<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math>-decay half-lives and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math>-delayed neutron multiplicities of the neutron drip-line nuclei <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>19</mn></mrow></msup></mrow><mi mathvariant="normal">B</mi><mo>,</mo><mrow><msup><mrow><mi></mi></mrow><mrow><mn>22</mn></mrow></msup></mrow><mi mathvariant="normal">C</mi><mo>,</mo></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>23</mn></mrow></msup></mrow><mi mathvariant="normal">N</mi></math>

K. Yoneda; N. Aoi; H. Iwasaki; H. Sakurai; H. Ogawa; T. Nakamura; W.-D. Schmidt-Ott; M. Schäfer; M. Notani; N. Fukuda; E. Ideguchi; T. Kishida; S. S. Yamamoto; M. Ishihara

doi:10.1103/PhysRevC.67.014316

$β$ -decay half-lives and $β$ -delayed neutron multiplicities of the neutron drip-line nuclei $^{19} B,^{22} C,$ and $^{23} N$

K. Yoneda, N. Aoi, H. Iwasaki, H. Sakurai, H. Ogawa, T. Nakamura, W.-D. Schmidt-Ott, M. Schäfer, M. Notani, N. Fukuda, E. Ideguchi, T. Kishida, S. S. Yamamoto, and M. Ishihara

Phys. Rev. C 67, 014316 – Published 27 January 2003

Abstract

Beta-decay properties of the neutron drip-line nuclei $^{19} B,^{22} C,$ and $^{23} N$ have been studied using projectile fragments from 95 MeV/nucleon $^{40} Ar$ ions incident on a $^{nat} Ta$ target. The $β$ -decay half-lives of $^{22} C$ and $^{23} N$ have been determined for the first time to be ${6.1}_{- 1.2}^{+ 1.4}$ and ${14.1}_{- 1.5}^{+ 1.2}$ ms, respectively. The half-life of $^{19} B$ was reinvestigated, resulting in a new value of $2.92 \pm 0.13$ ms. The $β$ -delayed neutron multiplicities have also been determined to be $P_{1 n} {= 71.8}_{- 9.1}^{+ 8.3} %, P_{2 n} {= 16.0}_{- 4.8}^{+ 5.6} %$ for $^{19} B, P_{1 n} {= 61}_{- 13}^{+ 14} %$ for $^{22} C,$ and $P_{1 n} {= 42.2}_{- 6.5}^{+ 6.3} %, P_{2 n} {= 8.0}_{- 3.4}^{+ 3.8} %$ for $^{23} N .$ The results are compared with theoretical predictions.

Received 9 August 2002

DOI:https://doi.org/10.1103/PhysRevC.67.014316

Authors & Affiliations

K. Yoneda^1,*, N. Aoi¹, H. Iwasaki¹, H. Sakurai², H. Ogawa³, T. Nakamura¹, W.-D. Schmidt-Ott⁴, M. Schäfer⁴, M. Notani², N. Fukuda¹, E. Ideguchi², T. Kishida², S. S. Yamamoto⁵, and M. Ishihara^1,2

¹Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
²RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
³Department of Physics, Tokyo Institute of Technology, Oh-Okayama 2-12-1, Meguro-ku, Tokyo 152-8551, Japan
⁴Zweites Physikalisches Institut der Universität Göttingen, Bunsenstrasse. 7-9, D-37037 Göttingen, Germany
⁵Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-0094, Japan

^*Present address: RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan. Electronic address: yoneda@rarfaxp.riken.go.jp

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Vol. 67, Iss. 1 — January 2003

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