β-decay half-lives of very neutron-rich isotopes of elements from Ti to Ni

被引:76
作者
Ameil, F
Bernas, M
Armbruster, P
Czajkowski, S
Dessagne, P
Geissel, H
Hanelt, E
Kozhuharov, C
Miehe, C
Donzaud, C
Grewe, A
Heinz, A
Janas, Z
de Jong, M
Schwab, W
Steinhauser, S
机构
[1] Inst Phys Nucl, IN2P3, CNRS, F-91406 Orsay, France
[2] Gesell Schwerionenforsch GmbH, D-64220 Darmstadt, Germany
[3] CEN Bordeaux Gradignan, IN2P3, CNRS, F-33175 Gradignan, France
[4] Inst Rech Subatom, IN2P3, CNRS, F-67037 Strasbourg 2, France
[5] TH Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany
[6] Univ Warsaw, Inst Fiz Doswiadczalnej, PL-00681 Warsaw, Poland
关键词
D O I
10.1007/s100500050062
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 unknown beta-decay half-lives of 22 isotopes far off stability (5 < T-z < 10) in the region from Ti to Ni were measured at GSI, Darmstadt. The nuclei were produced in a fragmentation reaction of 500 A.MeV Kr-86-projectile impinging on a thick Be target. The isotopes of interest mere separated and identified with the fragment separator, FRS, by a combination of B rho, Z, and ToF techniques. An additional range separation was performed by a selective implantation into granular detectors. The spatial and time correlations of the implant with the consecutively detected beta-particles were used to determine the unknown half-lives. For nuclei far off stability, beta-decay chains were measured and analyzed as well, leading to an even more reliable evaluation of the lifetimes. The large discrepancies found between the measured and the theoretical values emphasize that most recent theoretical work is not an improvement over calculations made almost a decade ago.
引用
收藏
页码:275 / 283
页数:9
相关论文
共 30 条
[1]  
Ameil F., 1997, IPNOT9702
[2]  
AUDI G, 1993, NUCL PHYS A, V565
[3]   DISCOVERY OF RARE NEUTRON-RICH ZR, NB, MO, TC, AND RU ISOTOPES IN FISSION - TEST OF BETA-HALF-LIFE PREDICTIONS VERY FAR FROM STABILITY [J].
AYSTO, J ;
ASTIER, A ;
ENQVIST, T ;
ESKOLA, K ;
JANAS, Z ;
JOKINEN, A ;
KRATZ, KL ;
LEINO, M ;
PENTTILA, H ;
PFEIFFER, B ;
ZYLICZ, J .
PHYSICAL REVIEW LETTERS, 1992, 69 (08) :1167-1170
[4]   BETA-DECAY HALF-LIVES OF NEUTRON RICH CU AND NI ISOTOPES PRODUCED BY THERMAL FISSION OF U-235 AND PU-239 [J].
BERNAS, M ;
ARMBRUSTER, P ;
BOCQUET, JP ;
BRISSOT, R ;
FAUST, H ;
KOZHUHAROV, C ;
SIDA, JL .
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 1990, 336 (01) :41-51
[5]  
Bernas M, 1997, NUCL PHYS A, V616, pC352, DOI 10.1016/S0375-9474(97)00109-7
[6]   SYNTHESIS OF THE ELEMENTS IN STARS [J].
BURBIDGE, EM ;
BURBIDGE, GR ;
FOWLER, WA ;
HOYLE, F .
REVIEWS OF MODERN PHYSICS, 1957, 29 (04) :547-650
[7]   SEPARATION AND IMPLANTATION OF RELATIVISTIC KR-86-FRAGMENTS AT THE FRS - HALF-LIFE MEASUREMENT BY ION-BETA TIME-CORRELATIONS [J].
CZAJKOWSKI, S ;
BERNAS, M ;
ARMBRUSTER, P ;
GEISSEL, H ;
KOZHUHAROV, C ;
MUNZENBERG, G ;
VIEIRA, D ;
DESSAGNE, P ;
MIEHE, C ;
HANELT, E ;
AUDI, G ;
LEE, JKP .
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 1994, 348 (04) :267-272
[8]  
Czajkowski S., 1992, IPNOT9202
[9]  
DOBACZEWSKI J, 1994, WORKSH NUCL FISS FIS
[10]   THE GSI PROJECTILE FRAGMENT SEPARATOR (FRS) - A VERSATILE MAGNETIC SYSTEM FOR RELATIVISTIC HEAVY-IONS [J].
GEISSEL, H ;
ARMBRUSTER, P ;
BEHR, KH ;
BRUNLE, A ;
BURKARD, K ;
CHEN, M ;
FOLGER, H ;
FRANCZAK, B ;
KELLER, H ;
KLEPPER, O ;
LANGENBECK, B ;
NICKEL, F ;
PFENG, E ;
PFUTZNER, M ;
ROECKL, E ;
RYKACZEWSKI, K ;
SCHALL, I ;
SCHARDT, D ;
SCHEIDENBERGER, C ;
SCHMIDT, KH ;
SCHROTER, A ;
SCHWAB, T ;
SUMMERER, K ;
WEBER, M ;
MUNZENBERG, G ;
BROHM, T ;
CLERC, HG ;
FAUERBACH, M ;
GAIMARD, JJ ;
GREWE, A ;
HANELT, E ;
KNODLER, B ;
STEINER, M ;
VOSS, B ;
WECKENMANN, J ;
ZIEGLER, C ;
MAGEL, A ;
WOLLNIK, H ;
DUFOUR, JP ;
FUJITA, Y ;
VIEIRA, DJ ;
SHERRILL, B .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1992, 70 (1-4) :286-297