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Curtin, Maurice; Harwood, L. H.; Nolen, J.A.; Sherrill, B. M.; Xie, Zhaoxuan; Brown, B. A.

doi:10.1103/physrevlett.56.34

Cited by 40 publications

(7 citation statements)

References 11 publications

(7 reference statements)

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“…Agreement between present values and earlier reported half-lives is observed for 19N and 34A1. Our result for 15B is in accordance with [14] and somewhat larger than another reported value [15], however, a reevaluation of the latter data [16] yielded a result being in the lines with the present one.…”

Section: Ill Results and Discussionsupporting

confidence: 92%

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?-Delayed neutron emission of15B,18C,19,20N,34,35Al and39P

Mueller

Bazin

Schmidt-Ott

et al. 1988

Z. Physik A - Atomic Nuclei

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The isotopes 15B, ~sC, 19'2~ 34'35A1 and 39p have been produced as projectile-like fragments from the interaction of a S6Kr beam of 45 MeV/u from GANIL with a lS~Ta target. Separated by the 0 ~ magnetic analyser LISE, the nuclei are identified by means of a AE-E semiconductor telescope. It is surrounded, in a geometry close to 4re, by a thin plastic scintillator (NE 102) and a large volume liquid scintillator (NE 213) for the detection of betas and neutrons, respectively, from the decay of the implanted nuclei.By observation of the/%delayed neutrons, the half-lives T1/2 and neutron emission probabilities P, have been measured. The T1/2 of lsC, ~~ 35A1, 39p and P, of tsC, 19'2~ 34'35A1 and 39p are determined for the first time. For the isotopes 17C, 36'37Si and 38p upper limits of P, are deduced.

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Section: Ill Results and Discussionsupporting

confidence: 92%

“…Other experimental results: ~ [14]; f [15]; g [16]; h [42 half-life, number of emitting nuclei and background, was found to be around 2 Zmln -~ 1 when allowing only for statistical error of the observed count rates. These calculations were made with the help of the FOR-TRAN code MINUIT [13].…”

Section: Ill Results and Discussionmentioning

confidence: 96%

?-Delayed neutron emission of15B,18C,19,20N,34,35Al and39P

Mueller

Bazin

Schmidt-Ott

et al. 1988

Z. Physik A - Atomic Nuclei

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“…A half-life measurement of the ß-decay gave a preliminary value of 0.4(2)s. The high forward momentum of such relativistic heavy ion fragmentation reactions, combined with the use of secondary beams, opens a way for systematic decay studies of very neutron-rich isotopes and may possibly lead us to the neutron drip line. This has been convincingly demonstrated at the GANIL [35] and MSU [36] cyclotrons where large numbers of neutron-rich isotopes with Ζ = 5-20 have been produced by Ar and Kr fragmentation at intermediate energies. Figure 1, chap.…”

Section: Heavy Ion Fragmentation Reactionsmentioning

confidence: 76%

“…Consistency of lifetimes in36 C1 measured with the GRID method in the four alkali halide targets indicated[160].…”

mentioning

confidence: 99%

12 The Measurement of Nuclear Lifetimes

1997

Experimental Techniques in Nuclear Physics

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Table of Contents I. Scope and definitions 425 II. Decay constants of "rare" decays 427 A. Very long lifetimes 427 B. Very small activities 428 C. Precision studies of the neutron lifetime 434 III. Direct timing methods (10~6 > τ > 10" 15 s) 437 A. Electronic and pulsed beam timing methods 437 B. Recoil shadow timing methods 445 C. The recoil distance "plunger" method 447 D. The Doppler shift attenuation method 453 E. The GRID method 466 IV. Measurement of very short lifetimes (τ < 10" 15 s) 472 A. X-ray timing 473 B. Crystal blocking 474 C. Nuclear resonance fluorescence 475 D. Determination of narrow resonance widths 478 References 482 I. Scope and definitionsThe decay modes of ground states and the low-lying nuclear states up to about 10 MeV excitation energy via ß-decay, electromagnetic radiations, particle emission and/or fission have been extensively studied for many decades. In all domains of nuclear structure investigations, the measurement of absolute decay probabilities and nuclear lifetimes has given important insight into the facets of nuclear many-body systems and has provided detailed data for in-depth tests of nuclear models. Some of these decay modes involve fundamentally known interactions, e.g. the electro-weak interaction in the case of β-and γ-decay processes, and thus are directly sensitive to the nuclear model wave functions to be tested. Other processes like nucleon emission, α-decay and fission are more difficult to deal with theoretically, as here the wave functions of the nuclear states involved in the transition and the nuclear transition operator, which both determine the decay probabilities, depend on the model used.The experimentally accessible range of nuclear lifetimes covers more than forty-five (!) orders of magnitude. When just considering α-decays, we have, on the one hand, the Unauthenticated Download Date | 6/13/16 9:10 AM

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“…Warburton and Millener [23] showed that the analysis of the -ray spectra following ¬-decay of this isotope seems to exclude 5/2 · as ground state. A comparison of the measured ¬-decay half-life of this isotope [24] with the theoretical prediction for a Gamow-Teller ¬-decay, however, allows both 3/2 or 5/2 as ground state spin. It may be interesting to notice that though the neutron separation energy is smaller than in the case of ½ C, relatively a broad momentum distribution (141¦ MeV/c) of the fragment ( ½ C) was observed in one neutron knockout reactions [2,3].…”

Section: Direct Breakup Of ½ ½ Cmentioning

confidence: 84%

Structure of light neutron-rich nuclei through coulomb dissociation

et al. 2001

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Coulomb breakup of neutron-rich nuclei around mass ¾¼ has been studied experimentally using secondary beams ( 500-600 MeV/u) of unstable nuclei produced at GSI. The spectroscopic factor deduced for the neutron occupying × ½ ¾ level in ½ C ground state is consistent with the earlier reported value. The data analysis for Coulomb breakup of ½ C shows that most of the cross section yields the ½ C core in its excited state. For ½ ¾¾ O, the low-lying E1 strength amounts up to about 12± of the energy weighted dipole sum rule strength depending on neutron excess. The cluster sum rule limit with ½ O as a core is almost exhausted for ½ ½ O, while for more neutron rich isotopes the strength with respect to that limit decreases.

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Lifetime measurements of neutron-rich light isotopesBe14andC

Cited by 40 publications

References 11 publications

?-Delayed neutron emission of15B,18C,19,20N,34,35Al and39P

?-Delayed neutron emission of15B,18C,19,20N,34,35Al and39P

12 The Measurement of Nuclear Lifetimes

Structure of light neutron-rich nuclei through coulomb dissociation

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