Invariant-mass spectroscopy of Li-10 and Li-11

被引：259

作者：

Zinser, M

Humbert, F

Nilsson, T

Schwab, W

Simon, H

Aumann, T

Borge, MJG

Chulkov, LV

Cub, J

Elze, TW

Emling, H

Geissel, H

GuillemaudMueller, D

Hansen, PG

Holzmann, R

Irnich, H

Jonson, B

Kratz, JV

Kulessa, R

Leifels, Y

Lenske, H

Magel, A

Mueller, AC

Munzenberg, G

Nickel, F

Nyman, G

Richter, A

Riisager, K

Scheidenberger, C

Schrieder, G

Stelzer, K

Stroth, J

Surowiec, A

Tengblad, O

Wajda, E

Zude, E

机构：

[1] TH DARMSTADT,INST KERNPHYS,D-64289 DARMSTADT,GERMANY

[2] CHALMERS UNIV TECHNOL,INST FYS,S-41296 GOTHENBURG,SWEDEN

[3] UNIV MAINZ,INST KERNCHEM,D-55099 MAINZ,GERMANY

[4] CSIC,INST ESTRUCTURA MAT,E-28006 MADRID,SPAIN

[5] IV KURCHATOV ATOM ENERGY INST,INST GEN & NUCL PHYS,RUSSIAN SCI CTR,MOSCOW 123182,RUSSIA

[6] UNIV FRANKFURT,INST KERNPHYS,D-60486 FRANKFURT,GERMANY

[7] INST PHYS NUCL,F-91406 ORSAY,FRANCE

[8] MICHIGAN STATE UNIV,NATL SUPERCOND CYCLOTRON LAB,E LANSING,MI 48824

[9] MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824

[10] JAGIELLONIAN UNIV,INST FIZYKI,PL-30059 KRAKOW,POLAND

[11] UNIV GIESSEN,INST THEORET PHYS,D-35391 GIESSEN,GERMANY

[12] AARHUS UNIV,INST FYS & ASTRON,DK-8000 AARHUS C,DENMARK

[13] CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND

来源：

NUCLEAR PHYSICS A | 1997年 / 619卷 / 1-2期

关键词：

NUCLEAR REACTIONS C; Pb(Li-11; chi n); E=280; MeV/nucleon; measured neutron multiplicity; breakup sigma; Li-11; Li-10 deduced resonances; decay features; gamma-decay associated sum-rule strengths;

D O I：

10.1016/S0375-9474(97)00134-6

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：

Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises similar to 8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wave neutron decay. A strong di-neutron correlation in Li-11 can be discarded. Calculations in a quasi-particle RPA approach are compared with the experimental results for Li-10 and Li-11. (C) 1997 Elsevier Science B.V.

引用

页码：151 / 176

页数：26

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