY, MS ;

PAPE, A .

PHYSICAL REVIEW C, 1984, 30 (04) :1286-1292

[3] The 1995 update to the atomic mass evaluation [J].

Audi, G ;

Wapstra, AH .

NUCLEAR PHYSICS A, 1995, 595 (04) :409-480

[4]

AXELSSON L, UNPUB NUCL PHYS A

[5] OBSERVATION OF THE 1ST TZ=-5/2 NUCLIDE, CA-35, VIA ITS BETA-DELAYED 2-PROTON EMISSION [J].

AYSTO, J ;

MOLTZ, DM ;

XU, XJ ;

REIFF, JE ;

CERNY, J .

PHYSICAL REVIEW LETTERS, 1985, 55 (13) :1384-1387

[6] CONSTRAINTS ON THE LOW-ENERGY E1 CROSS-SECTION OF C-12(ALPHA,GAMMA-O-16 FROM THE BETA-DELAYED ALPHA-SPECTRUM OF N-16 [J].

AZUMA, RE ;

BUCHMANN, L ;

BARKER, FC ;

BARNES, CA ;

DAURIA, JM ;

DOMBSKY, M ;

GIESEN, U ;

JACKSON, KP ;

KING, JD ;

KORTELING, RG ;

MCNEELY, P ;

POWELL, J ;

ROY, G ;

VINCENT, J ;

WANG, TR ;

WONG, SSM ;

WREAN, PR .

PHYSICAL REVIEW C, 1994, 50 (02) :1194-1215

[7]

BAIN CR, 1996, PHYS LETT B, V373, P55

[8] CLARIFICATION OF THE USE OF CHI-SQUARE AND LIKELIHOOD FUNCTIONS IN FITS TO HISTOGRAMS [J].

BAKER, S ;

COUSINS, RD .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1984, 221 (02) :437-442

[9] DECAY MODES OF AR-31 AND 1ST OBSERVATION OF BETA-DELAYED 3-PROTON RADIOACTIVITY [J].

BAZIN, D ;

DELMORAL, R ;

DUFOUR, JP ;

FLEURY, A ;

HUBERT, F ;

PRAVIKOFF, MS ;

ANNE, R ;

BRICAULT, P ;

DETRAZ, C ;

LEWITOWICZ, M ;

ZHENG, Y ;

GUILLEMAUDMUELLER, D ;

JACMART, JC ;

MUELLER, AC ;

POUGHEON, F ;

RICHARD, A .

PHYSICAL REVIEW C, 1992, 45 (01) :69-79

[10] THEORY OF ANGULAR CORRELATION OF NUCLEAR RADIATIONS [J].

BIEDENHARN, LC ;

ROSE, ME .

REVIEWS OF MODERN PHYSICS, 1953, 25 (03) :729-777

← 1 2 3 4 →