New information on β-delayed neutron emission from 12,14Be

被引：28

作者：

Bergmann, UC ^{[1
]}

Axelsson, L

Borge, MJG

Fedoseyev, VN

Forssén, C

Fynbo, HOU

Grévy, S

Hornshoj, P

Jading, Y

Jonson, B

Köster, U

Markenroth, K

Marqués, FM

Mishin, VI

Nilsson, T

Nyman, G

Oberstedt, A

Ravn, HL

Riisager, K

Schrieder, G

Sebastian, V

Simon, H

Tengblad, O

Wenander, F

Rolander, KW

机构：

[1] Aarhus Univ, Inst Fysik & Astronomi, DK-8000 Aarhus C, Denmark

[2] Chalmers Tekn Hogskola, S-41296 Gothenburg, Sweden

[3] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[4] Russian Acad Sci, Inst Spect, RUS-142092 Troitsk, Russia

[5] Inst Sci Mat & Rayonnement, CNRS, CNRS, IN2P3,Lab Phys Corpusculaire, F-14050 Caen, France

[6] Univ Caen, F-14050 Caen, France

[7] CERN, Div EP, CH-1211 Geneva 23, Switzerland

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

[9] Univ Orebro, Inst Teknik & Naturvetenskap, S-70182 Orebro, Sweden

[10] TH Darmstadt, Inst Phys, D-64289 Darmstadt, Germany

[11] Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[12] Univ Stockholm, Inst Fys, S-11385 Stockholm, Sweden

来源：

NUCLEAR PHYSICS A | 1999年 / 658卷 / 02期

关键词：

RADIOACTIVITY Be-12; Be-14 (from 1 GeV p on UC target; selective mass separation); measured beta n; nn time correlations; Be-12; Be-14 deduced P-n values; Be-14 deduced P-xn; values; neutron long counters;

D O I：

10.1016/S0375-9474(99)00348-6

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：

The beta-delayed neutron branches from neutron-rich Be-isotopes have been measured with a setup sensitive down to thermal energies. For Be-14 a new value of P-n = 101 +/- 4% has been found for the total neutron-emission probability and an upper limit of 2.4% (95% confidence level) is imposed on the combination P-2n + 3P(3n) of multi-neutron emission probabilities. Moreover, an improved value of P-n = 0.50 +/- 0.03% has been obtained for Be-12. A time-correlation method, previously developed for a continuous radioactive beam to determine neutron branching ratios, has been revised and adapted to the pulsed secondary beam at ISOLDE, CERN. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：129 / 145

页数：17

共 23 条

[1] ENERGY-LEVELS OF LIGHT-NUCLEI A=13-15 [J].

AJZENBERGSELOVE, F .

NUCLEAR PHYSICS A, 1991, 523 (01) :1-196

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

Audi, G ;

Wapstra, AH .

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

[3] The NUBASE evaluation of nuclear and decay properties [J].

Audi, G ;

Bersillon, O ;

Blachot, J ;

Wapstra, AH .

NUCLEAR PHYSICS A, 1997, 624 (01) :1-124

[4] BETA-DELAYED 3-NEUTRON RADIOACTIVITY OF LI-11 - THE ISOLDE COLLABORATION [J].

AZUMA, RE ;

BJORNSTAD, T ;

GUSTAFSSON, HA ;

HANSEN, PG ;

JONSON, B ;

MATTSSON, S ;

NYMAN, G ;

POSKANZER, AM ;

RAVN, HL .

PHYSICS LETTERS B, 1980, 96 (1-2) :31-34

[5] 1ST OBSERVATION OF BETA-DELAYED 2-NEUTRON RADIOACTIVITY - LI-11 [J].

AZUMA, RE ;

CARRAZ, LC ;

HANSEN, PG ;

JONSON, B ;

KRATZ, KL ;

MATTSSON, S ;

NYMAN, G ;

OHM, H ;

RAVN, HL ;

SCHRODER, A ;

ZIEGERT, W .

PHYSICAL REVIEW LETTERS, 1979, 43 (22) :1652-1654

[6] 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

[7] β decay of the neutron-rich isotope 14Be [J].

Belbot, M ;

Kolata, JJ ;

Zahar, M ;

Aoi, N ;

Hirai, M ;

Ishihara, M ;

Okuno, H ;

Sakurai, H ;

Teranishi, T ;

Kishida, T ;

Liu, G ;

Nakamura, T ;

Watanabe, Y ;

Yoshida, A ;

Ideguchi, E ;

Miyatake, H ;

Shimoura, S ;

Yamamoto, SS .

PHYSICAL REVIEW C, 1997, 56 (06) :3038-3044

[8] BETA-DELAYED NEUTRON DECAY OF BE-14 [J].

BELBOT, MD ;

KOLATA, JJ ;

LAMKIN, K ;

TIGHE, RJ ;

ZAHAR, M ;

HARKEWICZ, R ;

MORRISSEY, DJ ;

ORR, NA ;

RONNINGEN, RM ;

SHERRILL, BM ;

WINGER, JA ;

CARPENTER, M .

PHYSICAL REVIEW C, 1995, 51 (05) :2372-2380

[9] Elucidating halo structure by beta decay: beta gamma from the Li-11 decay [J].

Borge, MJG ;

Fynbo, H ;

GuillemaudMueller, D ;

Hornshoj, P ;

Humbert, F ;

Jonson, B ;

Leth, TE ;

MartinezPinedo, G ;

Nilsson, T ;

Nyman, G ;

Poves, A ;

RamosLerate, I ;

Riisager, K ;

Schrieder, G ;

Smedberg, M ;

Tengblad, O .

PHYSICAL REVIEW C, 1997, 55 (01) :R8-R11

[10] BETA-DELAYED MULTI-NEUTRON RADIOACTIVITY OF B-17,BE-14,C-19 [J].

DUFOUR, JP ;

DELMORAL, R ;

HUBERT, F ;

JEAN, D ;

PRAVIKOFF, MS ;

FLEURY, A ;

MUELLER, AC ;

SCHMIDT, KH ;

SUMMERER, K ;

HANELT, E ;

FREHAUT, J ;

BEAU, M ;

GIRAUDET, G .

PHYSICS LETTERS B, 1988, 206 (02) :195-198

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